KR100343529B1 - Dipole antenna for arranging in an interior of a terminal for wireless data communication - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a dipole antenna for embedding in a terminal.

2. The problem to be solved by the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a dipole antenna that is built in a case or cover of a wireless communication terminal, satisfies electrical performance, and can be easily portable.

3. Summary of Solution to Invention

The present invention provides impedance matching means for matching an input electromagnetic wave to a predetermined impedance; First and second coupling means for coupling an electromagnetic wave impedance matched by the impedance matching means; First radiation means for radiating electromagnetic waves coupled by the first coupling means; And second radiation means for radiating electromagnetic waves coupled by the second coupling means, which is disposed on the PCB and embedded in the wireless communication terminal.

4. Important uses of the invention

The present invention is used in a wireless communication terminal.

Description

DIPOLE ANTENNA FOR ARRANGING IN AN INTERIOR OF A TERMINAL FOR WIRELESS DATA COMMUNICATION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dipole antenna used in wireless communication terminals such as digital cellular, personal mobile communication, wireless data communication, frequency common communication, and future land mobile communication, and in particular, a printed circuit board (PCB) type. The present invention relates to a dipole antenna that can be manufactured and built into a terminal.

In general, portable terminals are used in wireless communication such as digital cellular, personal mobile communication, and frequency common communication. Such a conventional antenna mounted on a wireless communication terminal is used in parallel with a monopole or helical method, and these conventional antennas are protruded to the outside of the terminal.

However, in the case of the conventional antenna for a terminal as described above, the brain is damaged by radio waves transmitted and received by the head portion of the human body where the brain is generally located during communication, and it is inconvenient to put the terminal in the pocket because of the antenna that protrudes. In addition, there was a problem that can be easily broken even if you carry the terminal in the pocket.

In addition, a terminal such as a future mobile communication or a wireless data communication such as wireless data communication and the next generation mobile communication (IMT2000) looks at a small monitor while looking at a small monitor unlike a conventional mobile communication terminal that transmits and receives voice data to and from the human ear. As a method of transmitting and receiving data, the conventional antenna for a terminal as described above has to be folded over 90 degrees during a call in order to meet vertical polarization, and it must be re-folded after use.

Accordingly, the present invention has been made in order to solve the above problems, it is embedded in the case (case) or cover of the wireless data communication terminal, to meet the electrical performance and to the portable terminal for a wireless data communication to make it easy to carry the terminal Its purpose is to provide a dipole antenna for embedding.

Another object of the present invention is to provide a dipole antenna for embedding in a terminal for wireless data communication that can be miniaturized at various ratios by using a PCB having a high dielectric constant.

1A and 1B are structural diagrams of an embodiment of a dipole antenna according to the present invention;

2 is a side view of an embodiment of a dipole antenna according to the present invention;

Figure 3 is an embodiment characteristic view of the input impedance of the dipole antenna according to the present invention.

Figure 4 is an embodiment characteristic view of the standing wave ratio of the dipole antenna according to the present invention.

5A and 5B illustrate an embodiment radiation pattern of a dipole antenna according to the present invention.

Explanation of symbols on the main parts of the drawings

11 to 20: first to 16th transmission lines

21: hole 22: connector

23 cable 24 dielectric

25, 26: copper foil pattern

In order to achieve the above object, the present invention provides a dipole antenna mounted on a wireless communication terminal, comprising: impedance matching means for matching an input electromagnetic wave to a predetermined impedance; First and second coupling means for coupling an electromagnetic wave impedance matched by the impedance matching means; First radiation means for radiating electromagnetic waves coupled by the first coupling means; And second radiating means for radiating electromagnetic waves coupled by the second coupling means, which is disposed on a printed circuit board (PCB) and embedded in the wireless communication terminal.

The present invention having the configuration as described above, the wireless data communication terminal built-in antenna, satisfies the electrical performance, and because of the structural features of the conventional antenna for the terminal eliminates the worry of discomfort or damage caused by the antenna and the appearance of the terminal It can be diversified in design. Also, it can be miniaturized in wireless communication terminals such as digital cellular, personal mobile communication, and frequency common communication, and it can be built out of the reach of the case, such as wireless data communication and next generation mobile communication (IMT2000). In the terminal of the future mobile communication or the like, it can be installed in the monitor protective cover. That is, the dipole antenna of the present invention is a dipole antenna for embedding in the terminal for wireless data communication, and its frequency is approximately 800 MHz to 1000 MHz. For example, 896 MHz to 940 MHz.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are structural diagrams of an embodiment of a dipole antenna according to the present invention, and FIG. 1A illustrates a structure of a transmission line disposed on a front side of a PCB, and FIG. 1B illustrates a structure of a transmission line disposed on a rear side of a PCB. It is shown.

As shown in the figure, the dipole antenna of the present invention includes first and second transmission lines 11 and 12 that match an electromagnetic wave input from the outside to an input impedance of λ / 4 (where λ is a wavelength). And third and fourth transmission lines 13 and 14 for matching electromagnetic waves impedance-matched by the first and second transmission lines 11 and 12 back to an input impedance of λ / 4, and third and fourth transmission lines. The fifth and eighth transmission lines 15 and 18 for supplying the electromagnetic wave impedance matched by the furnaces 13 and 14 to the radiation element, and the electromagnetic waves supplied through the fifth and eighth transmission lines 15 and 18 Holes commonly connected to one end of the sixth, seventh, ninth, and tenth transmission lines 16, 17, 19, and 20 to radiate, and the seventh and tenth transmission lines 17, 20 ( 21).

In addition, the outside of the dipole antenna of the present invention, a connector 22 for receiving electromagnetic waves from the outside, and a cable for transmitting electromagnetic waves transmitted through the connector 22 to the first and second transmission lines 11 and 12 ( cable 23 is further provided.

The PCB 27 is small enough to be embedded in a wireless data communication terminal and is a double-sided board. Then, the PCB 27 is bent so that the radiating element is vertically symmetrical for miniaturization.

The first and second transmission lines 11 and 12 are symmetrically arranged parallel to the front and rear surfaces of the PCB 27, and have the same width and the wavelength length of λ / 4. In this way, in the first and second transmission lines 11 and 12 arranged parallel to both sides of the PCB 27, electromagnetic waves input through the cable 23 are matched with an input impedance of λ / 4, and between transmission lines. The electric field is excited and transmitted to the third and fourth transmission lines 13 and 14. In addition, the currents induced in the first and second transmission lines 11 and 12 have the same intensity and differ in phase by 180 degrees.

The third transmission line 13 connected to the first transmission line 11 and the fourth transmission line 14 connected to the second transmission line 12 are similarly symmetrically parallel to the front and rear surfaces of the PCB 34. Arranged, having the same width and wavelength of λ / 4. Therefore, the electromagnetic waves impedance-matched by the first and second transmission lines 11 and 12 are again matched with an impedance of λ / 4 through the third and fourth transmission lines 13 and 14.

As such, the impedance matched electromagnetic waves are coupled to the sixth and seventh transmission lines 16 and 17 through the fifth transmission line 15, and also the ninth and tenth transmission lines through the eighth transmission line 18. Coupled to (19, 20). At this time, the electromagnetic waves are coupled in parallel in the same plane and connected at intermediate points.

Here, the fifth transmission line 15 connected to the third transmission line 13 and the eighth transmission line 18 connected to the fourth transmission line 14 have the same width and length, and the PCB 27. Are arranged symmetrically parallel to the front and back of the.

Similar widths are also applied to the sixth and seventh transmission lines 16 and 17 connected to the fifth transmission line 15 and the ninth and tenth transmission lines 19 and 20 connected to the eighth transmission line 18. It has a length and and is arranged symmetrically parallel to the front and rear of the PCB (27). The sixth and seventh transmission lines 16 and 17 and the ninth and tenth transmission lines 19 and 20 having such a structure are dipole radiation elements, and the current flowing through the radiation elements has a 180 degree phase difference. Currents induced by the sixth and ninth transmission lines 16 and 19 are canceled, in which case the electric and magnetic fields are similarly canceled so that no electromagnetic radiation is generated into the space, and the seventh and tenth transmission lines 17 and 20 Since the induced current does not have a phase difference, it becomes a part of electromagnetic radiation.

In addition, the fifth transmission line 15 connected to the third transmission line 13 and the eighth transmission line 18 connected to the fourth transmission line 14 are the sixth and seventh transmission lines 16 which are radiation elements. , 17) and the ninth and tenth transmission lines 19 and 20, respectively, are tightly coupled in the same plane, so that electromagnetic coupling occurs simultaneously.

The first, third and fifth transmission lines 11, 13, and 15 transmit the second, fourth, and eighth transmission lines 12, 14, and 18 symmetrically in parallel to the front and rear surfaces of the PCB 27. The 180-degree phase difference is generated in the current to cancel the electric field and the magnetic field so as not to interfere with the electromagnetic waves radiated by the seventh and tenth transmission lines 17 and 20.

On the other hand, since the input impedance of the dipole antenna of the present invention varies depending on the shape of the terminal, the material, and the attachment position, the line widths of the first to fourth transmission lines 11 to 14, the fifth and eighth transmission lines 15, 18), the gap between the sixth and seventh transmission lines 16 and 17 and the ninth and tenth transmission lines 19 and 20, the fifth and eighth transmission lines 15 and 18 and the sixth and ninth transmission lines The matching position of the furnaces 16 and 19 and the thickness of the dielectric substrate may be adjusted to match.

The first and second transmission lines 11 and 12, the fifth transmission line 15, and the third and fourth transmission lines 13 and 14 and the eighth transmission line 18 are T-coupled baluns. ) To achieve a wideband structure.

In particular, the dipole antenna of the present invention as described above, the width and length of the transmission line is reduced as the dielectric constant of the dielectric is increased and can be manufactured in various sizes.

2 is a side view of an embodiment of a dipole antenna according to the present invention, and has a structure composed of a dielectric material 24 and copper foil patterns 25 and 26 positioned on upper and lower layers of the dielectric material 24.

Referring to FIG. 2, the basic operation principle of the dipole antenna according to the present invention is that electromagnetic waves flow through the dielectric 24, and the copper foil pattern 25 disposed on the upper layer of the dielectric 24 and the copper foil pattern 26 disposed on the lower layer are illustrated. Through) current flows. At this time, a current having a magnitude but opposite polarity flows through the copper foil patterns 25 and 26.

Figure 3 is a characteristic view showing a simulation result of the input impedance of the dipole antenna according to the present invention. As shown in the figure, three arrows in the figure indicate the starting frequency of the frequency band of use of the dipole antenna of the present invention. , Intermediate frequency and end frequency. That is, the '1' arrow represents 896 MHz, which is the starting frequency of the dipole antenna of the present invention, and the '2' arrow represents 922 MHz, which is the intermediate frequency of the dipole antenna of the present invention, and the '3' arrow represents the present invention. The end frequency of the dipole antenna is 940 MHz.

Figure 4 is a characteristic view showing a simulation result of the standing wave ratio of the dipole antenna according to the present invention. The frequency band of the dipole antenna of the present invention for wireless data communication is 896MHz to 940MHz, The x-axis of the characteristic diagram represents a frequency of 800 MHz to 1000 MHz as the frequency axis, and the y-axis of the characteristic diagram of the present invention indicates that the stationary wave ratio (VSWR) axis starts at 1 and increases by 1 for each column.

5A and 5B illustrate an exemplary radiation pattern of a dipole antenna according to the present invention.

In the figure, the simulation result is a broadband having a bandwidth of 10% or more (that is, when the standing wave ratio is 2: 1), and the gain is an omni antenna characteristic of 0 dBi or more, which satisfies the performance as a terminal antenna for wireless data communication.

On the other hand, the present invention as described above, the form is embedded in a plastic case or cover of the terminal, compared to the conventional monopole (helical) or helical (helical) antenna radiation pattern is similar and broadband impedance matching is easy, and also the terminal It is built in a cover or case of a liquid crystal display (LCD), which is easy to carry and has the advantage of modifying the appearance of the terminal in various ways.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention has the following effects by manufacturing a dipole antenna used in a wireless communication terminal in the form of a PCB and embedding it in the terminal.

First, the appearance of the terminal can be variously designed compared to the existing one, which is embedded in the case or the cover of the terminal, and accordingly, the product quality of the terminal can be significantly increased.

Second, compared to the conventional antenna that protrudes out of the terminal, it is possible to significantly reduce the probability of damage when carrying.

Third, since the built-in dipole antenna of the present invention is located at the lower part of the head where the brain is located during communication, the brain can be prevented from being damaged by radio waves.

Fourth, when applied to image data transmission terminals such as wireless data communication and next-generation mobile communication (IMT-2000), it can be installed on the cover of the LCD. It is very convenient to use.

Claims (15)

A dipole antenna for embedding in a wireless data communication terminal, First and second impedance matching means, respectively arranged in parallel to both surfaces of the circuit board PCB, for matching an input electromagnetic wave to a predetermined impedance; First coupling means arranged to be connected to said first impedance matching means, for coupling an impedance matched electromagnetic wave; Second coupling means connected to said second impedance matching means and arranged to be symmetrical in parallel with said first coupling means, for coupling an impedance matched electromagnetic wave; First radiating means arranged to be connected to said first coupling means and for radiating electromagnetic waves; And Second radiating means connected to said second coupling means and disposed symmetrically in parallel to said first radiating means, for radiating electromagnetic waves; Dipole antenna for embedding in the wireless data communication terminal comprising a. delete delete delete delete delete delete The method of claim 1, The first and second impedance matching means, A dipole antenna for embedding in a wireless data communication terminal having the same pattern. The method of claim 1, The first and second coupling means, A dipole antenna for embedding in a wireless data communication terminal having the same pattern. The method of claim 1, The first and second copy means, A dipole antenna for embedding in a wireless data communication terminal having the same pattern. The method of claim 1, The first impedance matching means, A first impedance matching unit disposed on one surface of the PCB and matching the input electromagnetic waves to the predetermined impedance; And A second impedance matching part arranged to be connected to the first impedance matching part in a straight line, and matching the electromagnetic wave matched to the impedance by the first impedance matching part to the predetermined impedance again and transferring the electromagnetic wave to the first coupling means; Dipole antenna for embedding in a wireless data communication terminal comprising a. The method of claim 1, The second impedance matching means, A third impedance matching unit disposed on one surface of the PCB and matching the input electromagnetic waves to the predetermined impedance; And A fourth impedance matching part arranged to be connected to the third impedance matching part in a straight line, and matching the electromagnetic wave matched to the impedance by the third impedance matching part to the predetermined impedance again and transferring the electromagnetic wave to the second coupling means; Dipole antenna for embedding in a wireless data communication terminal comprising a. The method according to any one of claims 1, 11 or 12, The predetermined impedance is A dipole antenna for incorporation into a wireless data communication terminal, wherein substantially λ / 4 (where λ is a wavelength). The method according to claim 1 or 11, wherein The first impedance matching means and the first coupling means, A dipole antenna for embedding in a wireless data communication terminal, characterized in that the T-coupled balloon structure. The method according to claim 1 or 12, The second impedance matching means and the second coupling means, A dipole antenna for embedding in a wireless data communication terminal, characterized in that the T-coupled balloon structure.