CN107147404B - A kind of antenna switchgear and terminal - Google Patents
A kind of antenna switchgear and terminal Download PDFInfo
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- CN107147404B CN107147404B CN201710500340.4A CN201710500340A CN107147404B CN 107147404 B CN107147404 B CN 107147404B CN 201710500340 A CN201710500340 A CN 201710500340A CN 107147404 B CN107147404 B CN 107147404B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/74—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of diodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present embodiments relate to wireless communication technology field, a kind of antenna switchgear and its terminal are disclosed.The antenna switchgear, comprising switching circuit at least all the way, the switching circuit includes: the first match circuit, the second match circuit, first capacitor element, the second capacity cell, the first gating element, the second gating element, the first control transmission circuit and the second control transmission circuit；Wherein, when the first end of the first control transmission circuit receives first control signal, first gating element is in the conductive state under the control of the first control signal, when the first end of the second control transmission circuit receives second control signal, the second gating element according to the second control signal is in off state.In the present invention, improve terminal antenna switching circuit flexibility ratio simultaneously, guarantee that the performance of duplexer is more preferable.
Description
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to an antenna switching device and a terminal.
Background
In wireless communication, an antenna switch is a switch for switching the working state of an antenna, and is connected between an electric wire and a radio frequency Processing circuit, the switching of the antenna switch is controlled by a Central Processing Unit (CPU), and the antenna switch is used for increasing the working bandwidth of the antenna. In the terminal design, because the antenna switch is a radio frequency front-end device, the antenna switch directly influences the transceiving capacity of a mobile phone signal and the appearance of the whole terminal, and simultaneously needs to be compatible with a plurality of working modes to cover more than 40 communication frequency bands, so the design of the terminal antenna switch circuit is a key link in the whole terminal design process.
The inventor discovers that in the process of implementing the invention: in the prior art, the terminal antenna switch mostly adopts a specially designed integrated switch with a plurality of ports, and the ports respectively correspond to different channels to realize the function of the multi-channel switch, but the multi-port integrated switch has low flexibility, cannot be matched and replaced according to the number of switch channels required by the antenna, and can also cause waste when the antenna does not use so many ports. In some specially designed antenna switch circuits, when the switch element is in an off state, the equivalent capacitance of the off switch element and the matching circuit will form resonance, thereby affecting the antenna performance, and further shortening the communication distance of the terminal, reducing the transmission rate, deteriorating the communication quality, etc.
Therefore, in the design of the terminal antenna switch circuit, on the basis of well matching the number of switch channels, it is the focus of the technicians in the field how to improve the flexibility of the antenna switch circuit and ensure the good performance of the antenna.
Disclosure of Invention
An object of embodiments of the present invention is to provide an antenna switch apparatus and a terminal thereof, which can improve the flexibility of a terminal antenna switch circuit and ensure better performance of an antenna switch.
In order to solve the above technical problem, an embodiment of the present invention provides an antenna switching apparatus, including at least one switching circuit, where the switching circuit includes: a first matching circuit, a second matching circuit, a first capacitive element, a second capacitive element, a first gating element, a second gating element, a first control transmission circuit, and a second control transmission circuit;
the first end of the first control transmission circuit is used for receiving a first control signal, the second end of the first control transmission circuit is connected with the positive electrode of the first gating element and the first connecting end of the first capacitance element, the second connection end of the first capacitor element is respectively connected with the first end of the first matching circuit and the first feed point of the feed part of the antenna, the second end of the first matching circuit is grounded, the negative pole of the first gating element is connected with the first end of the second matching circuit and the first connecting end of the second capacitance element, the second end of the second matching circuit is grounded, the first end of the second control transmission circuit is used for receiving a second control signal, a second connection end of the second capacitor element is connected with the anode of the second gating element and the second end of the second control transmission circuit, and the cathode of the second gating element is grounded;
when the first end of the first control transmission circuit receives a first control signal, the first gating element is in a conducting state according to the first control signal, and when the first end of the second control transmission circuit receives a second control signal, the second gating element is in a stopping state according to the second control signal;
or when the first end of the first control transmission circuit receives a first control signal, the first gating element is in a cut-off state according to the first control signal, and when the first end of the second control transmission circuit receives a second control signal, the second gating element is in a conducting state according to the second control signal.
An embodiment of the present invention further provides a terminal, including: the antenna switching device, the processor, the radio frequency circuit, the radio frequency transmission circuit and the antenna provided by the embodiment of the invention;
the processor is used for sending the control signal, the processor is electrically connected with the first end of the first control transmission circuit, and the processor is electrically connected with the first end of the second control transmission circuit;
the output end of the radio frequency circuit is connected with the first end of the radio frequency transmission circuit, and the radio frequency circuit sends out a radio frequency signal;
the antenna comprises an antenna body, a ground feeding part and a feeding part, wherein the feeding part of the antenna at least comprises a first feed point and a second feed point, the first feed point is connected with a second connecting end of the first capacitor element in the antenna switch device, the second feed point is connected with a second end of the radio frequency transmission circuit, the ground feeding part comprises a third feed point, and the third feed point is connected with a grounding end and used for grounding the antenna.
Compared with the prior art, the implementation mode of the invention comprises two control transmission circuits in one switching circuit, wherein the control transmission circuit receives control signals, and the control transmission circuit in one path is connected with the switching channel in one path, wherein the switching channel is a channel for sending the control signals by a processor, the implementation mode can set a corresponding number of control transmission circuits according to the number of the switching channels of the processor, so that the antenna can be connected with a certain number of switching circuits according to the number of the control transmission circuits, thereby ensuring the flexibility of the antenna switch, wherein the first control transmission circuit receives a first control signal, the second control transmission circuit receives a second control signal, the two control signals respectively control the conduction and the cut-off of the first gating element and the second gating element, so that different matching circuits are connected into the circuits, thereby ensuring the working frequency and the stable state of the antenna, therefore, the implementation mode can improve the performance of the antenna, avoid the influence of resonance generated by equivalent capacitance and a corresponding matching circuit formed when the gating element is cut off on antenna signals, and ensure that the antenna stably transmits and receives radio frequency signals. The antenna is simple to operate and low in cost, corresponding gating elements and control transmission circuits can be arranged according to the requirements of control signals, the circuit design structure is more flexible, one switch circuit is controlled by two control signals to improve the performance of the antenna, and the antenna can stably work in different communication frequency bands.
In addition, in at least one switching circuit, the first gating element and the second gating element are PIN diodes. In the embodiment, the selected device is a PIN diode, the PIN diode mainly comprises a layer of intrinsic body, and when a gating element is applied with negative voltage (or zero bias), the PIN diode is equivalently formed by connecting a capacitor and a resistor in series; when a positive voltage is applied, the PIN diode is equivalent to a small resistance. Therefore, the control signal controls the on and off of the gating element, so that the structure of the circuit is different to adapt to different frequencies.
In addition, in at least one of the switch circuits, the first control transmission circuit includes: a first resistive element, a third capacitive element, and a first inductive element;
the first connection end of the first resistance element is used for receiving a first control signal for the first end of the first control transmission circuit, the second connection end of the first resistance element is connected with the first connection end of the third capacitance element and the first connection end of the first inductance element, the second connection end of the third capacitance element is grounded, and the second connection end of the first inductance element is used for the second end of the first control transmission circuit.
In addition, in at least one of the switch circuits, the second control transmission circuit includes: a second resistive element, a fourth capacitive element, and a second inductive element; the first connection end of the second resistance element is the first end of the second control transmission circuit for receiving a second control signal, the second connection end of the second resistance element is connected with the first connection end of the fourth capacitance element and the first connection end of the second inductance element, the second connection end of the fourth capacitance element is grounded, and the second connection end of the second inductance element is the second end of the second control transmission circuit.
In this embodiment, the first control transmission circuit and the second control transmission circuit are identical in structure and device, wherein, the first resistance element and the second resistance element are used for limiting current, the current values of the control signals of the first gating element and the second gating element are ensured to be in a certain range, the third capacitance element and the fourth capacitance element are used for filtering, the first inductance element and the second inductance element are used for isolating high-frequency signals, and the interference of the high-frequency signals to the processor through the first control transmission circuit and the second control transmission circuit is avoided, therefore, the first control transmission circuit controls the value of the first control signal current according to the specification of the first gating element, the second control transmission circuit controls the value of the second control signal current according to the specification of the second gating element, meanwhile, the interference of high-frequency signals in the circuit with the processor through the first control transmission circuit and the second control transmission circuit is avoided. The switch circuit of one path comprises two control transmission circuits, so that the antenna switch circuit can be adjusted according to the port number of the processor, and the circuit structure is more flexible.
In addition, in at least one path of the switching circuit, the first matching circuit includes a second inductance element; the first connection end of the second inductance element is the first end of the first matching circuit, and the second connection end of the second inductance element is the second end of the first matching circuit. In this embodiment, the first matching circuit includes an inductive element for preventing the high rf signal from being directly grounded, and protecting the antenna from normally transmitting signals.
In addition, in the at least one switching circuit, the second matching circuit includes: a third inductive element and a fourth capacitive element; the fourth capacitive element and the third inductive element are connected in parallel, a first connection end of the third inductive element and a first connection end of the fourth capacitive element are connected and serve as a first end of a second matching circuit, and a second connection end of the third inductive element and a second connection end of the fourth capacitive element are connected and serve as a second end of the second matching circuit;
or,
the second matching circuit includes, a third inductive element; the first connection end of the third inductive element is the first end of the second matching circuit, and the second connection end of the third inductive element is the second end of the second matching circuit.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a circuit diagram of a switch circuit according to a first embodiment of the present invention;
fig. 2 is a circuit diagram illustrating an operating state of an antenna according to the first embodiment of the present invention;
FIG. 3 is a connection diagram of a specific switching circuit in a second embodiment of the present invention;
fig. 4 is a circuit diagram of an antenna switch with only one diode according to a second embodiment of the present invention;
fig. 5 is a connection diagram of a circuit configuration of a terminal in a third embodiment of the present invention;
fig. 6 is a specific circuit connection diagram of a terminal circuit diagram in a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to an antenna switching device including at least one switching circuit, as shown in fig. 1, including a first matching circuit 101, a second matching circuit 102, a first capacitive element 103, a second capacitive element 104, a first gate element 105, a second gate element 106, a first control transmission circuit 107, and a second control transmission circuit 108;
a first end of the first control transmission circuit 107 is configured to receive a first control signal, a second end of the first control transmission circuit 107 is connected to an anode of the first gating element 105 and a first connection end of the first capacitor element 103, a second connection end of the first capacitor element 103 is connected to a first end of the first matching circuit 101 and a first feed point of a feed portion of the antenna, respectively, a second end of the first matching circuit 101 is grounded, a cathode of the first gating element 105 is connected to a first end of the second matching circuit 102 and a first connection end of the second capacitor element 104, a second end of the second matching circuit 102 is grounded, a first end of the second control transmission circuit is configured to receive a second control signal, a second connection end of the second capacitor element 104 is connected to an anode of the second gating element 106 and a second end of the second control transmission circuit 108, and a cathode of the second gating element 106 is grounded;
wherein, the first terminal of the first control transmission circuit 107 receives the first control signal and transmits the first control signal to the first gating element 105, the first gating element 105 is turned on according to the signal transmitted by the first control transmission circuit, the first terminal of the second control transmission circuit 108 receives the second control signal and transmits the second control signal to the second gating element 106, the second gating element 106 is turned off according to the signal transmitted by the second control transmission circuit;
alternatively, the first terminal of the first control transmission circuit 107 receives the first control signal and transmits the first control signal to the first gate element 105, the first gate element 105 is turned off according to the signal transmitted by the first control transmission circuit, the first terminal of the second control transmission circuit 108 receives the second control signal and transmits the second control signal to the second gate element 106, and the second gate element 106 is turned on according to the signal transmitted by the second control transmission circuit.
Specifically, in one particular implementation, the first control signal causes the first gating element 105 to be in an off state, and the second control signal causes the second gating element 106 to be in an on state; the first control signal causes the first gating element 105 to be in an on state, the second control signal causes the second gating element 106 to be in an off state, and the second matching circuit 102 and the first gating circuit access circuit.
In the prior art, as shown in fig. 2, a high-frequency signal is transmitted to an antenna feed point ANT12 through matching circuits R17, C13, and C19 (ANT represents an antenna hardware interface for connecting an antenna); the other feed point ANT11 of the antenna is connected to the antenna switching circuit; the ANT11 is connected to a different matching device or not connected to the matching device by controlling the turning on and off of PIN diodes in the antenna switching circuit, such as D11 and D12 in fig. 2.
The working principle of the circuit of fig. 2 is as follows: when the terminal works in a certain frequency band, according to a scheme preset in software, the CNT1 and the CNT2(CNT represents a control signal sent by a processor) send corresponding control combinations; the control level of the CNT1 and the CNT2 may be any one of low level and low level, low level and high level, high level and low level, and high level (the antenna switch switching scheme preset by software is determined at the time of antenna debugging). Taking the control levels of the CNT1 and the CNT2 as a low level and a high level as an example, the CNT1 is at a low level at this time, and therefore the CNT1 does not supply a bias current to the corresponding PIN diode D11, and the D11 is in an off state, and the matching device C12 is disconnected from the antenna circuit; since the CNT2 is at a high level and the D12 is in a forward conducting state, the CNT2 forms a direct current path through the R18, the L15, the D12, and the L13, and the matching device C18 is connected to the antenna circuit. There are 4 matching states as follows: when the control levels of the CNT1 and the CNT2 are low level and low level, the antenna pin ANT11 is floating; when the control levels of the CNT1 and the CNT2 are low level and high level, the C18 is connected to the ANT 11; when the control levels of the CNT1 and the CNT2 are high level and low level, the C12 is connected to the ANT 11; when the control levels of the CNT1 and the CNT2 are high and high, C12 and C18 are both connected to ANT11, which is equivalent to C12 connected in parallel to C18. Because the ANT11 is connected to different matching devices, the resonant frequency of the antenna changes, so the working frequency range of the antenna can be dynamically adjusted under the control of the processor.
In a specific implementation according to this embodiment, in the antenna switching circuit, the first control signal makes the first gating element 105 in a conducting state, and the second control signal makes the second gating element 106 in a conducting state; the first control signal causes the first gating element 105 to be in an off state, and the second control signal causes the second gating element 106 to be in an on state; the first control signal causes the first gating element 105 to be in an on state, and the second control signal causes the second gating element 106 to be in an off state; the first control signal causes the first gating element 105 to be in an off state, and the second control signal causes the second gating element 106 to be in an off state; the two gating elements of one antenna switching circuit are used in a matched mode, so that the antenna is controlled more flexibly, and the antenna is in different working frequency bands in various combination states.
Compared with the prior art, the switching circuit of one path comprises two gating elements, the control signals of the two paths respectively control the on-off states of the gating elements, the resonance frequency possibly formed between an equivalent capacitor formed when the gating elements are off and a corresponding matching circuit can be prevented from falling in a working frequency band, the antenna can be ensured to stably send and receive signals in multiple frequency bands, and the performance of the antenna is improved.
A second embodiment of the present invention relates to an antenna switching device. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: in the second embodiment, the antenna switching device is described by taking a specific circuit diagram as an example, and as shown in fig. 3, specifically, the first control transmission circuit 107 includes a first resistance element R1, a third capacitance element C3, and a first inductance element L1; the second control transmission circuit 108 includes a second resistance element R2, a fourth capacitance element C4, and a second inductance element L2; the first matching circuit 101 includes a third inductive element L3, and the second matching circuit 102 includes a fourth inductive element L4 and a fifth capacitive element C5.
A first connection end of the first resistance element R1 is a first end of the first control transmission circuit 107 and is configured to receive a first control signal, a second connection end of the first resistance element R1 is connected to the first connection end of the third capacitance element C3 and the first connection end of the first inductance element L1, a second connection end of the third capacitance element C3 is grounded, and a second connection end of the first inductance element L1 is a second end of the first control transmission circuit 107; a first connection end of the second resistance element R2 is a first end of the second control transmission circuit 108 and is configured to receive a second control signal, a second connection end of the second resistance element R2 is connected to the first connection end of the fourth capacitance element C4 and the first connection end of the second inductance element L2, a second connection end of the fourth capacitance element C4 is grounded, and a second connection end of the second inductance element L2 is a second end of the second control transmission circuit 108; the first connection end of the third inductive element L3 is the first end of the first matching circuit 101, and the second connection end of the third inductive element L3 is the second end of the first matching circuit 101; the fifth capacitive element C5 and the fourth capacitive element L4 are connected in parallel, the first connection terminal of the fourth inductive element L4 and the first connection terminal of the fifth capacitive element C5 are connected and serve as the first terminal of the second matching circuit 102, and the second connection terminal of the fourth inductive element L4 and the second connection terminal of the fifth capacitive element C5 are connected and serve as the second terminal of the second matching circuit 102.
Further, the circuit connection relationship of the specific first matching circuit 101, second matching circuit 102, first capacitive element 103, second capacitive element 104, first gate element 105, second gate element 106, first control transmission circuit 107, and second control transmission circuit 108 is not changed, where the first capacitive element 103 is represented by C1, the second capacitive element 104 is represented by C2, the first gate element 105 is represented by D1, and the second gate element 106 is represented by D2.
Specifically, the third capacitive element C3, the fourth capacitive element C4, the first inductive element L1, and the second inductive element L2 are used for isolating high-frequency signals, preventing the high-frequency signals from leaking to an external circuit, and preventing the high-frequency signals from interfering with a control device, and the values of the three are related to the operating frequency of the antenna switch, and the specific values are based on the value of actual antenna debugging. A first capacitive element C1 and a second capacitive element C2 for isolating the dc bias of D1 from D2, whose value is related to the antenna switch operating frequency; in a specific implementation, for an LTE (Long term evolution) terminal, an optional value is usually tens of picofarads, such as 56PF (picofarads), which is only an example here, and a specific value is based on a value of actual antenna tuning. The first resistor element R1 and the second resistor element R2 are dc bias resistors for adjusting the current of the control signal, and are usually selected from several tens to several thousands of ohms according to different specifications of the PIN diode and the magnitude of the control voltage, and the value thereof is determined by the on-state characteristic of the PIN diode and the maximum output capacity of the control circuit, and in one specific implementation, when the control voltage is 1.8V, PIN, the diode bias current is 10mA (milliampere), R2 (assuming that the forward on-state voltage of the PIN diode is 0.7V), which is expressed as (1.8-0.7)/0.01 ═ 110Ohm (ohms).
Specifically, the first gating element 105 and the second gating element 106 are PIN diodes, and when a positive voltage is applied to the PIN diodes, the PIN diodes are equivalent to small resistors; when a negative voltage (or zero bias voltage) is applied, the PIN tube is equivalent to a capacitor and a resistor which are connected in series. Therefore, when the device is actually selected, a proper device is actually selected during antenna debugging according to the working frequency of the antenna, the resistance of the PIN diode when the PIN diode is conducted and the value of the maximum bearable reverse bias voltage of the PIN diode.
Specifically, the first control signal and the second control signal are control signals sent by the processor and control the on and off of the PIN diode. When the antenna switch is in a working state, the control levels of the first control signal and the second control signal are opposite, when the first control signal is at a high level, the second control signal is at a low level, at the moment, D1 is switched on, D2 is switched off, and the second matching circuit access circuit ensures that the antenna works at a corresponding frequency; when the first control signal is at a low level, the second control signal is at a high level, at this time, D1 is turned off, D2 is turned on, and the first matching circuit access circuit ensures that the antenna stably operates in the corresponding frequency band.
In the prior art, there is an embodiment with only one diode, if a PIN diode is used as the antenna high-frequency switch circuit, as shown in fig. 4, when the switch diode is in the off state, the equivalent capacitance of the diode cut-off is about less than 1PF, such as 0.3 PF; c4 is a matching device, if the matching device C4 is an inductor, then L3 is not needed, and at this time, the PIN diode equivalent capacitance and C4 will form a series resonant circuit, and then the resonant frequency of the circuit is expressed as:
in the formula, f represents a resonance frequency, C represents a capacitance value of an equivalent capacitor when the PIN diode is turned off, and C4 represents an inductance value of the inductance element.
In the above conventional implementation, when C is 0.3PF and C4 is 15nH (nanohenry), the resonant frequency f of both is 2.38GHz (gigahertz), which falls within the frequency band of LTE B40. The performance of the antenna in the 2.38GHz band is greatly affected at this time. The effect of sending and receiving signals by the terminal in the frequency band is poor, so that the communication distance and the communication transmission rate of the terminal are affected, and the poor performance of the antenna in the mobile phone in the frequency band can cause the poor communication quality.
In order to avoid the situation that the resonance affects the performance of the antenna when only one diode is provided, in this embodiment, two gating elements are provided, when the first gating element 105 is in an off state, the second gating element 106 is in an on state, a branch where the second gating element 106 is located is a circuit path at this time, and the second matching circuit 102 is short-circuited, so that the situation that the resonance is formed between the second matching circuit 102 and the first conducting element 105 in the off state to affect the performance of the antenna when the second matching circuit 102 is an inductance element is avoided, and then the second conducting element 106 in this embodiment can eliminate or remove a resonance point, which is beneficial for the antenna to operate in multiple frequency bands. Compared with the prior art, the two PIN diodes are arranged in the implementation mode, so that the problem that when the antenna works in some frequency bands, the performance of the antenna is affected due to the fact that the cut-off equivalent capacitance and the matching inductance of the diodes form resonance, and the using effect of the terminal is further affected is avoided.
A third embodiment of the present invention relates to a terminal, as shown in fig. 5, including: an antenna switching device 501, a processor 502, a radio frequency circuit 503, a radio frequency transmission circuit 504, and an antenna 505;
wherein, the processor 502 is configured to send out a control signal; the radio frequency circuit 503 sends out a radio frequency signal; the antenna 505 includes an antenna body, a ground feeding portion and a feeding portion, wherein the feeding portion of the antenna 505 at least includes a first feed point and a second feed point, the first feed point is connected to the second connection end of the first capacitive element in the antenna switch device, the second feed point is connected to the second end of the radio frequency transmission circuit 504, the ground feeding portion includes a third feed point, and the third feed point is connected to the ground terminal and is used for grounding the antenna.
Specifically, the processor 502 is electrically connected to a first end of a first control transmission circuit of the antenna switch device 501, and the processor 502 is electrically connected to a first end of a second control transmission circuit of the antenna switch device 501. The processor 502 sends out control information to control the state of the diode, so that the resonant frequency of the antenna is different, and the adjustment of the working frequency band of the antenna can be realized.
Specifically, the output end of the rf circuit 503 is connected to the first end of the rf transmission circuit 504, and the second end of the rf transmission circuit 504 is connected to the second feed point of the antenna 505. The rf transmission circuit 504 is connected to the second feed point of the antenna 505, which can ensure that the rf signal is transmitted through the antenna, thereby ensuring good communication capability of the terminal.
Compared with the prior art, the switching circuit is arranged in the implementation mode to achieve signal receiving and transmitting of multiple sections of frequencies, stable signal transmitting and receiving of the antenna are guaranteed, the implementation mode is simple and easy to operate, cost is low, the corresponding antenna switching device can be arranged according to the requirement of the control signal, the circuit structure is flexible, and the number of the control ports of the processor can be matched with the corresponding switching circuit to enable the antenna to work in different communication frequency bands.
It should be understood that this embodiment is a system example corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
A fourth embodiment of the present invention relates to a terminal. The fourth embodiment is substantially the same as the third embodiment, and mainly differs from the third embodiment in that: the connection relationships and the circuit diagram are shown in a specific circuit diagram.
The radio frequency transmission circuit comprises a third resistor element R3, a fourth resistor element R4, a sixth capacitor element C6 and a seventh capacitor element C7; a first connection terminal of the third resistance element R3 is connected to a first connection terminal of the sixth capacitance element C6, a second connection terminal of the sixth capacitance element C6 is grounded, and a second connection terminal of the third resistance element R3 is connected to a first connection terminal of the seventh capacitance element C7 and a first connection terminal of the fourth resistance element R4.
Specifically, in fig. 6, the RF terminal is a connection terminal between the RF circuit and the RF transmission circuit, and the processor sends control information to control the antenna switching device, where the control information is preset in the memory. The first feed point ANT1, the second feed point ANT2, and the third feed point ANT3 are all antenna connectors, and the antenna connectors are metal elastic pieces or metal pins for connecting a motherboard or an antenna, but are not limited thereto in practice.
Since the second embodiment and the present embodiment can be implemented in cooperation with each other. Therefore, the related technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. An antenna switching device comprising at least one switching circuit, said switching circuit comprising: a first matching circuit, a second matching circuit, a first capacitive element, a second capacitive element, a first gating element, a second gating element, a first control transmission circuit, and a second control transmission circuit;
the first end of the first control transmission circuit is used for receiving a first control signal, the second end of the first control transmission circuit is connected with the positive electrode of the first gating element and the first connecting end of the first capacitance element, the second connection end of the first capacitor element is respectively connected with the first end of the first matching circuit and the first feed point of the feed part of the antenna, the second end of the first matching circuit is grounded, the negative pole of the first gating element is connected with the first end of the second matching circuit and the first connecting end of the second capacitance element, the second end of the second matching circuit is grounded, the first end of the second control transmission circuit is used for receiving a second control signal, a second connection end of the second capacitor element is connected with the anode of the second gating element and the second end of the second control transmission circuit, and the cathode of the second gating element is grounded;
when the first end of the first control transmission circuit receives a first control signal, the first gating element is in a conducting state under the control of the first control signal, and when the first end of the second control transmission circuit receives a second control signal, the second gating element is in a stopping state according to the second control signal;
or when the first end of the first control transmission circuit receives a first control signal, the first gating element is in a cut-off state according to the first control signal, and when the first end of the second control transmission circuit receives a second control signal, the second gating element is in a conducting state according to the second control signal.
2. The antenna switching device of claim 1 wherein the first and second gating elements are PIN diodes.
3. The antenna switching device according to claim 1 or 2, wherein the first control transmission circuit includes: a first resistive element, a third capacitive element, and a first inductive element;
the first connection end of the first resistance element is used for receiving a first control signal for the first end of the first control transmission circuit, the second connection end of the first resistance element is connected with the first connection end of the third capacitance element and the first connection end of the first inductance element, the second connection end of the third capacitance element is grounded, and the second connection end of the first inductance element is used for the second end of the first control transmission circuit.
4. The antenna switching device according to claim 1 or 2, wherein the second control transmission circuit includes: a second resistive element, a fourth capacitive element, and a second inductive element;
the first connection end of the second resistance element is the first end of the second control transmission circuit for receiving a second control signal, the second connection end of the second resistance element is connected with the first connection end of the fourth capacitance element and the first connection end of the second inductance element, the second connection end of the fourth capacitance element is grounded, and the second connection end of the second inductance element is the second end of the second control transmission circuit.
5. The antenna switching device according to claim 1 or 2, wherein the first matching circuit comprises a third inductive element;
the first connection end of the third inductive element is the first end of the first matching circuit, and the second connection end of the third inductive element is the second end of the first matching circuit.
6. The antenna switching device according to claim 1 or 2, wherein the second matching circuit comprises: a fourth inductance element and a fifth capacitance element;
the fifth capacitive element and the fourth capacitive element are connected in parallel, a first connection end of the fourth capacitive element and a first connection end of the fifth capacitive element are connected and serve as a first end of a second matching circuit, and a second connection end of the fourth capacitive element and a second connection end of the fifth capacitive element are connected and serve as a second end of the second matching circuit;
or,
the second matching circuit comprises a fourth inductive element;
the first connection end of the fourth inductive element is the first end of the second matching circuit, and the second connection end of the fourth inductive element is the second end of the second matching circuit.
7. A terminal, comprising: the antenna switching arrangement, processor, radio frequency circuitry, radio frequency transmission circuitry and antenna of any one of claims 1 to 6;
the processor is used for sending the control signal, the processor is electrically connected with the first end of the first control transmission circuit, and the processor is electrically connected with the first end of the second control transmission circuit;
the output end of the radio frequency circuit is connected with the first end of the radio frequency transmission circuit, and the radio frequency circuit sends out a radio frequency signal;
the antenna comprises an antenna body, a ground feeding part and a feeding part, wherein the feeding part of the antenna at least comprises a first feed point and a second feed point, the first feed point is connected with a second connecting end of the first capacitor element in the antenna switch device, the second feed point is connected with a second end of the radio frequency transmission circuit, the ground feeding part comprises a third feed point, and the third feed point is connected with a grounding end and used for grounding the antenna.
8. The terminal of claim 7, wherein the first feed point, the second feed point, and the third feed point are all antenna connectors, and wherein the antenna connectors are metal elastic pieces or metal pins for connecting a motherboard or an antenna.
9. A terminal according to claim 7 or 8, characterized in that the radio frequency transmission circuit comprises: a third resistive element, a fourth resistive element, a sixth capacitive element, and a seventh capacitive element;
the first connection end of the third resistance element is connected with the first connection end of the sixth capacitance element, the second connection end of the sixth capacitance element is grounded, and the second connection end of the third resistance element is connected with the first connection end of the seventh capacitance element and the first connection end of the fourth resistance element;
the second connection end of the fourth resistance element is the first end of the radio frequency transmission circuit, and the connection end of the first connection end of the third resistance element and the first connection end of the sixth capacitance element is the second end of the radio frequency transmission circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710500340.4A CN107147404B (en) | 2017-06-27 | 2017-06-27 | A kind of antenna switchgear and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710500340.4A CN107147404B (en) | 2017-06-27 | 2017-06-27 | A kind of antenna switchgear and terminal |
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| CN107147404B true CN107147404B (en) | 2019-06-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101552373A (en) * | 2008-04-04 | 2009-10-07 | 夏普株式会社 | Antenna device and communication device using same |
| CN103873021A (en) * | 2012-12-17 | 2014-06-18 | 京信通信系统（中国）有限公司 | Radio frequency amplitude limiting protection circuit |
| CN105610420A (en) * | 2015-12-21 | 2016-05-25 | 深圳市科陆电子科技股份有限公司 | Multichannel ultrahigh-frequency RFID antenna switch switcher |
| CN205986856U (en) * | 2016-08-23 | 2017-02-22 | 海能达通信股份有限公司 | Transceiver and transmit -receive switch thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8126410B2 (en) * | 2007-06-07 | 2012-02-28 | Vishay Intertechnology, Inc. | Miniature sub-resonant multi-band VHF-UHF antenna |
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2017
- 2017-06-27 CN CN201710500340.4A patent/CN107147404B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552373A (en) * | 2008-04-04 | 2009-10-07 | 夏普株式会社 | Antenna device and communication device using same |
| CN103873021A (en) * | 2012-12-17 | 2014-06-18 | 京信通信系统（中国）有限公司 | Radio frequency amplitude limiting protection circuit |
| CN105610420A (en) * | 2015-12-21 | 2016-05-25 | 深圳市科陆电子科技股份有限公司 | Multichannel ultrahigh-frequency RFID antenna switch switcher |
| CN205986856U (en) * | 2016-08-23 | 2017-02-22 | 海能达通信股份有限公司 | Transceiver and transmit -receive switch thereof |
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| CN107147404A (en) | 2017-09-08 |
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