KR20130131620A - Antenna using the absorber based on meta-structure - Google Patents

Abstract

An antenna using an absorber based on a meta-structure and an antenna for a repeater using the same are disclosed. A patch antenna of the present invention comprises a main patch, one or more electronic wave absorbers arranged around the main patch, a first resonance frequency generation unit directly connected between the input end and the output end, and a second resonance frequency generation unit connected to the output end in parallel. An effective permeability or an effective permittivity of the absorber includes a sound value in a specific frequency band. Therefore, the size of the patch antenna is minimized, and isolation between the donor antenna and the service antenna is improved.

Description

Antenna using the absorber based on meta-structure

The present invention relates to an antenna using a metastructure-based absorber, and more particularly, to an antenna that simplifies the miniaturization and fabrication process by using a metastructure having a frequency independent electrical length.

As the penetration rate of the mobile communication terminal is increased due to the development of communication technology and the desire for user's use and communication quality is increased, a repeater system is used to solve this problem. The repeater is a device for connecting the base station and the terminal in the middle to transmit the base station's radio waves more accurately and further.

The repeater system includes a donor antenna for relaying a radio signal of a base station and a relay period, and a service antenna for transmitting a signal received from the base station to a shaded area. At this time, the transmission signal of the service antenna is received by the donor antenna may cause the amplifier oscillation. Therefore, the problem of isolation of antennas to avoid oscillation is important for the development of repeaters.

Conventionally, an FSS (Frequency Selective Surface) structure is additionally installed outside the antenna to improve the isolation between the donor antenna and the service antenna. However, since the physical size of the FSS structure depends on the frequency, the miniaturization has been limited.

On the other hand, meta-material is a generic term for materials synthesized artificially to exhibit special electromagnetic properties not commonly seen in nature.

The propagation of electromagnetic waves in most materials follows the right hand rule of the (E, H, β) vector field. Here, E is an electric field, H is a magnetic field, and β is a wave vector. The phase velocity direction is the same as the direction of signal energy propagation (group velocity) and the refractive index is a positive number. Such materials are "right handed" (RH). Most natural materials are RH materials. Artificial materials may also be RH materials.

Metamaterials are artificial structures. When designed with a structural average unit cell size (p) that is much smaller than the wavelength of the electromagnetic energy guided by the meta-material, the meta-material can act as a homogeneous medium for the guided electromagnetic energy. Unlike the RH material, the metamaterial may exhibit a negative refractive index in which the relative direction of the (E, H, β) vector field is opposite to the signal energy propagation direction along the left-hand rule and the phase velocity direction. Metamaterials that support only negative refraction are "left handed" (LH) metamaterials.

Many of the metamaterials are mixtures of LH metamaterials and RH metamaterials and are therefore composite left and right handed (CRLH) metamaterials. CRLH metamaterials behave like LH metamaterials at low frequencies and behave like RH metamaterials at high frequencies. The design and properties of various CRLH metamaterials are described in Caloz and Itoh, "Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications," John Wiley & Sons (2006). CRLH metamaterials and their applications in antennas are described in Tatsuo Itoh, "Invited Papers: Prospect of Metamaterials, " Journal of the Institute of Electronics Engineers, Vol. 40, No. 16 (August 2004).

CRLH metamaterials can be used in applications where they are constructed and processed to exhibit electromagnetic properties that are made for special purposes, making it difficult, impractical, or impossible to use other materials. In addition, CRLH metamaterials can be used to develop new applications and construct new devices that are not possible with RH metamaterials.

The technical problem to be achieved by the present invention is to provide an antenna having a small and improved isolation by applying a meta-structure based absorber to the empty space of the antenna.

Patch antenna according to an embodiment of the present invention for achieving the technical problem is a main patch; And at least one radio absorber disposed around the main patch, wherein the radio absorber is a metamaterial structure-based radio absorber, the first resonance frequency generating unit being connected in series between an input terminal and an output terminal; And a second resonant frequency generator connected in parallel to the output terminal, wherein the effective dielectric constant or effective permeability of the electromagnetic wave absorber has a negative value in a specific frequency band.

The first resonant frequency generator comprises a first inductor (LR); And a first capacitor CL connected in series with the first inductor, wherein the second resonant frequency generator comprises: a second inductor LL; And a second capacitor CR connected in parallel to the second inductor.

The radio wave absorber is implemented as a flat plate, and the first capacitor CL comprises: a first polygon; And at least one coupling pattern including a second polygon located inside the first polygon.

The second inductor LL may be implemented on a surface opposite to the electromagnetic wave absorber in a circular pattern.

The first capacitor CL may include a plurality of coupling patterns; A third polygon including all of the coupling patterns; First arrows positioned in the vertical and horizontal directions between each of the coupling patterns and connected to the third polygon and directed toward the center of the third polygon; And a second arrow connecting the first polygon and the third polygon in a diagonal direction and facing the center of the third polygon in a diagonal direction, wherein the first arrow and the second arrow are in an end of the direction in which the first and third polygons face. The portion is thicker than the thickness of the first arrow and the second arrow, the pattern of the first capacitor may be symmetrical in all vertical, horizontal and diagonal directions.

The first resonant frequency generating unit includes N sub resonant frequency generating units, where N is a natural number of two or more, and each sub resonant frequency generating unit includes a first sub inductor (L / N); And a first subcapacitance N * Cg connected in series with the first sub inductor L / N, wherein the second resonant frequency generator comprises: a second inductor LL; And a second capacitor CR connected in parallel to the second inductor.

The radio wave absorber may further include a capacitor C connected in series between an output terminal and the second resonance frequency generator.

The specific frequency band may be a 2.18 GHz band.

The patch antenna may further include a parasitic patch.

In accordance with an aspect of the present invention, a repeater antenna includes: a donor antenna configured to receive a first signal from a base station; And a service antenna for transmitting a second signal based on the first signal to the outside, wherein the service antenna and the donor antenna are implemented as patch antennas, wherein the patch antenna comprises: a main patch; And at least one radio absorber disposed around the main patch, wherein the radio absorber is a metamaterial structure-based radio absorber, the first resonance frequency generating unit being connected in series between an input terminal and an output terminal; And a second resonant frequency generator connected in parallel to the output terminal, wherein the effective dielectric constant or effective permeability of the electromagnetic wave absorber has a negative value in a specific frequency band.

The donor antenna and the service antenna may be orthogonal to each other.

The patch antenna may further include a parallel stub connected in a direction perpendicular to a line connected to the main patch.

The first resonant frequency generator comprises a first inductor (LR); And a first capacitor CL connected in series with the first inductor, wherein the second resonant frequency generator comprises: a second inductor LL; And a second capacitor CR connected in parallel to the second inductor.

The radio wave absorber is implemented as a flat plate, and the first capacitor CL comprises: a first polygon; And at least one coupling pattern including at least one coupling pattern including a second polygon located inside the first polygon, and the second inductor LL is formed in a circular pattern on the opposite side of the wave absorber. Can be implemented in

The first capacitor CL may include a plurality of coupling patterns; A third polygon including all of the coupling patterns; First arrows positioned in the vertical and horizontal directions between each of the coupling patterns and connected to the third polygon and directed toward the center of the third polygon; And a second arrow connecting the first polygon and the third polygon in a diagonal direction and facing the center of the third polygon in a diagonal direction, wherein the first arrow and the second arrow are in an end of the direction in which the first and third polygons face. The portion is thicker than the thickness of the first arrow and the second arrow, the pattern of the first capacitor may be symmetrical in all vertical, horizontal and diagonal directions.

The patch antenna and the repeater antenna using the same according to the present invention can be miniaturized by applying an absorber using a meta structure having a frequency independent electric length to an empty space of an existing patch antenna, and the manufacturing process becomes easy.

In addition, the absorber absorbs surface current flowing to the outside of the antenna, thereby improving the isolation between the service antenna and the donor antenna.

1 is a top view of a patch antenna according to an embodiment of the present invention.
2 is a bottom view of a patch antenna according to an embodiment of the present invention.
3 is a view showing a top structure of the radio wave absorber shown in FIG.
4 is a view showing a bottom structure of the radio wave absorber shown in FIG.
5 is a view showing an equivalent circuit of a radio wave absorber according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an equivalent circuit of each of the electromagnetic wave absorbers shown in FIG. 1.
7 is a schematic block diagram of a repeater system in which the present invention is used.
8 is a cross-sectional view of a repeater system according to an embodiment of the present invention.
9 is a view showing a three-dimensional structure of the repeater system shown in FIG.
FIG. 10 is a diagram illustrating absorption and reflection characteristics of each of the electromagnetic wave absorbers shown in FIG. 1.
FIG. 11 is a diagram illustrating a simulation result of the repeater system illustrated in FIG. 9.
12 is a diagram illustrating a gain and a radiation pattern of a patch antenna according to an embodiment of the present invention.

Specific structural and functional descriptions of the embodiments of the present invention disclosed herein are for illustrative purposes only and are not to be construed as limitations of the scope of the present invention. And should not be construed as limited to the embodiments set forth herein or in the application.

The embodiments according to the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It is to be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first and / or second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are intended to distinguish one element from another, for example, without departing from the scope of the invention in accordance with the concepts of the present invention, the first element may be termed the second element, The second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined herein .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a top view of a patch antenna according to an embodiment of the present invention. 2 is a bottom view of a patch antenna according to an embodiment of the present invention.

1 to 2, the patch antenna 10 includes a plurality of wave absorbers 100, a main patch 200, a parallel stub 300, and an input port 400.

In the figure, the patch antenna 10 is shown as a rectangular patch for convenience of description, but the patch antenna 10 is a circular patch, a coaxial feeding patch, or an aperture coupling patch. Coupled Patch) may be implemented.

The patch antenna 10 is implemented with a FR (Frame Retadent) 4 substrate in this embodiment. FR4 substrates are GLASS EPOXY laminates and have a common dielectric constant (4.4-4.8). However, the patch antenna 10 may also be implemented as FR1, FR2, Composite Epoxy Material (CEM) -3, CEM-1, FR5 substrate, or the like.

The input port 400 receives a signal from the outside and transmits the signal to the main patch 200 through a transmission line. The main patch 200 generates polarization, and transmits a signal of a specific frequency band in which resonance occurs to the outside. The parallel stub 300 is a kind of matching circuit for matching antennas, and may adjust a frequency satisfying a voltage standing wave ratio (VSWR) characteristic by adjusting width and length.

The radio wave absorber 100 converts electrical energy of radio waves into heat energy, thereby absorbing and extinguishing radio waves to suppress interference due to radio wave interference between the donor antenna 10a and the service antenna 10b. The wave absorber 100 is formed on the FR4 substrate, is arranged around the main patch 200, and has a meta-material structure. If only one wave absorber 100 is used, only a narrow band radio signal is absorbed. However, by arranging a plurality of wave absorbers, a wide band radio signal may be absorbed. When the radio wave absorbers are arranged on the left and right sides of the patch antenna 10, the radio wave absorption can be most effectively performed. However, the radio wave absorber may be arranged on the surface of the transmission line direction D1 or the opposite direction D2.

The top surface 110 of the radio wave absorber 100 shown in FIG. 1 derives the series capacitance. The lower surface 120 of the wave absorber 100 shown in FIG. 2 leads to parallel inductance. The radio wave absorber may be realized by drawing a pattern by etching the upper and lower surfaces of the patch antenna.

3 is a view showing a top structure of the radio wave absorber shown in FIG.

The upper surface 110 of the electromagnetic wave absorber includes a coupling pattern including a first rectangle 111 and a second rectangle 113 positioned inside the first rectangle. Coupling capacitance occurs between the lines of the first rectangle and the second rectangle.

In Equation 1, the resonant frequency f ₀ is a frequency at which the radio wave absorber absorbs the radio wave at the maximum, and L and C are inductance and capacitance when the wave absorber is viewed as an equivalent circuit including one inductance and one capacitance. Value.

The resonant frequency is inversely proportional to the inductance value L and the capacitance value C. Since the inductance value is proportional to the line length, a higher capacitance value is required to realize a small absorber. Therefore, the capacitance value may be increased by using a plurality of the coupling patterns in order to obtain a higher capacitance value.

In FIG. 3, the coupling capacitance is generated as a coupling pattern in which another rectangle is included in the rectangle. However, another polygon may be used or parallel lines may be used. That is, any pattern of generating capacitance through coupling between lines is included in the scope of the present invention.

The upper surface 110 of the radio wave absorber includes a third rectangle 115 including both the first rectangle 111 and the second rectangle 113 outside the first rectangle 111 and the second rectangle 113. It may further include.

The upper surface 110 of the radio wave absorber is positioned in the vertical and horizontal directions between the coupling patterns in the third quadrangle 115 and is connected to the third quadrangle 115 to form a center of the third quadrangle. The first arrows 117 facing each other and the second arrows 119 connecting the first and third rectangles in a diagonal direction and facing the center of the third rectangle in a diagonal direction may be further included. The end portion 118 of the direction in which the first arrow and the second arrow are directed may be thicker than the thickness of the first arrow and the second arrow. At this time, the pattern of the upper surface 110 of the radio wave absorber is symmetrical in all vertical, horizontal and diagonal directions.

The third quadrangle 115, the first arrows 117, and the second arrows 119 trap the surface current flowing on the antenna surface in the absorber to improve the isolation between the donor antenna and the service antenna.

4 is a view showing a bottom structure of the radio wave absorber shown in FIG.

The lower surface 120 of the electromagnetic wave absorber may draw a pattern in a circular shape on the ground plane of the patch antenna, thereby generating parallel inductance connected between the coupling capacitance and the ground plane. At this time, the inner region 121 of the circle is not grounded, the outer region 123 of the circle is grounded.

In the present invention, a parallel inductance is generated using a circular structure of the most basic form, but patterns such as a spiral structure, a composite split ring resonator (CSSR) structure, a meander line structure, a loop structure, and the like are formed. It can also be used to generate parallel inductance. That is, any pattern of generating parallel inductance connected between the coupling capacitance and the ground plane is included in the scope of the present invention.

5 is a diagram illustrating an equivalent circuit 100-1 of a radio wave absorber according to an exemplary embodiment of the present invention.

Referring to this, the metastructure-based radio wave absorber includes a first resonance frequency generator 110a connected in series between an input terminal N1 and an output terminal N2, and a second resonance frequency generator connected in parallel with the output terminal. 120a.

The first resonant frequency generator 110a includes a first inductor LR and a first capacitor CL connected in series with the first inductor, and the second resonant frequency generator 120a includes a first inductor LR. A second inductor LL and a second capacitor CR connected in parallel to the second inductor.

In order to implement a left handed (LH) transmission line, a serial capacitance (CL) and a parallel inductance (LL) component are required. In the patterns of FIGS. 3 and 4, a series capacitance and a parallel inductance component of the radio wave absorber were implemented.

However, in the physical implementation of the LH transmission line, parasitic RH (right handed) components are generated. Therefore, the electromagnetic wave absorber may be represented as an equivalent circuit of a composite right / left-handed (CRLH) transmission line, which is a general structure including a series inductance (LR) and a parallel capacitance (CR) component constituting the RH transmission line.

In this case, the resonant frequencies of each of the first resonant frequency generator 110a and the second resonant frequency generator 120a may be the same or different.

When the effective dielectric constant or effective permeability of the radio wave absorber has a negative value in the resonance frequency band of Equation 1, the radio wave absorber has an LH characteristic and the resonance frequency of Equation 1 is independent of the physical size of the radio wave absorber. It can resonate in band.

1 to 4 illustrate one embodiment of implementing the equivalent circuit of FIG. 5, the series capacitance CL and the parallel inductance LL of FIG. 5 may be implemented in various ways, and are not limited to the above description. . That is, it may be represented by the equivalent circuit of FIG. 5, and any radio wave absorber having a negative effective dielectric constant or effective permeability in the resonance frequency band of Equation 1 is also included in the scope of the present invention.

FIG. 6 is a diagram illustrating an equivalent circuit 100-2 of each of the electromagnetic wave absorbers shown in FIG. 1.

Referring to this, the electromagnetic wave absorber has a first resonance frequency generator 110b connected in series between an input terminal N1 and an output terminal N2, and a second resonance frequency generator 120b connected in parallel with the output terminal. It includes. The first resonant frequency generator 110b and the second resonant frequency generator 120b are implemented on the top and bottom surfaces of the electromagnetic wave absorber, respectively.

The first resonance frequency generator includes N sub-resonance frequency generators, where N may be a natural number of two or more. Each sub resonant frequency generator may include a first sub inductor L / N and a first sub capacitance N * Cg connected in series with the first sub inductor L / N.

In the case where N is 2 in FIG. 6, that is, the left and right portions of the front and rear portions of the front wave absorber of FIG. A negative equivalent circuit is shown. However, each quadrant of the front surface of the electromagnetic wave absorber of FIG. 5 may be represented by a sub resonant frequency generator including a first sub inductor L / 4 and a first sub capacitance 4Cg, respectively, to draw an equivalent circuit. In other words, the equivalent circuit may be variously represented in the same embodiment.

The second resonant frequency generator 120b includes a second inductor LC and a second capacitor CC connected in parallel to the second inductor.

The radio wave absorber may further include a parasitic capacitor C connected in series between the output terminal N2 and the second resonant frequency generator 120b. The parasitic capacitor C is parasitically generated by a dielectric between an upper surface and a lower surface of the radio wave absorber.

1 to 4 illustrate one embodiment of implementing the equivalent circuit of FIG. 6, the series capacitance N * Cg and the parallel inductance Lc of FIG. 6 may be implemented in various ways, and are limited to the above description. It doesn't work. That is, it can be represented by the equivalent circuit of FIG. 8, and any radio wave absorber having a negative effective dielectric constant or effective permeability in the resonance frequency band of Equation 1 is also included in the scope of the present invention.

7 is a schematic block diagram of a repeater system to which the present invention is applied.

Referring to this, the repeater system 1 includes a donor antenna 10a, a service antenna 10b, and a relay amplifier 20. The donor antenna 10a faces the individual base stations with directionality, and the donor antenna not only transmits an amplified signal from the terminal to the base station but also receives a signal from the base station and transmits the signal to the terminal. In contrast, the service antenna 10b not only receives the uplink signal from the terminal but also transmits the downlink signal. The donor antenna 10a and the service antenna 10b are implemented with a patch antenna 10 including the radio wave absorber.

The signal of the base station received from the donor antenna 10a may be weakened or distorted during the communication process. The relay amplifier 20 may amplify the signal of the base station received from the donor antenna 10a, shape the waveform of the distorted signal, adjust or reconstruct the timing, and transmit the signal to the terminal through the service antenna 10b.

8 is a cross-sectional view of a repeater system according to an embodiment of the present invention. 9 is a view showing a three-dimensional structure of the repeater system shown in FIG.

Each of the donor antenna 10a and the service antenna 10b may further include a parasitic patch 500 to widen the antenna. In order to improve the isolation of the donor antenna 10a and the service antenna 10b, the donor antenna 10a and the service antenna 10b may be orthogonal to each other.

The relay amplifier 20 located between the donor antenna 10a and the service antenna 10b may be implemented as an aluminum jig.

FIG. 10 is a diagram illustrating absorption and reflection characteristics of the radio wave absorber illustrated in FIG. 4.

The radio absorber has an absorption rate of 94% in the 2.18 GHz band. FIG. 10 absorbs radio waves only in a narrow band using only one of the radio absorbers, but can absorb radio waves in a wide band by using a plurality of radio absorbers.

FIG. 11 is a diagram illustrating a simulation result of the repeater system illustrated in FIG. 9.

In FIG. 11, the blue line shows S-parameter characteristics of a typical patch antenna. The VSWR characteristic satisfies 2: 1 from the 1.92 GHz band to the 2.17 GHz band, and the isolation characteristic is about 60 dB. On the other hand, the red line shows the S-parameter results of the proposed antenna. Compared with the conventional antenna, the reflection characteristic is almost unchanged, while the isolation characteristic is 83 dB or less, and the isolation characteristic is improved by more than 23 dB by the meta structure-based absorber. You can check it.

In the current distribution according to the meta structure-based absorber of the repeater antenna, if there is no meta structure-based absorber, when the current is induced around the radiator and around the ground plane, the induced current flows through the aluminum jig. However, when checking the current distribution of the structure in which the meta structure-based absorber is arranged, the current is strongly induced in the meta structure-based absorber, and the current flowing to the radiator through the aluminum decreases. This current distribution improves the isolation of the repeater antenna by the metastructure-based absorber.

12 is a diagram illustrating a gain and a radiation pattern of a patch antenna according to an embodiment of the present invention. The gain of the antenna is about 6.5 dBi and shows an even radiation pattern.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Repeater system (1), donor antenna (10a),
Service antenna 10b, relay amplifier 20,
Patch antenna 10, radio wave absorber 100,
Radio wave absorber front surface (110), radio wave absorber rear surface (120),
Main patch (200), parallel stub (300),
Input port 400, first polygon 111,
Second polygon 113, third polygon 115,
The first arrow 117, the second arrow 119,
Parasitic Capacitors (130), Parasitic Patches (500)

Claims (14)

Main patch; And
At least one wave absorber disposed around the main patch,
The wave absorber is
As a metamaterial structure based radio absorber,
A first resonance frequency generator connected in series between the input terminal and the output terminal; And
A second resonance frequency generator connected in parallel to the output terminal;
An effective dielectric constant or an effective permeability of the electromagnetic wave absorber has a negative value in a specific frequency band. The method of claim 1,
The first resonant frequency generator
A first inductor; And
A first capacitor connected in series with said first inductor,
The second resonant frequency generator
A second inductor; And
And a second capacitor connected in parallel to the second inductor. The method of claim 2, wherein the radio wave absorber is implemented as a flat plate,
The first capacitor
First polygon; And
A patch antenna implemented on one side of the wave absorber in at least one coupling pattern including a second polygon located inside the first polygon. The method of claim 3, wherein the second inductor
Patch antenna implemented on the opposite side of the wave absorber in a circular pattern. The method of claim 3, wherein the first capacitor
A plurality of said coupling patterns;
A third polygon including all of the coupling patterns;
First arrows positioned in the vertical and horizontal directions between each of the coupling patterns and connected to the third polygon and directed toward the center of the third polygon; And
The first polygon and the third polygon are connected in a diagonal direction, and is implemented in a pattern including second arrows facing the center of the third polygon in a diagonal direction,
The first arrow and the second arrow is thicker than the thickness of the first arrow and the second arrow at the end of the direction facing,
And the pattern of the first capacitor is symmetrical in all of the vertical, horizontal and diagonal directions. The method of claim 1, wherein the first resonant frequency generator
N sub-resonance frequency generating unit, N is a natural number of 2 or more,
Each sub resonance frequency generator
A first sub inductor L / N; And
A first sub capacitance N * Cg connected in series with the first sub inductor L / N,
The second resonant frequency generator
Second inductor LL; And
A patch antenna comprising a second capacitor (CR) connected in parallel to the second inductor. The method of claim 6, wherein the radio wave absorber
The patch antenna further comprises a capacitor (C) connected in series between the output terminal and the second resonant frequency generator. The method of claim 1, wherein the patch antenna
A patch antenna further comprising a parasitic patch. In the repeater antenna,
A donor antenna for receiving a first signal from a base station; And
A service antenna for transmitting a second signal based on the first signal to the outside;
The service antenna and the donor antenna are implemented as a patch antenna,
The patch antenna
Main patch; And
At least one wave absorber disposed around the main patch,
The wave absorber is
As a metamaterial structure based radio absorber,
A first resonance frequency generator connected in series between the input terminal and the output terminal; And
A second resonance frequency generator connected in parallel to the output terminal;
The effective dielectric constant or effective permeability of the radio wave absorber has a negative value in a specific frequency band antenna. The method of claim 9, wherein the donor antenna and the service antenna
Repeater antennas located perpendicular to each other. The method of claim 9, wherein the patch antenna
The repeater antenna further comprising a parallel stub (shunt stub) connected in a direction perpendicular to the track connected to the main patch. 10. The method of claim 9, wherein the first resonant frequency generator
A first inductor; And
A first capacitor connected in series with said first inductor,
The second resonant frequency generator
A second inductor; And
And a second capacitor connected in parallel to the second inductor. The method of claim 12, wherein the radio wave absorber is implemented as a flat plate,
The first capacitor
First polygon; And
At least one coupling pattern including a second polygon located inside the first polygon is implemented on one side of the wave absorber,
The second inductor is
Repeater antenna is implemented on the opposite side of the wave absorber in a circular pattern. The method of claim 13, wherein the first capacitor
A plurality of said coupling patterns;
A third polygon including all of the coupling patterns;
First arrows positioned in the vertical and horizontal directions between each of the coupling patterns and connected to the third polygon and directed toward the center of the third polygon; And
The first polygon and the third polygon are connected in a diagonal direction, and is implemented in a pattern including second arrows facing the center of the third polygon in a diagonal direction,
The first arrow and the second arrow
At the end of the facing direction is thicker than the thickness of the first arrow and the second arrow,
The pattern of the first capacitor is
Repeater antennas symmetric in all vertical, horizontal and diagonal directions.

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