KR102246561B1 - Antenna changeable polratization direction - Google Patents

Abstract

Disclosed is an antenna capable of changing a polarization direction with a simple structure. The antenna includes a power supply unit formed on one surface of the substrate, a first radiator arranged on one surface of the substrate and connected to the power supply unit, a second radiator arranged on one surface of the substrate and electrically connected to the first radiator, and the other surface of the substrate Includes grounds arranged in. Here, a first diode is formed between one surface of the first radiator and one surface of the second radiator, a second diode is formed between the other surface of the first radiator and the other surface of the second radiator, and the diodes are complementary. It is switched as an enemy.

Description

An antenna that can change the polarization direction {ANTENNA CHANGEABLE POLRATIZATION DIRECTION}

The present invention relates to an antenna capable of changing a polarization direction using a diode.

Compared to the linear polarized antenna, the circular polarized antenna has the advantage of less polarization mismatch and stable communication between the transceivers.

In particular, a polarization reconstruction antenna with a polarization switching function between right handed circular polarization (RHCP) and left handed circular polarization (LHCP) has appeared, but the existing antenna is very bulky and very complicated to manufacture. . In addition, there is a possibility of causing a trunk line with other wireless communication systems.

KR 10-2008-0026720 A

The present invention is to provide an antenna capable of varying the polarization direction with a simple structure.

In order to achieve the object as described above, the antenna according to an embodiment of the present invention includes a power supply unit formed on one surface of a substrate; A first radiator arranged on one surface of the substrate and connected to the power supply unit; A second radiator arranged on one surface of the substrate and electrically connected to the first radiator; And a ground arranged on the other surface of the substrate. Here, a first diode is formed between one surface of the first radiator and one surface of the second radiator, a second diode is formed between the other surface of the first radiator and the other surface of the second radiator, and the diodes are complementary. It is switched as an enemy.

An antenna according to another embodiment of the present invention includes a power supply unit formed on one surface of a substrate; A first radiator arranged on one surface of the substrate and connected to the power supply unit; A second radiator arranged on one surface of the substrate and electrically connected to the first radiator; And a ground arranged on the other surface of the substrate. Here, a current path is formed from the first radiator to one end of the second radiator according to the power supply through the power supply unit to generate a first circular polarization, and power supply through the power supply unit according to a polarization direction control command Accordingly, a current path is formed from the first radiator to the other end of the second radiator to generate a second circular polarized wave in a direction different from that of the first circular polarized wave.

In the antenna of the present invention, a first diode is formed between one surface of the first radiator and one surface of the second radiator, and a second diode is formed between the other surface of the first radiator and the other surface of the second radiator, and the diodes are complementary. By switching as an alternative, the direction of the circular polarization can be changed.

1 is a diagram illustrating a polarization reconstructed monopole antenna according to an embodiment of the present invention.
2 is a diagram showing the flow of current according to the polarization direction.
3 and 4 are diagrams showing experimental results of reflection coefficient and axis ratio.
5 is a diagram showing measurement values of gain and radiation efficiency of an antenna.
6 is a diagram illustrating a radiation pattern of the antenna of FIG. 1.

Singular expressions used in the present specification include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various elements or various steps described in the specification, and some of the elements or some steps It may not be included, or it should be interpreted that it may further include additional components or steps. In addition, terms such as "... unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. .

The present invention relates to a polarization reconstruction monopole antenna, and the direction of a circular polarization can be changed using a diode. As a result, it is possible to minimize interference with other wireless communication systems.

In addition, the antenna may implement a polarization multi-band using a parasitic loop element.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a polarization reconstructed monopole antenna according to an embodiment of the present invention, FIG. 2 is a diagram showing a current flow according to a polarization direction, and FIGS. 3 and 4 are experimental results of reflection coefficient and axis ratio These are drawings showing. 5 is a diagram illustrating a gain measurement value and a radiation efficiency of an antenna, and FIG. 6 is a diagram illustrating a radiation pattern of the antenna of FIG. 1.

Referring to FIG. 1, the polarization reconstructed monopole antenna of the present embodiment is an antenna capable of changing a polarization direction, and may include a substrate 100, a power supply unit 110, radiators 112, and a ground 120. .

Particularly, the antenna of the present invention generates circular polarization and can change the circular polarization to minimize interference with other wireless communication systems.

The power supply unit 110 is arranged on one surface of the substrate 100 and supplies power supplied from an external power source to the first radiator 112a.

The first radiator 112a is arranged on one surface of the substrate 100, is directly connected to the power supply unit 110, and may generate circular polarization. Meanwhile, a broadband pattern, for example, a λ/4 pattern may be formed between the power supply unit 110 and the first radiator 112a.

The second radiator 112b is arranged on one surface of the substrate 100 and may be electrically connected to the first radiator 112a while being spaced apart from the first radiator 112a. For example, power may be coupled from the first radiator 112a and supplied to the second radiator 112b.

According to an embodiment, the first radiator 112a may have a rectangular shape, the second radiator 112b has a rectangular shape in a state spaced apart from the first radiator 112a, and the first radiator 112a and The second radiator 112b may have a rhombus shape. Here, the center of the second radiator 112b is empty.

In addition, one surface of the second radiator 112b may face one surface of the first radiator 112a, and the other surface of the second radiator 112b may face the other surface of the first radiator 112a.

According to an embodiment, a first diode D1 is formed between one surface of the first radiator 112a and one surface of the second radiator 112b, and the other surface of the first radiator 112a and the second radiator 112b A second diode D2 may be formed between the other surfaces of. In this case, the anode of the first diode D1 may face the first radiator 112a, while the anode of the second diode D2 may face the second radiator 112b. That is, the diodes D1 and D2 may be arranged symmetrically left and right.

According to an embodiment, the controller (not shown) may change the polarization direction of the circular polarization by switching the diodes D1 and D2.

Specifically, the control unit may control and switch the voltage across the first diode D1, and may control and switch the voltage across the second diode D2. For example, the first diode D1 may be activated (ON) by applying a forward voltage to the first diode D1, and the second diode D2 may be deactivated (OFF) by applying a reverse voltage.

According to an embodiment, the first diode D1 and the second diode D2 may perform a complementary switching operation. For example, when the first diode D1 is activated, the second diode D2 may be deactivated. Using this method, the direction of polarization can be varied.

In the structure of FIG. 1, when the first diode D1 is activated and the second diode D2 is deactivated, as shown in ② of FIG. 2, the current flows through the first radiator 112a and the first diode D1. It may flow to the end of the second radiator 112b. In this case, left handed circular polarization (LHCP) may be radiated.

On the other hand, when the first diode D1 is deactivated and the second diode D2 is activated, as shown in ① of FIG. 2, the current is transmitted through the first radiator 112a and the second diode D2. It may flow to the end of the radiator 112b. In this case, right handed circular polarization (RHCP) may be radiated.

That is, the polarization direction of the radiation pattern may be changed by switching the diodes D1 and D2.

Meanwhile, the connection between the first radiator 112a and the second radiator 112b was switched using diodes D1 and D2 above, but the connection between the first radiator 112a and the second radiator 112b was swung. It is not limited to the diodes D1 and D2 as far as it can be called.

The parasitic radiator 112c is formed along the circumference of the first radiator 112a and the second radiator 112b, that is, formed around the rhombus, and is coupled to the first radiator 112a and the second radiator 112b. I can. This parasitic radiator 112c may also generate circular polarization to implement multiple bands.

That is, the radiators 112a to 112c generate three circular polarizations.

The ground 120 is formed on a surface of the substrate 100 opposite to the surface on which the radiators 112a to 112c are arranged.

According to an embodiment, the notch 130 is additionally formed in the ground 120 to increase the impedance bandwidth to include all axial ratio bands. The notch 130 may be formed above the ground 120.

In summary, the polarization reconstructed monopole antenna of the present embodiment generates circular polarization, but can change the direction of the circular polarization. In addition, the antenna can reduce the size of the transmission/reception system and minimize interference between the transmission/reception systems while implementing multiple bands. This operation can be seen in FIGS. 4 to 6.

Meanwhile, the constituent elements of the above-described embodiment can be easily grasped from a process point of view. That is, each component can be identified as a respective process. In addition, the process of the above-described embodiment can be easily grasped from the viewpoint of the components of the device.

The above-described embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art who have ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. It should be seen as falling within the scope of the following claims.

100: substrate 110: power supply
112: radiator 120: ground
130: notch

Claims (6)

A power feeding part formed on one surface of the substrate;
A first radiator arranged on one surface of the substrate and connected to the power supply unit;
A second radiator arranged on one surface of the substrate and electrically connected to the first radiator; And
Including a ground arranged on the other surface of the substrate,
A first diode is formed between one surface of the first radiator and one surface of the second radiator, a second diode is formed between the other surface of the first radiator and the other surface of the second radiator, and the diodes are complementary The direction of the circular polarization changes as the diodes that operate and operate complementarily are switched,
The first radiator and the second radiator have a rhombus shape, the inside of the second radiator is empty, and the first diode has an anode facing the first radiator, whereas the second diode has an anode of the second radiator. An antenna facing the radiator, wherein a reverse voltage is applied to the second diode while a forward voltage is applied to the first diode. delete The method of claim 1,
And a parasitic radiator arranged around the first radiator and the second radiator and coupled to each other. delete The antenna of claim 1, wherein the antenna is a polarization reconstructed monopole antenna, and a notch is formed in the ground.





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