KR101927954B1 - Beamforming antenna - Google Patents

Beamforming antenna Download PDF

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Publication number
KR101927954B1
KR101927954B1 KR1020170091499A KR20170091499A KR101927954B1 KR 101927954 B1 KR101927954 B1 KR 101927954B1 KR 1020170091499 A KR1020170091499 A KR 1020170091499A KR 20170091499 A KR20170091499 A KR 20170091499A KR 101927954 B1 KR101927954 B1 KR 101927954B1
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KR
South Korea
Prior art keywords
antenna
beamforming
substrate
antennas
circuit
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KR1020170091499A
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Korean (ko)
Inventor
성원모
김의선
김기호
최세아
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주식회사 이엠따블유
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Priority to KR1020170091499A priority Critical patent/KR101927954B1/en
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Publication of KR101927954B1 publication Critical patent/KR101927954B1/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/16Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285Planar dipole

Abstract

A beam-forming antenna is disclosed. The beam-forming antenna includes: an array antenna part including a plurality of antennas; a beam forming circuit part connected to the plurality of antennas and distributing a signal transmitted through the antenna; a diversity module coupled to the beam-forming circuit part and diversifying the signal; a control part for controlling the diversity module; and an input/output part connected to the diversity module. The performance of the antenna can be increased.

Description

[0001] BEAM FORMING ANTENNA [0002]

The present invention relates to a beam-forming antenna, and more particularly, to a beam-forming antenna that can improve antenna performance through a directivity characteristic and is miniaturized as compared with a conventional beam-forming antenna.

As the information age comes, the type of communication is evolving into high - speed wireless communication, which exchanges large - volume multimedia data including media, voice, and images. In a classical transmission wireless network, the quality, security, reliability and high-speed transmission ratio of the communication service may vary depending on the method of communication. Beam-forming technology has been attracting attention in order to provide a high-quality communication service that can exchange large amounts of data in accordance with the above-described change in communication environment.

The smart antenna scheme based on the beamforming scheme can be classified into a switched beam smart antenna and an adaptive beam smart antenna. The fixed beam selection method uses a fixed beam pattern of the antenna. If the user is positioned between the antenna pattern and the pattern, the fixed beam selection method may have a decreased performance. On the other hand, the adaptive beam method has an advantage that it can change the pattern of the antenna according to the time or the surrounding environment, adapt to the environment more intelligently than the fixed beam, and form a beam directly to the user .

However, there is a difficulty in providing a highly integrated beam-forming device due to the limitation on the size of a device used for beam-forming. Therefore, many researches are being conducted to realize a highly integrated beam-forming communication module by implementing a miniaturized beam-forming device. In the case of the conventional beam-forming antenna, there is a problem in that the size of the beam-forming antenna is very large because four directional antennas are selected.

Korean Patent Publication No. 10-2011-0088176 (August 23, 2011)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a beamforming antenna with improved omnidirectional performance and miniaturized compared to existing beamforming antennas.

According to an aspect of the present invention, there is provided a beamforming antenna including: an array antenna including a plurality of antennas; A beam forming circuit unit connected to the plurality of antennas and distributing a signal transmitted through the antenna; A diversity module coupled to the beamforming circuitry for diversifying the signal; A control unit for controlling the diversity module; And an input / output unit connected to the diversity module.

According to another aspect of the present invention, there is provided a beamforming antenna including: an array antenna including a plurality of antennas; A beam forming circuit unit connected to the plurality of antennas and distributing a signal transmitted through the antenna; A switching module connected to the beam forming circuit and switching the signal; A control unit for controlling the switching module; And an input / output unit connected to the switching module.

In one embodiment, the plurality of antennas includes a first antenna, a second antenna, a third antenna and a fourth antenna, and the beam forming circuit portion includes a first beam forming circuit and a second beam forming circuit The first antenna and the third antenna are connected to the first beam forming circuit, and the second antenna and the fourth antenna are connected to the second beam forming circuit.

In one embodiment, the first antenna, the second antenna, the third antenna, and the fourth antenna are disposed on one substrate, and the first antenna, the third antenna, the second antenna, And the first antenna, the second antenna, the third antenna, and the fourth antenna are disposed at an interval of 90 degrees from each other with respect to the center of the substrate.

In one embodiment, the first antenna and the third antenna are spaced from each other by a distance of 0.15 to 0.35 times a first wavelength corresponding to a maximum operating frequency of the beam-forming antenna.

In one embodiment, the second antenna and the fourth antenna are spaced from each other by a distance of 0.15 to 0.35 times a first wavelength corresponding to a maximum operating frequency of the beam-forming antenna.

In one embodiment, the operating frequency may be between 470 and 800 MHz.

In one embodiment, the first beamforming circuit and the second beamforming circuit are each a hybrid coupler, the hybrid coupler has two input terminals and two output terminals, and the two outputs / RTI > can have a phase difference of? / 2 to 3? / 2.

In one embodiment, the first antenna, the second antenna, the third antenna, and the fourth antenna may be CPW (coplanar waveguide) dipole antennas.

In one embodiment, the first antenna, the third antenna, and the first beamforming circuit are disposed on a first substrate, and the second antenna, the fourth antenna, and the second beamforming circuit are disposed on a second substrate And the first substrate and the second substrate may have a laminated structure.

In one embodiment, the beamforming antenna may be a digital TV antenna.

As described above, the beamforming antenna of the present invention can be downsized and the performance of the antenna can be improved by utilizing the directivity characteristic of the antenna through diversity or switching using a plurality of antennas.

The present invention can be miniaturized as compared with conventional beam-forming antennas, and thus can be optimized for high integration.

The present invention minimizes loss because there is no phase shift circuit used in conventional beamforming antennas.

In the present invention, a diversity gain can be obtained by using four different antennas.

FIG. 1A is a conceptual diagram illustrating a beamforming antenna according to an embodiment of the present invention. FIG.
1B is a view for explaining the configuration of the beam-forming antenna of FIG. 1A.
2A is a conceptual diagram illustrating a beamforming antenna according to another embodiment of the present invention.
FIG. 2B is a diagram for explaining the configuration of the beam-forming antenna of FIG. 2A.
3A is a view for explaining an antenna arrangement of a first substrate and a second substrate according to an embodiment of the present invention.
3B is a view for explaining a lamination structure of a first substrate and a second substrate according to an embodiment of the present invention.
4 is a result of measuring the VSWR of the beam-forming antenna according to the embodiment of the present invention.
5A to 5D are measurement results of the radiation characteristics of the first to fourth antennas according to the embodiment of the present invention.
6A to 6D are measurement results of radiation characteristics according to frequency of a second antenna according to an 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.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Wherein like reference numerals refer to like elements throughout.

FIG. 1A is a conceptual view for explaining a beam-forming antenna according to an embodiment of the present invention, FIG. 1B is a view for explaining a configuration of a beam-forming antenna of FIG. 1A, FIG. 3B is a view for explaining the stacking structure of the first substrate and the second substrate according to the embodiment of the present invention. FIG.

1A and 1B, a beam-forming antenna 1000 according to an embodiment of the present invention includes an array antenna unit 110, a beam forming circuit unit 120, a diversity module 130, a control unit 140, / Output unit 150, as shown in FIG.

The array antenna unit 110 may include a plurality of antennas. For example, the plurality of antennas may include a first antenna 112, a second antenna 114, a third antenna 116, and a fourth antenna 118. For example, a non-directional antenna may be used as the first antenna 112, the second antenna 114, the third antenna 116 and the fourth antenna 118, and a coplanar waveguide (CPW) dipole antenna a dipole antenna may be used as the first antenna 112, the second antenna 114, the third antenna 116 and the fourth antenna 118, respectively.

The first antenna 112, the second antenna 114, the third antenna 116, and the fourth antenna 118 may be used as transmit / receive antennas, but are preferably used as antennas for receiving digital TV signals.

For example, the first antenna 112, the second antenna 114, the third antenna 116, and the fourth antenna 118 are disposed on one substrate, and the first antenna 112 and the third antenna 116 And the second antenna 114 and the fourth antenna 118 may be disposed so as to face each other. The first antenna 112, the second antenna 114, the third antenna 116, and the fourth antenna 118 may be disposed at intervals of 90 degrees with respect to the center of the substrate. This is because the beam-forming antenna 1000 according to the embodiment of the present invention is an omnidirectional antenna for receiving digital TV signals and exhibits excellent performance at an operating frequency of 470 to 800 MHz.

The substrate for miniaturization may be a PCB substrate having a size of 150 mm x 150 mm and the array antenna unit 110, the beam forming circuit unit 120 and the diversity module 130 may be mounted on one surface of the substrate And the control unit 140 and the input / output unit 150 may be disposed on the other surface opposite to the one surface of the substrate.

For example, the first antenna 112 and the third antenna 116 are spaced 0.15 to 0.35 times the first wavelength corresponding to the maximum operating frequency of the beamforming antenna 1000, and the second antenna 114 and The fourth antenna 118 is preferably spaced a distance of 0.15 to 0.35 times the first wavelength corresponding to the maximum operating frequency of the beamforming antenna 1000. This is an antenna for receiving a digital TV signal so as to exhibit excellent performance at an operating frequency of 470 to 800 MHz and at the same time to achieve miniaturization of the beam forming antenna 1000.

3A and 3B, a first antenna 112, a third antenna 116, and a first beamforming circuit 122 are disposed on a first substrate 20, and a second antenna (not shown) The first substrate 20 and the second substrate 10 may have a stacked structure. The first substrate 20 and the second substrate 10 may have a stacked structure, have. In order to miniaturize the beam-forming antenna 1000, the laminated structure is disadvantageous. However, since the performance of the beam-forming antenna 1000 is also important, a laminated structure as shown in FIG. 3B is employed in order to secure a better antenna performance It is possible.

The beam forming circuit unit 120 is connected to a plurality of antennas and can distribute a signal transmitted through the antenna. The beamforming circuit portion 120 includes a first beamforming circuit 122 and a second beamforming circuit 124. The first antenna 112 and the third antenna 116 are connected to a first beamforming circuit 122 and the second antenna 114 and the fourth antenna 118 are connected to the second beam forming circuit 124. [ It is possible to improve the reception performance of the antenna by directing the antenna in a direction in which the signal is strongly incident through the beam forming circuit unit 120 and to activate all four antennas 112, 114, 116, .

The first beamforming circuit 122 and the second beamforming circuit 124 are hybrid couplers and the hybrid couplers 122 and 124 each have two input terminals and two output terminals, The phase difference of the two outputs may be between? / 2 and 3? / 2. For example, the outputs of the first antenna 112 and the third antenna 116 may be respectively coupled to the two inputs of the first beamforming circuit 122 and the outputs of the second antenna 114 and the fourth antenna 118 May be coupled to two inputs of a second beamforming circuit 124, respectively.

The diversity module 130 is connected to the beam forming circuit unit 120 and is capable of diversifying the signal. The signal may be a signal transmitted through an antenna or a signal received through an antenna when used as an antenna for receiving a digital TV signal.

In order to reduce the influence of fading, diversity is a reception method in which a plurality of reception signals having different electric field intensities or signal to noise ratios (S / N) are combined or changed to obtain a single signal output. Incident angle, and the like may be combined, or a combination of these may be performed.

The control unit 140 may control the diversity module 130. [ For example, the controller 140 may control the diversity module in the following three ways.

The first method is a DOA (Direction of Arrival) based algorithm. In this method, the direction of incidence of the signal is first detected by using a direction detection algorithm, and beam forming is performed on the detected direction. The second scheme is a training sequence based algorithm, which obtains a beam pattern based on a training sequence, that is, a previously known signal. These training sequence-based algorithms include SMI (Sample Matrix Inversion), LMS (Least Means Square), and RLS (Recursive Least Square). The third scheme is a blind smart antenna algorithm, which determines a beam pattern using only the characteristics of a signal without using a training sequence. The performance of the beamforming antenna can be improved by appropriately performing beamforming through such a method.

The input / output unit 150 may be connected to the diversity module 130. For example, the input / output unit 150 may be an RF connector and may be an SMA mount type. For example, a signal received through the diversity module 130 may be received on the digital TV through the input / output unit 150.

For example, the array antenna unit 110, the beam forming circuit unit 120, the diversity module 130, the control unit 140, and the input / output unit 150 may be connected through an RF cable.

The gain of the beamforming antenna 1000 according to the embodiment of the present invention may have a value of -2 dBi to 0 dBi (typical).

FIG. 2A is a conceptual view for explaining a beamforming antenna according to another embodiment of the present invention, and FIG. 2B is a view for explaining a configuration of the beamforming antenna of FIG. 2A.

2A and 2B, a beamforming antenna 2000 according to another embodiment of the present invention includes an array antenna unit 210, a beam forming circuit unit 220, a switching module 230, a control unit 240, And an output unit 250. [

The array antenna unit 210 may include a plurality of antennas. For example, the plurality of antennas may include a first antenna 212, a second antenna 214, a third antenna 216, and a fourth antenna 218. For example, a non-directional antenna may be used as the first antenna 212, the second antenna 214, the third antenna 216, and the fourth antenna 218, and a coplanar waveguide (CPW) a dipole antenna may be used as the first antenna 212, the second antenna 214, the third antenna 216, and the fourth antenna 218, respectively.

The first antenna 212, the second antenna 214, the third antenna 216, and the fourth antenna 218 may be used as transmit / receive antennas, but are preferably used as antennas for receiving digital TV signals.

For example, the first antenna 212, the second antenna 214, the third antenna 216, and the fourth antenna 218 are disposed on one substrate, and the first antenna 212 and the third antenna 216 And the second antenna 214 and the fourth antenna 218 may be arranged to face each other. The first antenna 212, the second antenna 214, the third antenna 216, and the fourth antenna 218 may be disposed at intervals of 90 ° from each other with respect to the center of the substrate. This is because the beam-forming antenna 2000 according to another embodiment of the present invention is an omnidirectional antenna for receiving digital TV signals and exhibits excellent performance at an operating frequency of 470 to 800 MHz.

The substrate for miniaturization may be a PCB substrate having a size of 150 mm x 150 mm and the array antenna unit 210, the beam forming circuit unit 220 and the diversity module 230 may be mounted on one surface of the substrate in order to minimize external interference. And the control unit 240 and the input / output unit 250 may be disposed on opposite sides of one side of the substrate.

The first antenna 212 and the third antenna 216 are separated from each other by a distance of 0.15 to 0.35 times the first wavelength corresponding to the maximum operating frequency of the beamforming antenna 2000, The fourth antenna 218 is preferably spaced 0.15 to 0.35 times the first wavelength corresponding to the maximum operating frequency of the beamforming antenna 2000. This is an antenna for receiving a digital TV signal so as to exhibit excellent performance at an operating frequency of 470 to 800 MHz and to achieve miniaturization of the beam forming antenna 2000.

3A and 3B, the first antenna 212, the third antenna 216, and the first beamforming circuit 222 are formed on the first substrate 20, The second antenna 214, the fourth antenna 218 and the second beam forming circuit 224 are disposed on the second substrate 10 and the first substrate 20 and the second substrate 10 ) May have a laminated structure.

The beamforming circuit unit 220 is connected to a plurality of antennas, and can distribute a signal transmitted through the antenna. For example, the beamforming circuitry 220 includes a first beamforming circuit 222 and a second beamforming circuit 224, wherein the first antenna 212 and the third antenna 216 are coupled to a first beamforming circuit 222 and the second antenna 214 and the fourth antenna 218 are connected to the second beamforming circuit 224. The reception performance of the antenna can be improved by orienting the antenna in the direction in which the signal is strongly incident through the beam forming circuit 214. [

The first beam-forming circuit 222 and the second beam-forming circuit 224 are hybrid couplers, and the hybrid couplers 222 and 224 have two input terminals and two output terminals, respectively. The phase difference of the two outputs may be between? / 2 and 3? / 2. The output of the first antenna 212 and the output of the third antenna 216 may be coupled to the two inputs of the first beamforming circuit 222 and the output of the second antenna 214 and the output of the fourth antenna 218, May be coupled to two inputs of a second beamforming circuit 224, respectively.

The switching module 230 is connected to the beam forming circuit unit 220 and can switch the signal. The signal may be a signal transmitted through an antenna or a signal received through an antenna when used as an antenna for receiving a digital TV signal. The switching module 230 can direct one of the four antennas 212, 214, 216, and 218 to be activated so that the beam forming circuit 214 directs the antenna in a direction in which the signal is strongly incident, Can be improved. For example, as the switching module 230, a SP4T (Single Pole 4 Throw) switch among RF switches may be used.

The control unit 240 may control the switching module 230. For example, the control unit 240 may control the switching module 230 by connecting only one input port of the switching module 230 and one output port of the four output ports so as to be electrically communicable.

The input / output unit 250 may be connected to the switching module 230. For example, the input / output unit 250 may be an RF connector and may be an SMA mount type. For example, a signal received through the switching module 230 may be received on the digital TV through the input / output unit 250.

For example, the array antenna unit 210, the beam forming circuit unit 220, the switching module 230, the control unit 240, and the input / output unit 250 may be connected through an RF cable.

The gain of the beamforming antenna 2000 according to another embodiment of the present invention may have a value of -2.5 dBi to -0.5 dBi (typical).

4 is a result of measuring the VSWR of the beam-forming antenna according to the embodiment of the present invention.

4, the VSWR1 of the first antenna 112, the VSWR2 of the second antenna 114, the VSWR3 of the third antenna 116, and the VSWR3 of the fourth antenna 118 (VSWR4) exhibits the same characteristics, and it can be confirmed that the performances of the four antennas are all good.

5A to 5D are measurement results of the radiation characteristics of the first to fourth antennas according to the embodiment of the present invention.

5A and 5B, both the first antenna 112, the second antenna 114, the third antenna 116, and the fourth antenna 118 are excellent in radiation characteristics and directivity, and four It is possible to have different radiation patterns by arranging the antennas to be orthogonal to each other.

6A to 6D are measurement results of radiation characteristics according to frequency of a second antenna according to an embodiment of the present invention.

6A to 6D, it can be seen that there is no significant change in the radiation characteristic and the directivity within the operating frequency range, and it can be seen that there is no significant difference in performance within the operating frequency range according to the frequency change.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

1000, 2000: beam-forming antenna 110, 210: array antenna unit
120, 220: beam forming circuit unit 130: diversity module
230: switching module 140, 240:
150, 250: input / output section

Claims (11)

  1. An array antenna unit including a plurality of antennas;
    A beam forming circuit unit connected to the plurality of antennas and distributing a signal transmitted through the antenna;
    A diversity module coupled to the beamforming circuitry for diversifying the signal;
    A control unit for controlling the diversity module; And
    And an input / output unit connected to the diversity module,
    Wherein the plurality of antennas includes a first antenna, a second antenna, a third antenna, and a fourth antenna,
    The first antenna, the second antenna, the third antenna, and the fourth antenna are disposed on one substrate,
    The first antenna, the third antenna, the second antenna, and the fourth antenna are arranged to face each other,
    Wherein the first antenna, the second antenna, the third antenna, and the fourth antenna are disposed at 90 DEG intervals from each other with respect to the center of the substrate.
  2. An array antenna unit including a plurality of antennas;
    A beam forming circuit unit connected to the plurality of antennas and distributing a signal transmitted through the antenna;
    A switching module connected to the beam forming circuit and switching the signal;
    A control unit for controlling the switching module; And
    And an input / output unit connected to the switching module,
    Wherein the plurality of antennas includes a first antenna, a second antenna, a third antenna, and a fourth antenna,
    The first antenna, the second antenna, the third antenna, and the fourth antenna are disposed on one substrate,
    The first antenna, the third antenna, the second antenna, and the fourth antenna are arranged to face each other,
    Wherein the first antenna, the second antenna, the third antenna, and the fourth antenna are disposed at 90 DEG intervals from each other with respect to the center of the substrate.
  3. 3. The apparatus according to claim 1 or 2, wherein the beam forming circuit section
    A first beamforming circuit and a second beamforming circuit,
    Wherein the first antenna and the third antenna are connected to the first beamforming circuit,
    And the second antenna and the fourth antenna are connected to the second beamforming circuit.
  4. delete
  5. The method of claim 3,
    Wherein the first antenna and the third antenna comprise:
    Wherein the beamforming antenna is spaced a distance of 0.15 to 0.35 times the first wavelength corresponding to a maximum operating frequency of the beamforming antenna.
  6. 6. The method of claim 5,
    Wherein the second antenna and the fourth antenna comprise:
    Wherein the beamforming antenna is spaced a distance of 0.15 to 0.35 times the first wavelength corresponding to a maximum operating frequency of the beamforming antenna.
  7. The method according to claim 6,
    The operating frequency may be,
    470 to 800 MHz.
  8. The method of claim 3,
    Wherein the first beamforming circuit and the second beamforming circuit are hybrid couplers,
    Wherein the hybrid coupler has two input terminals and two output terminals, and the phase difference between the two outputs output from the output terminal is in a range of? / 2 to 3? / 2.
  9. The method of claim 3,
    Wherein the first antenna, the second antenna, the third antenna, and the fourth antenna are coplanar waveguide (CPW) dipole antennas, respectively.
  10. The method of claim 3,
    Wherein the first antenna, the third antenna, and the first beamforming circuit are disposed on a first substrate,
    Wherein the second antenna, the fourth antenna, and the second beamforming circuit are disposed on a second substrate,
    Wherein the first substrate and the second substrate have a laminated structure.
  11. The method of claim 3,
    Wherein the beam-forming antenna is a digital TV antenna.
KR1020170091499A 2017-07-19 2017-07-19 Beamforming antenna KR101927954B1 (en)

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KR1020170091499A KR101927954B1 (en) 2017-07-19 2017-07-19 Beamforming antenna
PCT/KR2018/008022 WO2019017661A1 (en) 2017-07-19 2018-07-16 Beam-forming antenna

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101140283B1 (en) * 2010-12-14 2012-04-27 주식회사 이노링크 Hybrid diversity antenna

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EP1952484A1 (en) * 2005-11-24 2008-08-06 Thomson Licensing Antenna arrays with dual circular polarization
KR101093365B1 (en) * 2006-09-27 2011-12-14 엘지전자 주식회사 Internal Antenna Apparatus for Multi-In Multi-Out and Diversity Function
DE102007011636A1 (en) * 2007-03-09 2008-09-11 Lindenmeier, Heinz, Prof. Dr. Ing. Antenna for radio reception with diversity function in a vehicle
KR101057092B1 (en) * 2008-12-04 2011-08-17 (주)가람솔루션 Beautiful / diversity internal antenna system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101140283B1 (en) * 2010-12-14 2012-04-27 주식회사 이노링크 Hybrid diversity antenna

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