KR101632151B1 - An antenna apparatus for load-modulated beamspace mimo system - Google Patents

An antenna apparatus for load-modulated beamspace mimo system Download PDF

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Publication number
KR101632151B1
KR101632151B1 KR1020150063914A KR20150063914A KR101632151B1 KR 101632151 B1 KR101632151 B1 KR 101632151B1 KR 1020150063914 A KR1020150063914 A KR 1020150063914A KR 20150063914 A KR20150063914 A KR 20150063914A KR 101632151 B1 KR101632151 B1 KR 101632151B1
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South Korea
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conductive substrate
slots
insulating layer
antennas
resin insulating
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KR1020150063914A
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Korean (ko)
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최일도
이경태
이주용
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한국과학기술원
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A load-modulated beam space MIMO antenna apparatus according to an embodiment of the present invention includes a conductive substrate, a resin insulating layer formed by covering the conductive substrate on one or both surfaces of the conductive substrate, A plurality of through-holes formed through the conductive substrate and the resin insulating layer, and a plurality of through-holes formed on the resin insulating layer, the plurality of through- And a plurality of radiators fed from the RF power source through the plurality of through holes.
A load modulation beam space MIMO antenna apparatus according to the present invention includes a load modulation beam space MIMO system that shares a single RF power and feeds a plurality of antennas and forms a radiation pattern corresponding to a transmission signal through admittance control loaded to each antenna The correlation between radiation patterns of a plurality of antennas is low so that coupling between antennas is minimized so that there is little influence by the surrounding environment and a large number of antennas can be integrated in a narrow space with high stability. It is effective.

Description

[0001] The present invention relates to a load-modulated beam-space MIMO antenna apparatus,

[0001] The present invention relates to a load-modulated beam space multiple input multiple output (MIMO) antenna apparatus, and more particularly, to a load-modulated beam space multiple input multiple output (MIMO) antenna apparatus which feeds a plurality of antennas sharing a single RF power, In a load-modulated beam-space MIMO system that forms a radiation pattern corresponding to a signal, correlation between radiation patterns by a plurality of antennas is low, coupling between antennas is minimized, To a load-modulated beam-space MIMO antenna apparatus capable of integrating a plurality of antennas.

In general, a communication system based on a voice communication service uses a single input single output (SISO) system using only a single antenna element in narrow frequency band characteristics within a limited frequency range. However, a SISO system using a single antenna has a narrow band There was a great deal of difficulty in transmitting large amounts of data at high speed within a channel. Thus, a MIMO (Multiple Input Multiple Output) technique has emerged as a next generation wireless transmission technology that enables the data transmission / reception ratio to be transmitted with a lower error probability by independently driving each antenna using a plurality of antennas.

However, in a multiple input multiple output (MIMO) technique for improving data rate using a general array antenna, when an antenna is extended to improve data rate, an RF chain for feeding RF power also increases, And the power consumption increases. Therefore, the existing MIMO system has a problem that it is difficult to expand in a mobile terminal having a limitation in size and power consumption.

That is, in the conventional MIMO system, since the same number of RF chains are used as the number of antennas increases, the system complexity can be greatly increased, and energy efficiency becomes very low due to the presence of a power amplifier in each RF chain . In order to solve this problem, a beam space MIMO technique using a single RF power has been proposed.

The beam-space MIMO system has the effect of transmitting multiple streams using a single RF chain. In the conventional beam-space MIMO system, however, it has a structure composed of an active antenna element fed by a single RF chain and a parasitic antenna element around it, The radiation pattern is formed by coupling between the active antenna element and the parasitic antenna element, so that the stability is degraded.

Specifically, in a conventional beam-space MIMO system, a Z-matrix, which is a parameter indicating the coupling between antennas, is required for signal processing of the baseband stage. The Z-matrix is defined by the structure of the antenna and the surrounding environment . However, if the Z-matrix is changed and the Z-matrix is not fixed, the value of the Z-matrix is changed every time when a person passes around the antenna or an object around the antenna is changed. The processing becomes practically impossible. That is, the conventional beam-space MIMO system is advantageous in that it increases the number of antennas as compared with the conventional MIMO system, but has a problem that the burden increases in terms of signal processing of the baseband stage.

A load-modulated beam-space MIMO system attempts to solve this problem. Instead of supplying power by mutual coupling between a plurality of antennas, a single RF power is distributed to a plurality of antennas, and power is fed and transmitted through admittance control To form a radiation pattern corresponding to the signal. However, although the load modulation spatial beam MIMO system has a problem of increasing the complexity of the admittance loading circuit for each antenna, it can improve the stability. For this purpose, the antenna of the load modulation beam space MIMO system has a The correlation must be small.

In order to solve the above problems, the present invention is applied to a load modulation beam space MIMO system that feeds a plurality of antennas sharing a single RF power and forms a radiation pattern corresponding to a transmission signal through admittance control loaded to each antenna The present invention relates to an antenna device having a low correlation between radiation patterns by a plurality of antennas and minimizing coupling between antennas so that there is little influence due to the surrounding environment and a load modulation capable of integrating a plurality of antennas in a narrow space, And to provide a beam space MIMO antenna apparatus.

According to an aspect of the present invention, there is provided a load-modulated beam space MIMO antenna apparatus comprising: a conductive substrate; a resin insulating layer covering the conductive substrate on one or both surfaces of the conductive substrate; A plurality of through-holes formed through the conductive substrate and the resin insulating layer, and a plurality of through-holes formed through the conductive substrate and the resin insulating layer, And a plurality of radiators formed on the layer and fed from the single RF power source through the plurality of through holes.

The plurality of slots are "L" -shaped slots. In the plurality of slots, one end of the side corresponding to the longer side in the " L "shape is opened in contact with the edge of the conductive substrate, One end of the side corresponding to the short side of the length is not in contact with the edge of the conductive substrate and is closed.

The plurality of slots are formed at equal distances from the center point of the conductive substrate, and the plurality of slots are formed symmetrically with respect to the center point of the conductive substrate.

Wherein the plurality of radiators are formed of flat plates of the same shape and the plurality of radiators form pairs each one of the plurality of slots and each radiator and a part of the slots in each pair of the plurality of slots Overlap.

According to another aspect of the present invention, there is provided a method of fabricating a load-modulated beam space multiple input multiple output (MIMO) antenna device, comprising: preparing a conductive substrate; Forming a resin insulating layer on one or both surfaces of the conductive substrate so as to cover the conductive substrate, removing a mask formed on one or both surfaces of the conductive substrate, Forming a plurality of exposed slots that are not covered by the layer, forming a plurality of through-holes through the conductive substrate and the resin insulating layer, , Forming a plurality of radiators that are fed from the single RF power source through the plurality of through holes.

The technique disclosed in the present invention can have the following effects. It is to be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, as it is not meant to imply that a particular embodiment should include all of the following effects or only the following effects.

A load modulation beam space MIMO antenna apparatus according to the present invention includes a load modulation beam space MIMO system that shares a single RF power and feeds a plurality of antennas and forms a radiation pattern corresponding to a transmission signal through admittance control loaded to each antenna The correlation between radiation patterns of a plurality of antennas is low so that coupling between antennas is minimized so that there is little influence by the surrounding environment and a large number of antennas can be integrated in a narrow space with high stability. It is effective.

1 shows a conceptual diagram of a load-modulated beam-space MIMO system in comparison with existing conventional MIMO systems and conventional beam-space MIMO systems.
Figure 2 shows a block diagram of a load modulation beam space MIMO system.
3 illustrates a load modulation beam space MIMO antenna apparatus according to an embodiment of the present invention.
4 shows S-parameters of a load-modulated beam-space MIMO antenna apparatus according to an embodiment of the present invention.
FIGS. 5-8 illustrate simulation and measurement results of a radiation pattern formed by a load-modulated beam-space MIMO antenna apparatus according to an embodiment of the present invention.
9 is a graph illustrating a result of calculation of a correlation value of a load modulation beam space MIMO antenna apparatus according to an embodiment of the present invention by simulation.
10 is a flowchart of a method for fabricating a load-modulated beam-space MIMO antenna apparatus according to another embodiment of the present invention.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . 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 in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprise", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, , 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 in the present application .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 shows a conceptual diagram of a load-modulated beam-space MIMO system (see Load-Modulated MIMO in FIG. 1C) and a conventional beam-space MIMO system ) Beam Space MIMO).

That is, in the conventional conventional MIMO system shown in FIG. 1A, independent RF power sources v 1 (t), v 2 (t), ... v T (t) exist, And is fed to the antenna R through a line. Therefore, in a conventional conventional MIMO system using a general array antenna, an RF chain for supplying RF power is also increased to increase the complexity of hardware and power consumption. Therefore, in a mobile terminal having a limitation on product size and power consumption It is difficult to expand. That is, in the conventional conventional MIMO system as shown in FIG. 1 (a), since the same number of RF chains are used as the number of antennas increases, the system complexity can be greatly increased. In each RF chain, There is a problem that the energy efficiency becomes very low.

On the other hand, the existing beam spatial MIMO system current i 2 (t) which is induced by power feeding to connect a single RF power v 1 (t) to one active antenna Z 1 (t) and hence in (b) of Figure 1, ... is fed to the T i (t) parasitic antenna Z 2 (t), by ... Z T (t) is by coupling of such an active antenna and the parasitic antenna to form a radiation pattern. Since the conventional beam-space MIMO system uses a single RF power source, the power and system complexity are somewhat reduced compared to conventional MIMO systems, but the stability is degraded. That is, in the existing beam-space MIMO system as shown in FIG. 1 (b), a Z-matrix, which is a parameter indicating coupling between antennas, is required for signal processing of the baseband stage, Is determined by the structure of the antenna and the surrounding environment. However, since this Z-matrix is changed every time when a person passes around the antenna or an object around the antenna is changed, the Z-matrix is changed and becomes fluid, so that the signal processing of the baseband stage is practically So that there is a problem that the burden is increased in terms of the signal processing of the baseband stage.

A load modulation beam space MIMO system according to an embodiment of the present invention shown in FIG. 1 (c) compared to conventional conventional MIMO systems and beam space MIMO systems shown in FIGS. 1 (a) and 1 (b) The power supply V is shared by the respective antennas R so that the power is fed directly. Instead of supplying power by mutual coupling between a plurality of antennas, a single RF power is distributed to a plurality of antennas, A more stable MIMO system can be realized by forming a radiation pattern corresponding to a transmission signal through admittance control.

Figure 2 shows a block diagram of a load modulation beam space MIMO system. 2, the load modulation beam space MIMO system 100 includes an oscillator 101, a power amplifier (PA) 102, a circulator 103, a matching circuit 104, a load modulator 105, And a plurality of antennas 106. This distributes a single RF power to each antenna, and controls the impedance applied to each antenna so that a radiation pattern corresponding to a transmission signal can be stably formed.

The load-modulated beam-space MIMO system 100 may be configured such that a single RF power 101 is distributed to a plurality of antennas 106 for feeding and admittance control loaded on each antenna, instead of supplying power by mutual coupling between a plurality of antennas Thereby forming a radiation pattern corresponding to the transmission signal. At this time, the load modulator 105 provides a variable admittance value for controlling the current flowing through each of the plurality of antennas 106 according to the transmission signal of the modem. This is because the plurality of antennas 106 (Digital signal processor) based on the current value to be controlled to flow through each of the plurality of antennas 106 and the resistance of each of the plurality of antennas 106, thereby providing a variable admittance value , Whereby it is possible to form a stable radiation pattern.

The load-modulated beam-space MIMO system 100 may increase the complexity of the admittance loading circuit for each antenna, but may improve the stability of the radiation pattern. For this purpose, the antenna of the load- The correlation between the patterns must be designed to be small. The load-modulated beam-space MIMO antenna apparatus according to the present invention is an antenna apparatus for minimizing a correlation between radiation patterns to be used in such a beam-space MIMO system.

3 illustrates a load modulation beam space MIMO antenna apparatus 200 according to an embodiment of the present invention. The MIMO antenna apparatus 200 includes a conductive substrate 203, a conductive substrate 203 covering the conductive substrate 203 on one or both surfaces of the conductive substrate 203, A plurality of "L" shaped slots 201 formed by exposing a part of the conductive substrate 203 without being covered with the resin insulating layer 202, A plurality of through-holes 204 formed through the conductive substrate 203 and the resin insulating layer 202 and a plurality of through holes 204 formed on the resin insulating layer 202, And a plurality of radiators 205 that are fed through the through holes 204 of the radiator 205.

In the load modulation beam space MIMO antenna apparatus 200 according to an embodiment of the present invention, a single RF power source is supplied to each radiator 205 through each through hole 204 to share RF power, and each radiator 205 Form an "L" -shaped slot 201 and a plurality of antenna elements 206.

3, a plurality of "L" shaped slots 201 of the load-modulated beam-space MIMO antenna device 200 form slotted antennas, in which a part of the conductive substrate 203 is connected to the resin insulating layer 202 In particular, one end of the side corresponding to the long side in the "L" -shaped shape is opened in contact with the edge of the conductive substrate 203 and corresponds to the side having the short length in the "L & Has a closed shape because it is not in contact with the edge of the conductive substrate 203.

3, the plurality of "L" -shaped slots 201 are spaced at the same distance from the center point of the conductive substrate 203 and may be formed symmetrically with respect to the center point of the conductive substrate 203 have. The plurality of radiators 205 may be spaced at the same distance from the center point of the conductive substrate 203 as a plurality of "L" shaped slots 201 and may be formed symmetrically with respect to the center point of the conductive substrate 203 have. As described above, the plurality of antenna elements 206 may be formed to have a structure symmetrical with respect to the center point of the conductive substrate 203.

On the other hand, the plurality of radiators 205 may be formed into flat plates of the same shape. The plurality of radiators 205 form a plurality of " L "-shaped slots 201 and one pair, respectively, so that a plurality of antenna elements 206 can be formed. In addition, The radiator 205 and the plurality of " L "shaped slots 201 are formed so that a part of the radiator and the" L "

In the load modulation beam space MIMO antenna apparatus 200 according to an embodiment of the present invention formed as described above, the correlation between radiation patterns by each antenna may be a small value of about 5% And thus can be used in a load-modulated beam-space MIMO system.

FIG. 4 shows an S-parameter of the load modulation beam space MIMO antenna apparatus 200 according to an embodiment of the present invention. It can be seen that the antenna characteristic of the present embodiment designed to have a resonance frequency of 2.5 GHz is implemented.

In this embodiment, the radiation pattern formed by the load modulation beam space MIMO antenna apparatus is calculated by simulation and compared with the radiation pattern of the actually fabricated antenna.

As shown in Fig. 3, four radiation patterns in each antenna direction were formed in consideration of four slot antennas (patterns 1 to 4). As described above, in the load-modulated beam-space MIMO system 100 sharing a single RF power, the impedance modulated by the load modulator 105 is adjusted to form four radiation patterns deviated in each antenna direction First, after simulating the case of forming four radiation patterns, the radiation pattern predicted by the calculation is shown. Then, the actual antenna is fabricated, and the impedance applied to the four slot antenna sides is adjusted, The radiation patterns of the branches were formed and the radiation patterns were measured and verified in comparison with the simulation results. The results are shown in FIGS. 5 to 8. FIG.

FIGS. 5 to 8 show the simulation results for four radiation patterns (Pattern 1 to Pattern 4) shifted in the direction of the respective antennas and the results of measurement of the radiation pattern formed by the actually fabricated antenna. From these results, it can be confirmed that the simulation result and the measurement result are almost the same, and the simulation of the radiation pattern is verified.

Since the correlation between the plurality of antennas must be low as described above, the antenna for use in the load-modulated beam-space MIMO system has a correlation between the radiation patterns of the respective antennas by simulation, The results are shown in Fig.

Referring to FIG. 9, in the antenna apparatus of the present embodiment, two correlation values for four antennas are calculated by simulation, and as a result, it is confirmed that the correlation value 801 is all around 5% Thus, it can be seen that the antenna apparatus of the present embodiment has a small correlation between the antennas and is suitable for use in a load modulation beam space MIMO system.

As described above, the load-modulated beam-space MIMO antenna apparatus according to the present invention shares a single RF power and feeds a plurality of antennas and forms a radiation pattern corresponding to a transmission signal through admittance control loaded to each antenna The present invention relates to an antenna apparatus for use in a load-modulated beam-space MIMO system, in which correlation between radiation patterns by a plurality of antennas is low, coupling between antennas is minimized, There is an effect that the antenna can be integrated.

FIG. 10 is a flowchart illustrating a method for fabricating a load-modulated beam space multiple input multiple output (MIMO) antenna apparatus according to another embodiment of the present invention.

A method for fabricating a load-modulated beam-space MIMO antenna apparatus according to another embodiment of the present invention includes the steps of preparing a conductive substrate (S110), forming a plurality of "L" (S120) forming a mask on the conductive substrate, forming a resin insulating layer on the conductive substrate to cover the conductive substrate on one or both surfaces of the conductive substrate (S130), removing the mask formed on one surface or both surfaces of the conductive substrate (S140) of forming a plurality of exposed "L" shaped slots in which a part of the substrate is not covered by the resin insulating layer (S140), a plurality of through holes forming a plurality of radiators through the plurality of through holes from a single RF power source on the resin insulating layer (S160) The.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (12)

A load-modulated beam space multiple input multiple output (MIMO) antenna apparatus,
A conductive substrate;
A resin insulating layer formed on one surface or both surfaces of the conductive substrate so as to cover the conductive substrate;
A plurality of slots formed by exposing a part of the conductive substrate without being covered with the resin insulating layer;
A plurality of through-holes formed through the conductive substrate and the resin insulating layer; And
And a plurality of radiators formed on the resin insulating layer and fed through the plurality of through holes from a single RF power source. The method according to claim 1,
Said plurality of slots being "L" shaped slots,
In the plurality of slots,
One end of the side corresponding to the longer side in the "L" shape is opened in contact with the edge of the conductive substrate,
And one end of the side corresponding to the shorter side of the "L" -shape is not in contact with the edge of the conductive substrate and is closed. The method according to claim 1,
Wherein the plurality of slots are formed at equal distances from a center point of the conductive substrate. The method according to claim 1,
Wherein the plurality of slots are formed symmetrically with respect to a center point of the conductive substrate. The method according to claim 1,
Wherein the plurality of radiators are formed of flat plates of the same shape. The method according to claim 1,
Wherein the plurality of radiators form a pair with the plurality of slots,
Wherein a plurality of radiators and a portion of the radiator and slot are overlapped in each pair of the plurality of slots. A method for fabricating a load-modulated beam space multiple input multiple output (MIMO) antenna device,
Preparing a conductive substrate;
Forming a mask on one side or both sides of the conductive substrate;
Forming a resin insulating layer on one side or both sides of the conductive substrate to cover the conductive substrate;
Removing a mask formed on one or both sides of the conductive substrate to form a plurality of exposed slots in which a part of the conductive substrate is not covered by the resin insulating layer;
Forming a plurality of through-holes through the conductive substrate and the resin insulating layer; And
And forming a plurality of radiators on the resin-insulating layer from a single RF power source through the plurality of through-holes. ≪ Desc / Clms Page number 19 > 8. The method of claim 7,
Wherein the mask comprises a plurality of "L"
Said plurality of slots being "L" shaped slots,
In the plurality of slots,
One end of the side corresponding to the longer side in the "L" shape is opened in contact with the edge of the conductive substrate,
Wherein one end of the side corresponding to the shorter side of the "L" -shaped shape is closed without being in contact with the edge of the conductive substrate. 8. The method of claim 7,
Wherein the plurality of slots are spaced at equal distances from a center point of the conductive substrate. ≪ Desc / Clms Page number 20 > 8. The method of claim 7,
Wherein the plurality of slots are formed symmetrically with respect to a center point of the conductive substrate. ≪ Desc / Clms Page number 20 > 8. The method of claim 7,
Wherein the plurality of radiators are formed of flat plates of the same shape. ≪ RTI ID = 0.0 > 8. < / RTI > 8. The method of claim 7,
Wherein the plurality of radiators form a pair with the plurality of slots,
Wherein the radiator and a portion of the slot overlap each other in each pair of the plurality of radiators and the plurality of slots.
KR1020150063914A 2015-01-27 2015-05-07 An antenna apparatus for load-modulated beamspace mimo system KR101632151B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101142083B1 (en) * 2011-02-01 2012-05-03 엘에스엠트론 주식회사 Spiral slot antenna
KR101169932B1 (en) * 2010-09-10 2012-07-30 주식회사 이엠따블유 Multi band mimo antenna
KR101401385B1 (en) * 2012-07-03 2014-05-30 한국과학기술원 Integration structure of slot antenna
KR101484749B1 (en) * 2008-08-19 2015-01-21 삼성전자주식회사 An antenna apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101484749B1 (en) * 2008-08-19 2015-01-21 삼성전자주식회사 An antenna apparatus
KR101169932B1 (en) * 2010-09-10 2012-07-30 주식회사 이엠따블유 Multi band mimo antenna
KR101142083B1 (en) * 2011-02-01 2012-05-03 엘에스엠트론 주식회사 Spiral slot antenna
KR101401385B1 (en) * 2012-07-03 2014-05-30 한국과학기술원 Integration structure of slot antenna

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