KR101656577B1 - Antenna Including Frequency Selective Resonator - Google Patents

Abstract

An antenna comprising a frequency selective resonator is disclosed. The disclosed antenna comprises: a ground plane; A radiator positioned on the ground plane; And a frequency selective resonator located on a first side of the radiator, the frequency selective resonator being spaced apart from the ground plane and the radiator, wherein the frequency selective resonator comprises a plurality of unit cells. According to the disclosed antenna, there is an advantage that the gain of the antenna can be improved in a limited space and the beam direction can be efficiently controlled.

Description

Antenna Including Frequency Selective Resonator < RTI ID = 0.0 >

The present invention relates to an antenna, and more particularly, to an antenna including a frequency selective resonator.

The gain of the antenna is a very important parameter when it is desired to radiate the beam of the antenna with a specific directionality. A base station antenna and a satellite antenna in a mobile communication system are required to radiate a beam having a high gain in a specific direction, and various studies have been made to improve the gain of the antenna.

The most common structure among the conventional structures for improving the gain of an antenna in a specific direction is a structure using a plurality of array radiators. When the array radiator is formed and the beam pattern of each radiator is adjusted, it is possible to realize a radiation pattern having a high radiation gain in a specific direction.

However, the antenna of such a structure requires a large number of radiators and requires a phase shifter for electrical tilting of each radiator, which requires considerable cost and requires a large size.

In recent years, the environments in which the array radiators can be used in a miniaturization trend are also very limited.

On the other hand, various studies have been made to improve the gain of an antenna without using an array radiator, but studies on a structure providing a satisfactory performance in a limited space have been insufficient.

The present invention provides an antenna capable of improving gain of an antenna and controlling beam direction efficiently in a limited space.

The present invention also provides an antenna capable of improving the gain of an antenna and controlling the beam direction without using an array radiator.

In order to achieve the above object, according to an embodiment of the present invention, A radiator positioned on the ground plane; And a frequency selective resonator located on a first side of the radiator, the frequency selective resonator being spaced apart from the ground plane and the radiator, wherein the frequency selective resonator comprises a frequency selective resonator comprising a plurality of unit cells Is provided.

The antenna further includes at least one first reactive element connecting two of the plurality of unit cells.

And a variable capacitor.

The antenna further includes a second frequency selective resonator located at a second side opposite the first side of the radiator, the second frequency selective resonator being spaced apart from the ground plane and the radiator.

The second frequency selective resonator further includes a plurality of unit cells and at least one second reactive element connecting two of the plurality of unit cells.

The antenna further comprising: a third frequency selective resonator adjacent the first frequency selective resonator and located further away from the radiator than the first frequency selective resonator; And a fourth frequency selective resonator adjacent to the second frequency selective resonator and spaced further from the radiator than the second frequency selective resonator.

The first frequency selective resonator and the second frequency selective resonator operate as an internal resonator, and the third frequency selective resonator and the fourth frequency selective resonator operate as external resonators.

According to another aspect of the present invention, there is provided a semiconductor device comprising: a radiator; And a frequency selective resonator located on the first side of the radiator and spaced apart from the radiator, wherein the frequency selective resonator comprises a frequency selective resonator comprising a plurality of unit cells.

According to the antenna of the present invention, there is an advantage that the antenna gain can be improved and the beam direction can be efficiently controlled in a limited space.

1 is a perspective view illustrating a structure of an antenna including a frequency selective resonator according to a first embodiment of the present invention.
FIG. 2 is a perspective view illustrating a structure of an antenna including a frequency selective resonator according to a second embodiment of the present invention. FIG.
3 is a perspective view illustrating a structure of an antenna including a frequency selective resonator according to a third embodiment of the present invention.
4 is a conceptual diagram of a frequency selective resonator according to a second embodiment of the present invention.
5 is a graph showing changes in anti-resonance frequency according to a distance between a first frequency selective resonator and a second frequency selective resonator in an antenna according to a second embodiment of the present invention.
6 is a graph showing S11 parameters of an antenna according to a third embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

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

1 is a perspective view illustrating a structure of an antenna including a frequency selective resonator according to a first embodiment of the present invention.

Referring to FIG. 1, an antenna including a frequency selective resonator according to an embodiment of the present invention includes a ground plane 100, a radiator 110, and a frequency selective resonator 120.

The ground plane 100 is formed at the bottom of the antenna according to one embodiment of the present invention. The ground plane 100 is made of a metal material and is electrically connected to the ground to provide a ground voltage. For example, the ground plane 100 may be electrically connected to the outer core (ground connection portion) of the feed cable that provides the feed signal.

When the antenna of the present invention is used as an antenna installed in a base station, the ground plane 100 may be a reflector of a base station antenna. In the case of a terminal antenna in which the antenna of the present invention is coupled to a substrate, the ground plane 100 may be a metal plane formed on the substrate.

The radiator 110 emits an RF signal, radiates the RF signal to the outside, and receives RF signals from the outside. The radiator 110 may be formed on the ground plane and at least a portion of the radiator may be coupled to the ground plane 100. The radiator 110 may have a structure vertically erected on the ground plane, but is not limited thereto.

Referring to Figure 1, a radiator 110 of a dipole construction is shown. Of course, it should be apparent to those skilled in the art that a radiator of various structures other than a dipole radiator may be used in the present invention, and the radiator shown in Fig. 1 is merely an exemplary radiator.

The dipole radiator 110 is composed of two elements, the first element being electrically connected to the ground plane and the second element being electrically connected to the feeder line. For example, the second element connected to the feed line in the radiator 110 may be electrically connected to the feed line under the ground plane.

The frequency selective resonator 120 is installed on one side of the radiator 110. The frequency selective resonator 120 is disposed at a predetermined distance from the ground plane and supports 150 and 160 may be installed on the ground plane 100 to separate the frequency selective resonator 120 from the ground plane by a predetermined distance .

The supports 150 and 160 are made of a dielectric material, for example, an acrylic material can be used as a support.

The frequency selective resonator 120 has a configuration in which a plurality of unit cells 122 of a dielectric body 121 are arranged at predetermined intervals. The unit cell 122 is made of a metal material, and the rectangular unit cell 122 is shown in FIG. 1, but the shape of the unit cell is not limited thereto.

The frequency selective resonator 120 disposed on one side of the radiator 110 functions to improve the gain of the main beam of the radiator 110. 1, the main beam is formed in the + z direction, and the gain in the + z direction can be improved by the frequency selective resonator 120 composed of the unit cells arranged on the side of the radiator 110 have.

The radiation gain may be determined by the number of unit cells, the distance between the radiator 110 and the frequency selective resonator 120, and the size of the unit cell.

According to a preferred embodiment of the present invention, a reactive element 180, such as a capacitor and an inductor, may be coupled between the unit cells of the frequency selective resonator 120. Preferably, the reactive element 180 may be a variable capacitor.

It is possible to adjust the direction of the main beam of the radiator 110 by adjusting the inductance or the capacitance value of the reactive element 180. [ When the variable capacitor is used as the active element 180, the direction of the main beam can be controlled in a desired direction by adjusting the capacitance in the state where the antenna is installed. When a plurality of unit cells 122 are used, a plurality of the rectifier elements 180 may be coupled between unit cells, and only a single reactive element may be combined as needed.

The most commonly used structure to improve radiation gain in a particular direction is a structure using a plurality of array radiators. In order to change the direction and value of the radiation gain of the main beam in such an array radiator structure, a phase adjusting device such as a phase shifter has to be used.

However, it is possible to adjust the direction and the radiation gain of the main beam even if the array structure and the phase shifter are not used when the frequency selective resonator 120 according to the present invention is used.

1, the structure in which the radiator 110 is disposed on the ground plane 100 and the frequency selective resonator 120 is disposed apart from the ground plane 100 has been described.

The ground plane of the antenna shown in FIG. 1 is an antenna for setting the direction of the main beam in the + z direction which is the upper part of the radiator. When the direction of the main beam of the antenna is set in the + z and -z directions, the ground plane may be omitted.

2 is a perspective view illustrating the structure of an antenna including a frequency selective resonator according to a second embodiment of the present invention.

2, an antenna including a frequency selective resonator according to a second exemplary embodiment of the present invention includes a ground plane 100, a radiator 110, a first frequency selective resonator 120, and a second frequency selective resonator 130).

The antenna according to the second embodiment is a structure in which two frequency selective resonators 120 and 130 are used. In the second embodiment, the first frequency selective resonator 120 and the second frequency selective resonator 130 are installed on both sides of the radiator 110. The first frequency selective resonator 120 and the second frequency selective resonator 130 are spaced apart from the ground plane by a predetermined distance. The first frequency selective resonator 120 and the second frequency selective resonator 130 are connected to the ground plane Supports 150, 160, 170, 180 may be mounted on the ground plane 100 to provide distance separation.

The first frequency selective resonator 120 is disposed on the first side of the radiator 110 at a predetermined distance from the radiator 110 and the second frequency selective resonator 130 is disposed between the first side of the radiator 110 and the radiator 110, And is spaced a predetermined distance from the second side surface.

The first frequency selective resonator 120 and the second frequency selective resonator 130 may have a symmetrical shape or may have different shapes. However, the first frequency selective resonator 120 and the second frequency selective resonator 130 are the same in that a plurality of unit cells are arranged.

A better radiation gain can be achieved when the first frequency selective resonator 120 and the second frequency selective resonator 130 are disposed on both sides of the radiator.

A reactive element may be coupled between the unit cells of the first frequency selective resonator 120 and the second frequency selective resonator as in the first embodiment, and the reactive element may be used to control the direction of the main beam.

4 is a conceptual diagram of a frequency selective resonator according to a second embodiment of the present invention.

Fig. 4A is a conceptual view of a frequency selective resonator when a ground plane exists, and Fig. 4B is a conceptual diagram of a frequency selective resonator in a case where a ground plane is not present.

Referring to FIG. 4A, the first frequency selective resonator 120 and the second frequency selective resonator 130 are separated from each other by a predetermined distance, and the main beam is divided into a first frequency selective resonator 120 and a second frequency selective resonator 130 in the z direction.

Referring to FIG. 4B, the first frequency selective resonator 120 and the second frequency selective resonator 130 are separated from each other by a predetermined distance, and the main beam is separated from the first frequency selective resonator 120 and the second frequency selective resonator 130 in the + z direction and the -z direction.

As in the second embodiment, the structure in which the two frequency selective resonators 120 and 130 are located on both sides of the radiator uses the anti-resonance characteristic. The distance between the first frequency selective resonator 120 and the second frequency selective resonator 130 should be appropriately set in order to realize anti-resonance at a desired frequency.

The distance g ₁ between the first frequency selective resonator 120 and the second frequency selective resonator 130 for setting an appropriate anti-resonant frequency may be set as shown in Equation 1 below.

는 제1 주파수 선택 공진기(120)로부터의 반사 계수이고

은 제2 주파수 선택 공진기로부터의 반사계수이며, N은 임의의 정수이다. 예를 들어, N은 0, 1, -1 중 하나일 수 있다. In the above equation (1), c is the velocity, f is the frequency

Is a reflection coefficient from the first frequency selective resonator 120

Is the reflection coefficient from the second frequency selective resonator, and N is an arbitrary integer. For example, N may be one of 0, 1, and -1.

FIG. 5 is a diagram illustrating a change in anti-resonance frequency according to a distance between a first frequency selective resonator and a second frequency selective resonator in an antenna according to a second embodiment of the present invention.

As shown in FIG. 5, it can be seen that the anti-resonance frequency increases as the distance between the first frequency selective resonator and the second frequency selective resonator becomes shorter.

3 is a perspective view illustrating a structure of an antenna including a frequency selective resonator according to a third embodiment of the present invention.

3, an antenna including a frequency selective resonator according to a third exemplary embodiment of the present invention includes a ground plane 100, a radiator 110, a first frequency selective resonator 120, and a second frequency selective resonator 130, a third frequency selective resonator 140, and a fourth frequency selective resonator 150. [

The antenna according to the third embodiment is an antenna in which a third frequency selective resonator 140 and a fourth frequency selective resonator 150 are additionally provided as compared with the second embodiment.

The third frequency selective resonator 140 is adjacent to the outside of the first frequency selective resonator 120. The fourth frequency selective resonator 150 is located outside the second frequency selective resonator 130.

In the third embodiment, the first frequency selective resonator 120 and the second frequency selective resonator 130 operate as internal resonators, and the third frequency selective resonator 140 and the fourth frequency selective resonator 150 operate as external resonators .

The structure including the external resonator and the internal resonator together as in the third embodiment can be used to provide a good impedance matching.

Of course, it will be apparent to those skilled in the art that the number of resonators may be further increased.

6 is a graph showing S11 parameters of an antenna according to a third embodiment of the present invention.

6 shows a case where a frequency selective resonator including an external resonator and an internal resonator according to the third embodiment of the present invention, an external resonator only, and an internal resonator alone are used.

Referring to FIG. 6, when an external resonator and an external resonator are used together, it is confirmed that good impedance matching is achieved at two resonance bands, 1.7 GHz and 2.0 GHz.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (12)

Ground plane;
A radiator positioned on the ground plane; And
A first frequency selective resonator located on a first side of the radiator, the frequency selective resonator being spaced apart from the ground plane and the radiator,
Wherein the first frequency selective resonator comprises a body part made of a dielectric material and a plurality of unit cells arranged at a predetermined interval in the body part.
The method according to claim 1,
And at least one first reactive element connecting two of the plurality of unit cells. ≪ Desc / Clms Page number 13 >
3. The method of claim 2,
Wherein the active element comprises a variable capacitor. ≪ Desc / Clms Page number 21 >
The method according to claim 1,
A second frequency selective resonator located at a second side of the radiator opposite the first side, the second frequency selective resonator being spaced apart from the ground plane and the radiator. / RTI >
5. The method of claim 4,
Wherein the second frequency selective resonator further comprises a plurality of unit cells and at least one second reactive element connecting two unit cells of the plurality of unit cells, antenna.
5. The method of claim 4,
A third frequency selective resonator adjacent to the first frequency selective resonator and located further away from the emitter than the first frequency selective resonator; And
And a fourth frequency selective resonator adjacent to the second frequency selective resonator and spaced further from the radiator than the second frequency selective resonator.
The method according to claim 6,
Wherein the first frequency selective resonator and the second frequency selective resonator operate as an internal resonator and the third frequency selective resonator and the fourth frequency selective resonator operate as external resonators.
Radiators; And
And a first frequency selective resonator located on a first side of the radiator, the first frequency selective resonator being spaced apart from the radiator,
The first frequency selective resonator may include a body part made of a dielectric material and a plurality of unit cells arranged at a predetermined interval in the body part, wherein the unit cell is not electrically connected to ground and power supply And a frequency selective resonator.
9. The method of claim 8,
And at least one first reactive element connecting two of the plurality of unit cells. ≪ Desc / Clms Page number 13 >
10. The method of claim 9,
Wherein the active element comprises a variable capacitor. ≪ Desc / Clms Page number 21 >
9. The method of claim 8,
And a second frequency selective resonator located on a second side of the radiator opposite the first side.
12. The method of claim 11,
A third frequency selective resonator adjacent to the first frequency selective resonator and located further away from the emitter than the first frequency selective resonator; And
And a fourth frequency selective resonator adjacent to the second frequency selective resonator and spaced further from the radiator than the second frequency selective resonator.

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