KR102092028B1 - Self-Calibration Antenna for Maintains Similar Resonant Characteristic in Different Ground Environments - Google Patents

Abstract

The present invention relates to a self-calibration antenna maintaining a similar resonant characteristic in a different ground environment. In the self-calibration antenna, an open-loop or closed-loop balun circuit portion of the electric length corresponding to 0.25 λ of a target frequency band is connected to the ground, a driver element combined impedance regulator is connected to one side of the balun circuit to strengthen the area by electrical coupling and to adjust the impedance of the target frequency band, and a radiation element combined a coupling element connected in the electrical length corresponding to 0.25 λ of the frequency band is connected to the other side of the balun circuit portion. The present invention is applied to an environment in which the ground environment is rapidly changed in a pin-tech, a card-based wireless communication solution, a foldable smart phone, or the like thereby creating comfort in signal quality so that the antenna is stable in stable communication in different operating environments.

Description

Self-Calibration Antenna for Maintains Similar Resonant Characteristic in Different Ground Environments

The present invention relates to a self-correcting antenna that maintains intended resonance characteristics even in other ground environments.

In general, the antenna design is designed to operate in a desired band with a fixed grounding environment, which is a basic environment for antenna characteristics. For example, an antenna optimized for a grounding environment in the state of A may significantly deteriorate antenna performance or fail to operate in a grounding environment of B.

Therefore, the most commonly used planar inverted F antenna (PIFA) or inverted F antenna (IFA) is used as the antenna for small communication devices with relatively strong characteristics of changes in the surrounding grounding environment. Performance degradation is unavoidable when a large earth environment change, such as a metallic structure, occurs. The flat-panel F antenna is a flat-panel antenna with a smaller area of a square patch plate on the ground part of the plate, as if the F-shape is turned over. It consists of a grounding part, a patch and a feeder line and a shorting pin or shorting strip. The flat reverse F antenna acts as a radiating element as the patch resonates with the ground by current feeding, and the bandwidth, gain, and resonance frequency are determined depending on the height, width, length of the patch, and the location of the feeder and the location of the shorting pin. do. The flat-panel inverted F antenna can be embedded in a mobile phone without a protrusion, and in order to improve directionality, two are attached to both sides of the mobile phone or overlapped for dual modes of two frequency bands.

In FIG. 1A, the flat plate inverted F antenna 1 is designed with a flat plate inverted F antenna 1 and a radiating element 3 in the grounding portion 2, so that a strong electric field is formed in the radiating element 3, and FIG. In, referring to the graph showing the electric field strength of each portion of the flat-plate inverted F antenna 1, resonance characteristics in the 2.4 GHz band are shown. However, in FIG. 2A, a case in which another metal medium 4 of processing, for example, a metal body, is designed adjacent to the flat inverted F antenna 1 is designed. Therefore, in FIG. 2B, referring to the graph showing the electric field strength for each part when the flat plate inverted F antenna 1 is surrounded by the processed metal medium 4, deterioration of resonance characteristics and electric field strength deterioration occur in the 2.4 GHz band. Is showing.

In addition, even if it is inevitably applied to applications in which the grounding environment is different, products with compromised performance compromised at the proper line are often released. Therefore, in order to actively solve this problem, in FIG. 3, although a reconfigurable antenna 5 using a pin diode is used, an increase in manufacturing and design costs and wiring for pin diode control In addition to the processing problem, there is a problem in that it has a number of constraining factors such as an increase in the load in the terminal system for controlling the pin diode.

As a prior art related to the present invention, the multi-band built-in antenna with adjustable resonance frequency and input impedance of Patent Document 1 has one feeding point and two shorting points, and constitutes an inductor between the shorting point and the grounding part. It is disclosed to be able to adjust the resonance frequency and the input impedance.

Republic of Korea Registered Patent Publication No. 10-0756312 (2007.09.06. Announcement)

The present invention is to solve the above problems, and an object of the present invention is to provide an antenna operable in a dual mode in which a large performance variation does not occur due to a change in the ground environment while maintaining the intended resonance characteristics even in a completely different ground environment.

In addition, another object of the present invention is to apply a wide range of applications in a communication field as well as a wireless solution based on a card payment act.

The present invention, in order to achieve the above object, in a self-correcting antenna, an open-loop or closed-loop type balun circuit unit having an electrical length corresponding to 0.25λ of a target frequency band is connected to the ground, and electrically coupled to one side of the balun circuit unit The drive element and the impedance regulator for controlling the area reinforcement and the impedance of the target frequency band are connected, and the coupling element and the radiation element for the coupling element connected to the other side of the balun circuit part with an electric length corresponding to 0.25λ of the frequency band are connected. It is characterized by providing a self-correcting antenna that maintains similar resonance characteristics in a grounded environment.

In addition, in the present invention, in the self-correcting antenna, an open-loop or closed-loop balun circuit portion having an electrical length corresponding to 0.25λ of a target frequency band is connected to the ground portion, and an area is strengthened by electrical coupling to one side of the balun circuit portion. And a drive element combined impedance regulator for adjusting the impedance of the target frequency band is connected, and the ground part is similarly resonant in another ground environment in which a coupling element and a radiating element combined with an electric length corresponding to 0.25λ of the frequency band is connected. It features a self-correcting antenna that retains its characteristics.

In addition, in the present invention, the drive device combined impedance regulator may be simply connected to a pattern length of 0.1λ of the target frequency band or a slot for adjusting capacitance may be added.

In addition, in the present invention, in the first mode having a grounding environment surrounded by a structure of a metal medium closely around the self-correcting antenna, the drive element combined impedance controller is operated, and a free space or an antenna around the antenna is opened to the antenna. In the second mode having an operating ground environment, the drive element combined impedance controller and the coupling element combined radiation element may be operated, respectively.

In addition, in the present invention, in the first mode, the metal medium is electromagnetically coupled with the self-correcting antenna so that a part of the metal medium can operate as a radiator.

In addition, in the present invention, in the second mode having a ground environment that operates as an antenna in a free space or an open terminal around an antenna, the balun circuit unit and the drive element combined impedance controller may not operate as an antenna.

In addition, in the present invention, the self-correcting antenna may be designed on a card equipped with a communication module.

In addition, in the present invention, a terminal equipped with a card slot of a metallic medium into which the card is inserted may emit radiation energy by the electromagnetic correction of the self-calibration antenna to the card slot.

According to the present invention, it is applied to an environment in which the grounding environment is suddenly changed in a pin-tech or card-based wireless communication solution or a foldable smartphone, so that the antennas can perform stable communication even in different operating environments, thereby creating comfort in signal quality. There is an advantage.

1 is a graph showing the electric field strength and resonance characteristics of a general PIFA (reverse flat F antenna) and ground.
FIG. 2 is a graph showing electric field strength and resonance characteristics for each part when a general PIFA (reverse F antenna) is stacked in a metal case.
3 is a picture showing a reconstructed antenna using a general pin diode (PIN Diode).
4 is an embodiment according to the present invention, a configuration diagram showing the role of each component when a self-correcting antenna that maintains similar resonance characteristics in another ground environment is inserted into or adjacent to a metal medium (first mode).
5 is an embodiment according to the present invention, a configuration diagram showing the role of each component in a case where a self-correcting antenna maintaining a similar resonance characteristic in a different ground environment is installed in a free space (second mode).
6 is a self-correcting antenna that maintains similar resonance characteristics in another ground environment according to the present invention, showing the electric field strength and resonance characteristics of each part when the antenna in which the coupling element and the radiating element are separated from the balun circuit unit is in the first mode. It is a graph.
7 is a self-correcting antenna that maintains similar resonant characteristics in another ground environment according to the present invention, showing the electric field strength and resonance characteristics of each part when the antenna in which the coupling element and the radiating element are separated from the balun circuit part is in the second mode. It is a graph.
8 is a graph showing electric field strength and resonance characteristics for each part when the antenna operating in the dual mode is the first mode in the self-correcting antenna maintaining the similar resonance characteristics in another ground environment according to the present invention.
9 is a graph showing electric field strength and resonance characteristics for each part when the antenna operating in the dual mode is the second mode in the self-correcting antenna maintaining the similar resonance characteristics in another ground environment according to the present invention.
10 is a self-correcting antenna in which a self-correcting antenna having a similar resonance characteristic is maintained in a different grounding environment according to the present invention, and a self-correcting antenna with a different pattern of drive element and an impedance adjuster in which the coupling element and the radiation element are separated from the balun circuit part is installed. Is a graph showing the electric field strength and resonance characteristics of each part in the state of operating in the first mode inserted into the slot of the device.
Figure 11 is a self-correcting antenna in a self-correcting antenna that maintains similar resonant characteristics in a different grounding environment according to the present invention, a card in which a self-correcting antenna with a different pattern of drive element and combined impedance regulator in which the coupling element and radiation element are separated from the balun circuit is installed Is a graph showing the electric field strength and resonance characteristics of each part in the state of operating in the second mode in free space.
12 and 13 are graphs showing measurement results of a self-correcting antenna that is operating normally in a self-correcting antenna that maintains similar resonance characteristics in another ground environment according to the present invention.
14 is a configuration diagram showing a role of each configuration in a second mode in which a self-correcting antenna maintaining a similar resonance characteristic in another ground environment is installed in a free space according to another embodiment of the present invention.

Hereinafter, an embodiment of an impedance self-correcting antenna having a drive element that maintains similar resonance characteristics in another ground environment according to the present invention will be described in detail with reference to the accompanying drawings.

Although the present invention is an antenna system having the same structure, the role of each part varies depending on the operating environment. For example, in a general antenna, when adjacent metal bodies are covered with a cover, electromagnetic field energy is totally reflected by a metallic medium. Therefore, the electromagnetic field energy of the antenna is shielded, thereby losing its original characteristics as an antenna. Research to overcome this situation has been conducted in various cases. In addition, in the case of a card having an antenna and a communication module installed in a target frequency band, the card does not work alone, but when inserted into a payment terminal and power is applied to the card, a radio signal containing card information is transmitted. At this time, there are a number of types of payment terminals, some of which have an antenna portion open, but like the standard high-pass terminals of automobile manufacturers, there are also terminals with bad conditions in terms of RF radiation conditions in which the entire card slot is surrounded by a metallic body.

In FIG. 4, the self-correcting antenna 10 is provided with a ground portion 11 for the antenna to operate, and an open loop or a closed loop is connected to the ground portion 11 and the power feeding portion 12. Balun circuit portion 13 of the form is connected. The balun circuit portion 13 has an electrical length corresponding to 0.25λ of the target frequency band in the ground portion 11.

Then, to the left of the balun circuit part 13, an area reinforcement and pattern are developed by electrical coupling, and a drive device combined impedance controller 14 is connected to adjust the Q value and secure the impedance by adjusting the inductance and capacitance of the target frequency band. do. The drive element combined impedance controller 14 may be simply connected with a pattern length of 0.1λ of the target frequency band or a slot for adjusting capacitance may be added.

To the right of the balun circuit part 13, a pattern is developed, and a coupling element and a radiating element 15 for enhancing an electrical coupling force are connected. The coupling element / coupling element 15 is connected to an electric length corresponding to 0.25λ of the target frequency band.

Moreover, the present invention is useful when a metal medium made of a metal structure or the like is located at a position very close to the self-correcting antenna 10 to operate a part of the metal medium as an antenna part through electrical coupling. That is, as the first mode, it is defined as having a grounding environment surrounded by a structure of a metal medium closely around the self-correcting antenna 10. Moreover, the self-correcting antenna 10 is a case where a metal card is applied to a corresponding device equipped with a slot into which a card is inserted and fixed.

In FIG. 5, a configuration diagram showing the role of each part when the self-correcting antenna 10 is operated in free space. The self-correcting antenna 10 is provided with a ground portion 11 for the antenna to operate, and the ground portion 11 and the power feeding portion 12 have an open loop or a closed loop balun ( Balun) circuit part 13 is connected. The balun circuit portion 13 has an electrical length corresponding to 0.25λ of the target frequency band in the ground portion 11. Further, a pattern is developed on the right side of the balun circuit part 13, and a coupling element and a radiating element 15 for enhancing an electrical coupling force are connected. The coupling element / coupling element 15 is connected to an electric length corresponding to 0.25λ of the target frequency band. The characteristic of this configuration is that in the first mode, the drive element combined impedance regulator 14 and the balun circuit 13 operate in a second mode without adjacent metal medium. At this time, the role of the drive element combined impedance controller 14 disappears and does not work like a dummy pattern. The second mode is defined as having a grounding environment that operates as an antenna in a free space or a terminal with an open antenna periphery.

Next, in FIGS. 6 and 7, the electric field strength and resonance characteristics of each part showing the result of separately operating the coupling element and the radiation element 15 in the balun circuit portion 13 separately. That is, FIG. 6 shows that the self-calibration antenna 10 in a state in which the coupling element and radiation element 15 separated from the balun circuit unit 13 is operated as an antenna in a first mode proximate to or surrounded by the metal medium 16. Able to know. However, it can be seen from FIG. 7 that the self-correcting antenna 10 does not operate as an antenna in a second mode in free space that is not enclosed or surrounded by the metal medium 16.

8 and 9, the self-correcting antenna 10 is operated in a dual mode, and FIG. 8 is a metal medium 16, for example, a structure of a metal installed close to the antenna, using a cover or case as part of the antenna It shows the field strength operating in the band. Here, it can be seen that the current and electric field are strongly formed in the drive element combined impedance regulator 14 and the coupling element combined radiating element 15, respectively. 9 shows that the self-correcting antenna 10 is an electric field distribution in free space, and in the second mode, the coupling element and the radiating element 15 in the first mode are converted to a coupling element, so that the electric field strength is strongly formed in the target band. You can see that

On the other hand, in FIG. 10, the metal card with the self-correcting antenna 10 acts as a coupling antenna when in the first mode inserted into the slot of the device, and in FIG. 11, the self-correcting antenna 10 is provided. It can be seen that the metal card does not work as a coupling antenna in the second mode on the free space. Moreover, FIGS. 10 and 11 show that in the self-correcting antennas of FIGS. 6 and 7, the electric field strength and resonance characteristics are slightly different according to the pattern change of the impedance regulator 14 combined with the drive element connected to the balun circuit 13. Able to know.

12 and 13, the self-correcting antenna of the present invention is a graph showing the actual results of normal operation. That is, FIG. 12 is a graph showing the actual measurement result of the self-correcting antenna in the first mode, and FIG. 13 is a graph showing the result of the actual measurement of the self-correcting antenna in the second mode.

In another embodiment of the present invention, in FIG. 14, the ground portion 11 is connected to the open-loop or closed-loop balun circuit portion 13 of an electric length corresponding to 0.25λ of the target frequency band, and the balun circuit portion 13 ) On one side, a drive element combined impedance controller 14 for controlling the area enhancement by electrical coupling and the impedance of the target frequency band is connected. In addition, a coupling element and a radiation element 15, which is connected to the ground portion 11 in an electric length corresponding to 0.25λ of the frequency band, is configured to be connected. Moreover, the structure of the self-correcting antenna having the coupling element and the radiation element 15 coupled to the ground portion 11 has a structure in which the self-calibration antenna 10 and the coupling element and the radiation element 15 for operating in free space are connected to the ground portion ( It is a structure that is directly connected to 11) and is designed to be variable in the form of a coupling radiation element with a wavelength of 0.25λ.

In the above description, the present invention has been illustrated and described in connection with specific embodiments, but it is understood in the art that various modifications and changes are possible without departing from the spirit and scope of the invention as indicated by the claims. Anyone who has it will know it easily.

1: flat reverse F antenna 2: grounding part 3: radiating element 4: metal medium
10: Self-correcting antenna 11: Grounding section 12: Feeding section 13: Balun circuit section 14: Impedance regulator for both drive elements 15: Copying element for coupling elements 16: Metal medium

Claims (8)

In the self-correcting antenna,
An open-loop or closed-loop balun circuit of electric length corresponding to 0.25λ of the target frequency band is connected to the ground,
A drive element combined impedance regulator is connected to one side of the balun circuit to adjust the area by electrical coupling and the impedance of the target frequency band.
The other side of the balun circuit unit is connected to a radiation element that is a coupling element connected to an electric length corresponding to 0.25λ of the frequency band,
In the first mode having a grounding environment enclosed by a structure of a metal medium, the impedance controller for the drive element is operated in the vicinity of the self-correcting antenna,
In a second mode having a ground environment that operates as an antenna in a free space or an open terminal around an antenna, similar resonance characteristics are maintained in different ground environments in which the drive element-combined impedance regulator and the coupling element-combined radiation element are respectively operated. Self-calibration antenna.
In the self-correcting antenna,
An open-loop or closed-loop balun circuit of electric length corresponding to 0.25λ of the target frequency band is connected to the ground,
A drive element combined impedance regulator is connected to one side of the balun circuit to adjust the area by electrical coupling and the impedance of the target frequency band.
A coupling element and a radiating element connected to an electrical length corresponding to 0.25λ of the frequency band are connected to the ground part,
In the first mode having a grounding environment enclosed by a structure of a metal medium, the impedance controller for the drive element is operated in the vicinity of the self-correcting antenna,
In a second mode having a ground environment that operates as an antenna in a free space or an open terminal around an antenna, similar resonance characteristics are maintained in different ground environments in which the drive element-combined impedance regulator and the coupling element-combined radiation element are respectively operated. Self-calibration antenna.
According to claim 1 or claim 2, The drive element combined impedance regulator is simply connected to a pattern length of 0.1λ of the target frequency band, or a slot for adjusting capacitance is added, maintaining similar resonance characteristics in other ground environments. Self-correcting antenna.
delete The self-correcting antenna of claim 1, wherein in the first mode, the metal medium is electromagnetically coupled with a self-correcting antenna such that a portion of the metal medium acts as a radiator.
According to claim 1 or claim 2, In the second mode having a ground environment that operates as an antenna in a free space or an open terminal around the antenna, the balun circuit unit and the drive element combined impedance regulator do not operate as an antenna. Self-correcting antenna that maintains pseudo-resonant properties in a grounded environment.
The self-correcting antenna according to claim 1 or 2, wherein the self-correcting antenna is designed on a card equipped with a communication module, and maintains similar resonance characteristics in different grounding environments.
The terminal of claim 7, wherein the terminal equipped with a card slot of a metal medium into which the card is inserted is electromagnetically coupled to the card slot to transmit radiant energy, and maintains similar resonance characteristics in different grounding environments. Self-correcting antenna.

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