CN104022357B - A kind of multiband ultra-wideband antenna - Google Patents

Abstract

The invention relates to a multi-band ultra-wideband antenna and belongs to the technical field of antennas. The invention includes a radiator, a ground plane and a central feed point. The radiator includes a first radiating unit (1), a second radiating unit (2) and a third radiating unit (5), respectively corresponding to GPS L1, WLAN and UWB frequency bands of the antenna. Impedance characteristics in the ultra-wideband frequency domain are improved by adding an L-shaped slot (6) on the radiator and a third slot (8) on the grounding plate (11). The invention has the characteristics of simple structure, stable performance and easy integration with mobile terminals. The operating frequencies of the multi-band ultra-wideband antenna of the present invention include GPS L1 (1.575GHz), WLAN (2.4GHz) and ultra-wideband UWB (3.1-10.6GHz).

Description

A multi-band ultra-wideband antenna

technical field

The invention relates to the technical field of wireless communication, in particular to a multi-band ultra-wideband antenna.

Background technique

The ultra-wideband system has the advantages of large bandwidth and low transmission power, and is very suitable for wireless transmission and reception of short-distance and large data, and the ultra-wideband antenna is a very important part of the ultra-wideband system.

With the rapid development of mobile terminals, wireless communication systems of various standards have emerged one after another, and the number of antennas in the terminal is also increasing. The mutual coupling between antennas and between antennas and other devices will greatly affect the performance of antennas. How to include more frequency bands without increasing the number of antennas is an urgent problem to be solved.

Contents of the invention

In order to solve the technical problem that the existing antenna is only applicable to a single frequency band, the present invention provides a small-sized, simple-structured, low-cost ultra-wideband antenna applicable to multiple frequency bands.

The purpose of the present invention is achieved through the following technical solutions:

A multi-band ultra-wideband antenna, comprising: a first radiating unit, a second radiating unit, a third radiating unit and a grounding plate,

The first radiating unit is a U-shaped metal patch with grooves and first slits;

The second radiating unit is a rectangular metal patch with a second gap between it and the first radiating unit;

The third radiating unit is an irregular metal patch with an L-shaped slit;

The grounding plate is a metal patch with a third gap.

Preferably, the corresponding resonant frequency and bandwidth are adjusted by adjusting the lengths of the groove, the first slot, the second slot and the second radiation unit of the first radiation unit, and the L-shaped slot in the third radiation unit.

Preferably, the first radiation unit corresponds to the GPS L1 frequency band of the antenna, the second radiation unit corresponds to the WLAN frequency band of the antenna, and the third radiation unit corresponds to the UWB frequency band of the antenna.

Preferably, the groove has a length of 26 mm and a width of 2.5 mm.

Preferably, the first slit has a width of 0.5mm and a length of 2.5mm.

Preferably, the second slit has a width of 1mm and a length of 29mm.

Preferably, the corresponding frequency of the second radiating unit is 2.4 GHz, and reducing the width of the second slit will increase the resonant frequency and decrease the bandwidth of the second radiating unit; increasing the width of the L-shaped slit will increase the bandwidth of the UWB frequency band.

Preferably, the radiator and the ground plate feed power directly to the radiator from the fourth slot through a 50Ω coaxial line, and the radiator includes a first radiation unit, a second radiation unit and a third radiation unit.

Preferably, the width of the ground plate is smaller than the width of the radiation unit.

The principle of the present invention is: using single antenna to realize multi-frequency band technology, separating multiple radiation units on the radiator and opening gaps in the grounding plate to achieve the purpose of realizing multi-frequency bands.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention has very good ultra-wideband characteristics in frequency bands of GPS L1 (1.575GHz), WLAN (2.4GHz) and UWB (3.1GHz-10.6GHz). Multiple frequency bands can be realized on a single antenna, which can better overcome the disadvantage that multiple antennas cannot be installed due to the small internal space of the mobile terminal.

2. The structure is simple, the weight is light, and meets the requirements of graphic design; the manufacturing cost is low (it can be engraved with a copper film), and meets the requirements of miniaturized mobile terminals.

3. The antenna of the present invention has no dielectric board, that is, it can be pasted on foam or plastic with a relative dielectric constant of 1, and has strong flexibility. Adapt to work with existing communication equipment and meet the requirements of multiple communication systems.

Description of drawings

Figure 1 is a schematic diagram of a multi-band ultra-wideband structure;

Fig. 2 is the simulation and test result of VSWR;

Figure 3 is the E-plane simulation result;

Figure 4 is the H-plane simulation results.

Explanation of reference numerals: 1. first radiating unit; 2. second radiating unit; 3. second slit; 4. first slit; 5. third radiating unit; 6. L-shaped slit; 7. rectangular metal sheet; 8. The third gap; 9. The groove; 10. The fourth gap; 11. The grounding plate; W1, the width of the grounding unit; W2, the width of the radiation unit.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

Figure 1 is a schematic front view of the antenna. The multi-band ultra-wideband antenna of the present invention has multiple resonance branches, and the ultra-wideband antenna includes a first radiating unit 1, a second radiating unit 2, a third radiating unit 5 and a metal patch grounding plate 11 with slots. The width W1 of the ground plate 11 is smaller than the width W2 of the radiation unit. The first radiating unit 1 is a U-shaped metal patch, which is provided with a groove 9 and a first slit 4. The groove 9 is rectangular and has a first slit 4 on the outside near the end of the feeding point; the second radiating unit 2 is Rectangular metal patch, the second slit 3 is set between the second radiating unit 2 and the first radiating unit 1, the second slit 3 is parallel to the arms of the U-shaped metal patch; the third radiating unit 5 is an irregular metal patch piece. The ground plate 11 is a metal patch with a third slit 8, the third slit 8 is opened at one end close to the feed point and the width of the ground plate becomes narrow near the feed point to form a rectangular metal sheet 7.

The first radiating unit 1 covers the GPS L1 frequency band, and its characteristic is resonance. Adjust the groove 9, the first slit 4, and the second slit 3 of the U-shaped metal patch to change the length and width of the U-shaped metal patch, that is, to change the ultra-wideband antenna resonant frequency, bandwidth and radiation pattern. Groove 9 length and width increase can reduce its resonant frequency, and its length is 26mm in the present invention, and width is 2.5mm, and second slit 3 width increase can reduce its resonant frequency, and its width is 1mm among the present invention, and length is 29mm, The first slit 4 has a width of 0.5 mm and a length of 2.5 mm.

The second radiating unit 2 covers the WLAN frequency band, and its characteristic is resonance. There is a second gap 3 between the rectangular metal patch and the first radiating unit 1. The length of the rectangular metal patch and the second gap 3 will affect the resonance frequency and the WLAN frequency band. the antenna impedance.

The third radiating unit 5 covers the UWB frequency band, and there is an L-shaped slit 6 on the irregular metal patch. By changing the shape of the L-shaped slit 6 and the third slit 8 on the ground plate 11, the antenna impedance of the UWB frequency band is adjusted to obtain a higher Good voltage standing wave ratio, the length of the L-shaped slot 6 and the third slot 8 on the ground plate 11 have a relatively large impact on the antenna impedance, the reason is that the length of the slot has a relatively large impact on the current path on the antenna surface, that is, the Antenna impedance.

For the ground plate 11 , the antenna impedance of the UWB frequency band can be changed by adjusting the parameters of the third slot 8 . The third slit 8 has a width of 0.5mm and a length of 5.5mm. A fourth gap 10 is provided between the third radiation unit 5 and the ground plate 11. The width of the fourth gap 10 between the third radiation unit 5 and the rectangular metal patch 7 is 1mm, and the fourth gap 10 is connected through a 50Ω coaxial line from the fourth The slot 10 directly feeds the three radiating elements.

The above operations are all to make the antenna have GPS, WLAN, UWB frequency bands, make the actual antenna and use the Agilent E5071C vector network analyzer to measure it. Figure 2 shows the measurement and simulation data of the antenna, from which the simulation of the antenna is obtained. The data are basically consistent with the measured data. The simulation data of the antenna pattern are shown in Fig. 3 and Fig. 4. It can be seen that the technical solution of the present invention can better overcome the disadvantage that multiple antennas cannot be installed due to the small internal space of the mobile terminal.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (8)

1. A multi-band ultra-wideband antenna, comprising: a first radiation unit (1), a second radiation unit (2), a third radiation unit (5) and a ground plate (11), characterized in that: The first radiating unit (1), the second radiating unit (2) and the third radiating unit (5) are radiators connected as one; The first radiating unit (1) is two U-shaped metal patches symmetrical to each other, with a groove (9) and a first slit (4) on it, and the first slit (4) is opened in the groove (9) The outer side near the end of the feed point; The second radiating unit (2) is a rectangular metal patch, which is arranged between the first radiating units, and there is a second gap (3) between it and the first radiating unit (1), and the second gap (3) Parallel to the arms of the U-shaped metal patch; The third radiating unit (5) is an irregular metal patch with an L-shaped slit (6); A fourth gap (10) is provided between the third radiation unit (5) and the grounding plate (11); The grounding plate (11) is a metal patch with a third slit (8), and the third slit (8) is opened at one end close to the feeding point; The first radiation unit (1) corresponds to the GPS L1 frequency band of the antenna, the second radiation unit corresponds to the WLAN frequency band of the antenna, and the third radiation unit corresponds to the UWB frequency band of the antenna. 2. The multi-band ultra-wideband antenna according to claim 1, characterized in that: by adjusting the groove (9), the first slit (4), the second slit (3) and the second The length of the radiation unit (2) and the L-shaped slot (6) in the third radiation unit (5) are used to adjust the corresponding resonance frequency and bandwidth. 3. The multi-band ultra-wideband antenna according to claim 1, characterized in that: the slot (9) has a length of 26 mm and a width of 2.5 mm. 4. The multi-band ultra-wideband antenna according to claim 1, characterized in that: the width of the first slot (4) is 0.5 mm, and the length is 2.5 mm. 5. The multi-band ultra-broadband antenna according to claim 1, characterized in that: the second slot (3) has a width of 1 mm and a length of 29 mm. 6. The multi-band ultra-wideband antenna according to claim 1, characterized in that: the corresponding frequency of the second radiating unit (2) is 2.4GHz, and the width reduction of the second slit (3) will make the second radiating unit The resonance frequency increases and the bandwidth decreases; the increase of the width of the L-shaped slot (6) increases the bandwidth of the UWB frequency band. 7. The multi-band ultra-wideband antenna according to claim 1, characterized in that: the radiator and the grounding plate (11) feed power directly to the radiator from the fourth slot (10) through a 50Ω coaxial line. 8. The multi-band ultra-wideband antenna according to claim 1, characterized in that: the width (W1) of the grounding plate (11) is smaller than the width (W2) of the radiation unit.