WO2013140758A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
WO2013140758A1
WO2013140758A1 PCT/JP2013/001690 JP2013001690W WO2013140758A1 WO 2013140758 A1 WO2013140758 A1 WO 2013140758A1 JP 2013001690 W JP2013001690 W JP 2013001690W WO 2013140758 A1 WO2013140758 A1 WO 2013140758A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antenna element
switch
communication
communication performance
Prior art date
Application number
PCT/JP2013/001690
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English (en)
Japanese (ja)
Inventor
高英 吉田
Original Assignee
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Publication of WO2013140758A1 publication Critical patent/WO2013140758A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1009—Placing the antenna at a place where the noise level is low and using a noise-free transmission line between the antenna and the receivers

Definitions

  • the present invention relates to an antenna device that can be switched to an optimum antenna form mainly according to a communication environment.
  • an antenna device adopting MIMO (Multiple-Input Multiple-Output) technology that simultaneously transmits and receives a plurality of radio signals (streams) by a space division multiplexing method has appeared.
  • MIMO Multiple-Input Multiple-Output
  • the transmitting side and the receiving side each use a plurality of antenna elements.
  • the transmitting side transmits different data (streams) simultaneously from the respective antennas, and the receiving side combines the received data to speed up communication.
  • SISO communication is an abbreviation for Single-Input Single-Output
  • SIMO is an abbreviation for Single-Input Multiple-Output
  • MISO is an abbreviation for Multiple-Input Single-Output.
  • SISO communication, SIMO communication, and MISO communication are one stream communication methods. In SISO communication, both transmission and reception are performed using one antenna. In SIMO communication, reception is performed using a plurality of antennas, but transmission is performed using one antenna. In MISO communication, conversely, transmission is performed using a plurality of antennas, but reception can be performed using one antenna. That is, in the one-stream communication system, one of the transmission side antenna and the reception side antenna may be a single antenna.
  • the antenna mountable area is very limited. Since the antenna mountable area is small, it is desirable that a plurality of antenna elements can be installed in one place as much as possible.
  • SISO communication SISO communication
  • SIMO communication SIMO communication
  • MISO communication other than MIMO communication there is a case where only one antenna is used, but even in such a case, sufficient radiation efficiency is sufficient to perform good communication. Is required.
  • Patent Document 1 describes a technique for reducing electromagnetic coupling between two antenna elements.
  • a connection circuit is provided between the antenna elements so that the mutual coupling impedance between two adjacent antenna elements is canceled.
  • this technology it is said that a low-coupling and high-efficiency MIMO communication antenna that operates at the same frequency can be realized.
  • Patent Document 1 when communication is performed using only one of the two antennas, radiation efficiency may be deteriorated as compared with a single antenna element. Further, in the technique of Patent Document 1, since two antenna elements are close to each other, there is a problem that directivity occurs in the opposite direction to each antenna element, and a direction with a low gain occurs. This problem causes deterioration of transmission / reception characteristics when the direction of arrival of radio waves changes as in wireless communication using a portable terminal.
  • the present invention switches between a state of functioning as a plurality of antennas (multiple antenna configuration) and a state of functioning as a single antenna (single antenna configuration) according to the communication environment, and provides optimal wireless communication quality
  • An object of the present invention is to provide an antenna device that can be used.
  • the antenna device electrically opens and closes a linear first antenna element, a linear second antenna element, one end of the first antenna element, and one end of the second antenna element.
  • a second open / close switch Connected to one end of the second antenna, a second open / close switch that electrically opens and closes the other end of the first antenna element and the other end of the second antenna element.
  • a selection switch for selecting whether one end of the second antenna is connected to the ground or to a power feeding unit that supplies a signal to one end of the second antenna.
  • the antenna switching method of the present invention electrically opens and closes the other end of the first antenna element and the other end of the second antenna element, It is selected whether one end of the second antenna is connected to the ground or to a power supply unit that supplies a signal to one end of the second antenna.
  • the present invention has the following effects.
  • FIG. 12 is a diagram illustrating the configuration of the antenna device according to the first embodiment.
  • the antenna device 1200 of this embodiment includes an antenna circuit unit 1201, an RF circuit unit 1202, a 1 switch control unit 203, and a communication performance evaluation unit 1204.
  • the RF circuit unit 1202 is responsible for exchanging signals between the antenna and the transmitting / receiving unit (not shown) when transmitting / receiving signals. That is, the RF circuit unit 1202 converts the baseband signal from the transmission / reception unit into a high-frequency signal and outputs it to the antenna circuit unit 1201 as a transmission signal. In addition, the RF circuit unit 1202 demodulates the high frequency signal from the antenna circuit unit 1201 and outputs it as a reception signal to the transmission / reception unit. Further, the RF circuit unit 1202 outputs a received signal to be evaluated to the communication performance evaluation unit 1204.
  • the switch control unit 1203 controls the switching operation of the switches of the antenna circuit a131, the antenna circuit b132, and the antenna circuit d134 of the antenna circuit 1201 shown in FIG. 2 based on the instruction of the communication performance evaluation unit 1204.
  • the communication performance evaluation unit 1204 evaluates the communication performance of the antenna device based on the received signal to be evaluated input from the RF circuit unit 1202. Examples of the communication performance index in the communication performance evaluation unit 1204 include channel capacity, throughput, bit error rate, and block error rate. Details of the operation of the communication performance evaluation unit 1204 will be described later.
  • FIG. 1 is a diagram showing a configuration of the antenna circuit unit 1201 of the present embodiment.
  • the antenna circuit unit 1201 has a ground plate 101.
  • An antenna element a121, antenna element b122, antenna circuit a131, antenna circuit b132, antenna circuit c133, antenna circuit d134, and power feeding part a104 of the antenna device are connected to the ground plate 101.
  • Conductors are used as materials for the ground plate 101, the antenna element a121, and the antenna element b122.
  • the antenna element a121 and the antenna element b122 are basically installed adjacent to each other.
  • the shapes of the antenna element a121 and the antenna element b122 may be deformed by bending as necessary.
  • the antenna element a121 and the antenna element b122 are installed in parallel to each other so that the mounting area is minimized.
  • the antenna element a121 and the antenna element b122 are bent in an L shape so as to be close to the ground plate in order to minimize the mounting area.
  • the antenna element a121 and the antenna element b122 can function as two types of forms. One is a state (non-coupled monopole antenna configuration) in which each functions as two independent monopole antennas. The other is a state where the antenna element a121 and the antenna element b122 are electrically connected to function as a single folded monopole antenna (a folded monopole antenna configuration). These two types of modes can be switched by switches constituting the antenna circuit a131, the antenna circuit b132, and the antenna circuit d134.
  • FIG. 2 shows details of each of the antenna circuit a131, the antenna circuit b132, the antenna circuit c133, and the antenna circuit d134 that are represented by squares in FIG.
  • the antenna circuit a131 has a coil and a switch circuit.
  • the switch of the antenna circuit a131 is turned on.
  • the coil of the antenna circuit a131 has a function of canceling the coupling of the two monopole antennas (non-coupling).
  • the antenna circuit a131 is installed between the antenna element a121 and the antenna element b122 as shown in FIG.
  • the antenna circuit a131 is installed particularly near the ground plate 101 with the antenna circuit c133, the antenna circuit d134, and the power feeding part a104 interposed therebetween.
  • the antenna circuit b132 has a single switch circuit, and is installed between the antenna elements a121 and b122. When the switch of the antenna circuit b132 is turned on, the two antenna elements a121 and b122 are electrically connected to function as one folded monopole antenna. That is, the antenna element a121 and the antenna element b122 change from the form as two uncoupled monopole antennas to the form of one folded monopole antenna.
  • the antenna circuit c133 has a capacitor.
  • the capacitor of the antenna circuit c133 functions as a matching circuit for the antenna element a121 in the form of a non-coupled monopole antenna.
  • the capacitor of the antenna circuit c133 functions to adjust the resonance frequency of the uncoupled monopole antenna.
  • the antenna circuit d134 includes a switch circuit that switches the connection destination of the antenna element b122 between the ground plate 101 and the power feeding unit b201. In the case of the folded monopole antenna configuration, the switch is switched to the ground side, and in the case of the uncoupled monopole antenna configuration, the switch is switched to the power feeding unit b201 side.
  • power is supplied from the power feeding unit a104 to the antenna element a121, and power is supplied from the power feeding unit b201 to the antenna element b122.
  • the switch of the antenna circuit a131 when the switch of the antenna circuit a131 is turned on (connected), the antenna circuit b132 is turned off (opened), and the antenna element a121 is connected to the power feeding part a201 by the antenna circuit d134, the antenna element a121 and the antenna element b122 are connected.
  • the antenna circuit a131 is OFF, the antenna circuit b132 is ON, and the antenna element a121 is connected to the ground plate 101 by the antenna circuit d134, the antenna element a121 and the antenna element b122 are folded monopole.
  • either the folded monopole antenna form or the uncoupled monopole antenna form can be selected by switching each switch.
  • the two antenna elements a121 and b122 are arranged in parallel to each other, and are close to each other in order to save the area. 01 times).
  • the positional relationship between the two antennas is not limited to being parallel unless there are restrictions on the antenna mounting location, mounting area, antenna characteristics, and the like, and the two antennas are installed apart from each other. Also good.
  • two antennas may be installed almost straight.
  • the antenna when the two antenna elements are electrically connected functions as a single monopole antenna that is not folded.
  • FIG. 5 is a diagram showing the result of electromagnetic field simulation showing the current distribution of the antenna device at the antenna resonance frequency in the folded monopole antenna configuration.
  • the lightness and darkness in the figure indicate the current density. The brighter the current density is. It can be seen that the current is distributed throughout the antenna (antenna element a121 and antenna element b122) and the substrate. In this way, it can be expected that the radiation efficiency of the antenna is increased by distributing the current relatively uniformly over a wide area.
  • FIG. 6 shows the current distribution at the antenna resonance frequency of the antenna device when the antenna element b122 is not used and only the antenna element a121 is fed from the feeding section a104 in the uncoupled monopole antenna configuration. Is shown.
  • the uncoupled monopole antenna can exhibit a high radiation efficiency as compared with the case where the coupling between the antennas is strong.
  • the antenna correlation coefficient is reduced, which leads to an improvement in communication performance of MIMO communication that is a space division multiplexing method.
  • the current distribution shown in FIG. 5 is brighter than the case shown in FIG. 6 (non-coupled monopole antenna configuration), so the current density is high. I understand that. Therefore, it can be expected that the radiation efficiency of the antenna alone is higher in the case of the folded monopole antenna than in the case of the uncoupled monopole antenna.
  • FIG. 7 shows the antenna directivity in the folded monopole antenna configuration. Since electromagnetic waves are radiated using the vertical direction of the substrate, it can be seen that directivity close to that of a dipole antenna is exhibited, such as non-directional vertical polarization and 8-shaped horizontal polarization.
  • 8 (a) and 8 (b) show the directivity of the antenna element a121 and the antenna element b122 in the form of an uncoupled monopole antenna, respectively.
  • adjacent antennas having a symmetric structure are isolated by using a non-coupling circuit, directivity characteristics that radiate in opposite directions to each antenna are generated. As a result, there may arise a problem that it is difficult to receive radio waves coming from a certain direction.
  • the two antennas have an asymmetric structure, non-directional radiation characteristics appear in the antenna element a121 in the horizontal direction.
  • FIG. 9 shows the antenna radiation efficiency in the folded monopole antenna configuration and the uncoupled monopole antenna configuration. From this figure, it can be seen that the folded monopole antenna exhibits the highest radiation efficiency at the resonance frequency.
  • FIG. 10 shows the correlation coefficient between antennas of an uncoupled monopole antenna. It can be seen that the correlation coefficient becomes substantially zero at the resonance frequency due to the effect of the antenna circuit a131.
  • MIMO communication that is a space division multiplexing scheme
  • a correlation coefficient between antennas is required to be low so that transmission signals of a plurality of streams can be distinguished on the receiving side.
  • the correlation coefficient here has a sufficiently low value. Show. (Description of operation) Next, the operation of the first embodiment will be described.
  • FIG. 3 shows details of the configuration of the antenna apparatus according to the present embodiment shown in FIG. 1, particularly, the detailed configuration in the antenna circuit unit 1201.
  • Two types of antenna forms are selected by switching by the switch circuits a to d. Selection of the antenna form is performed based on the evaluation result in the communication performance evaluation unit 1204 for the received signal input from the RF circuit unit 1202.
  • the communication performance evaluation unit 1204 evaluates the communication performance according to the flowchart shown in FIG.
  • the switch control unit 1203 controls the switches of the antenna circuit a131, the antenna circuit b132, and the antenna circuit d134 in the antenna circuit 1201.
  • FIG. 4 is a flowchart for explaining an antenna form selection operation in the communication performance evaluation unit 1204 of the antenna apparatus of the first embodiment.
  • communication performance evaluation in the folded monopole antenna form is performed (S1).
  • MSO communication and SISO communication which are one stream communication methods, are mainly used.
  • the communication performance evaluation the received signal input from the RF circuit 1202 is evaluated based on a predetermined index.
  • Examples of communication performance evaluation indexes include throughput, channel capacity, bit error rate, and block error rate.
  • channel capacity is used as an index.
  • the channel capacity is obtained by equation (1).
  • SNR Signal to Noise Ratio, that is, the ratio of received signal to noise power
  • I represents a 2 ⁇ 2 unit matrix
  • H represents a channel matrix and is a 2 ⁇ 2 matrix.
  • the superscript H of H indicates Hermite transposition, that is, complex conjugate transposition. If the transmission signal is S, the reception signal R is H, and the noise component is ignored, it is expressed by the equation (2).
  • r 1 and r 2 are signals received by the first and second antenna elements on the receiving side, respectively, and s 1 and s 2 are signals transmitted from the first and second antenna elements on the transmitting side, respectively. is there.
  • each element h ij of the channel matrix H is a propagation coefficient between the j-th antenna element of the transmitter and the i-th antenna element of the receiver, that is, the phase of a signal transmitted and received between these antenna elements. Represents the amount of rotation and the amount of amplitude attenuation.
  • the propagation coefficient is estimated as follows, for example. That is, a predetermined pilot signal is stored in advance in the receiver, and the transmitter transmits this known pilot signal to the receiver.
  • the propagation coefficient can be estimated by comparing the amplitude and phase of a pilot signal stored in advance and a received signal (that is, a transmitted pilot signal).
  • a channel matrix H is obtained from this propagation coefficient.
  • the propagation coefficient is estimated based on the received signal from the RF circuit 1202 in the communication performance evaluation unit 1204. Furthermore, in this embodiment, the SNR is also estimated based on the received signal from the RF circuit 1202 in the communication performance evaluation unit 1204.
  • SISO communication and MISO communication are mainly used.
  • the transmission capacity in this state is calculated, and the result is held in the communication performance evaluation unit 1204.
  • the communication capacity of SISO communication is expressed by equation (3).
  • h is a propagation coefficient (superscript * means a complex conjugate) in the SISO communication transmission line.
  • the switch controller 1203 switches the antenna circuit a131, the antenna circuit b132, and the antenna circuit d134 in the antenna circuit 1201, and changes the antenna form to two uncoupled monopole antenna forms (S2). In this case, if the number of antennas for transmission and reception is two or more, MIMO communication is possible.
  • the communication capacity is calculated and held using Equation (1) based on the measured H and the separately measured SNR.
  • the operation is as follows. First, it is determined whether or not to use diversity reception by two receiving antennas (S5). Whether or not to use diversity reception is set in the communication performance evaluation unit 1204 in advance. When diversity reception using two uncoupled monopole antenna arrays is used (that is, YES in S5), the communication performance in the reception diversity system is evaluated (S6). In this case, there is one transmission antenna and two reception antennas. The communication capacity in this state is calculated and held.
  • the communication capacity when the antenna element a121 alone is used as one uncoupled monopole antenna configuration is calculated and held (S7).
  • the communication capacity when the antenna element b122 constituting the other of the two uncoupled monopole antennas is used is calculated and held (S8).
  • the antenna configuration that provides the maximum value among the communication capacities retained in S1, S4, and S6 to S8 is the antenna configuration that provides the highest quality communication performance.
  • the communication performance evaluation unit 1204 instructs the switch control unit 1203 to switch the antenna configuration so as to select the antenna configuration determined to be the best, and further, the communication method (MIMO, SISO communication method, etc.) is transmitted to the RF circuit unit 1202. ) To complete the process (S9).
  • FIG. 11 shows an example in which the effect of this embodiment is verified.
  • the base station antenna is assumed to be a non-correlated omnidirectional antenna for simplicity.
  • the channel capacity of the folded monopole antenna that performs SISO communication is 0. 0 than that of the uncoupled monopole antenna. It can be seen that it increases by 2 bps / Hz. This is because the average radiation efficiency of the uncoupled monopole antenna is as low as -2.6 dB, whereas the folded monopole antenna has a relatively high radiation efficiency of -0.4 dB. Is. That is, in the low reception SNR environment, the folded monopole antenna configuration is superior.
  • MIMO communication which is a space division multiplexing system.
  • the SNR is relatively high, such as 10 dB
  • the channel capacity during MIMO communication with a non-coupled monopole antenna is 5.1 bps / Hz
  • SISO communication with a folded monopole antenna 4.1 bps / Hz. It can be seen that it is as low as 1.0 bps / Hz.
  • MIMO communication is said to exhibit higher communication performance than SISO communication.
  • MIMO communication is more susceptible to changes in the surrounding environment, that is, the radio wave propagation environment. For example, when a person holds the antenna device, the correlation coefficient between the antennas, the power balance, and the reception SNR may be deteriorated, and the communication performance may be deteriorated as compared with SISO communication.
  • the antenna configuration showing the highest quality communication characteristics can be selected according to the communication environment, and therefore the antenna device according to the present embodiment can improve such a problem.
  • the antenna device may be installed not only at one place on the ground plate but also at a plurality of places if not close to each other. Accordingly, it is possible to operate three or more antenna elements to perform MIMO communication corresponding to three or more streams. (Explanation of effect) As described above, the present embodiment has the following effects.
  • FIG. 13 shows the configuration of the antenna device of the second embodiment.
  • the antenna device 1300 of the second embodiment includes a linear first antenna element 1301, a linear second antenna element 1302, one end of the first antenna element, and one end of the second antenna element. And a first opening / closing switch 1303 that electrically opens and closes. Further, the antenna device 1300 is connected to a second opening / closing switch 1304 that electrically opens and closes the other end of the first antenna element and the other end of the second antenna element, and one end of the second antenna.
  • a selection switch 1305. (Description of operation) In the antenna device 1300 of the second embodiment, the selection switch 1305 connects one end of the second antenna to the ground or a power supply unit that supplies a signal to one end of the second antenna. Or select. (Explanation of effect) In the present embodiment, the following effects can be obtained.
  • the present invention mainly relates to an antenna device that can be switched to an optimum antenna form according to the communication environment, and has industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)

Abstract

Le but de la présente invention est de fournir un dispositif d'antenne dans lequel il est possible pour passer d'un format multi-antennes à un format à antenne unique selon l'environnement de communication, et fournir une qualité de communication sans fil optimale. Ce dispositif d'antenne comporte : un premier élément d'antenne linéaire ; un second élément d'antenne linéaire ; un premier commutateur d'ouverture/fermeture pour l'ouverture/fermeture de la connexion électrique entre une extrémité du premier élément d'antenne et une extrémité du deuxième élément d'antenne ; un deuxième commutateur d'ouverture/fermeture pour l'ouverture/fermeture de la connexion électrique entre l'autre extrémité du premier élément d'antenne et l'autre extrémité du deuxième élément d'antenne ; et un commutateur de sélection connecté à une extrémité de la seconde antenne. Le commutateur de sélection choisit s'il convient de connecter l'extrémité de la seconde antenne à la terre ou à une unité d'alimentation électrique pour fournir un signal à l'extrémité de la seconde antenne.
PCT/JP2013/001690 2012-03-21 2013-03-14 Dispositif d'antenne WO2013140758A1 (fr)

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JP2012063995 2012-03-21
JP2012-063995 2012-03-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI653845B (zh) 2015-08-31 2019-03-11 鴻海精密工業股份有限公司 電子裝置及其天線及用該電子裝置接收或發射信號的方法
WO2020012885A1 (fr) * 2018-07-09 2020-01-16 株式会社村田製作所 Dispositif d'antenne et appareil électronique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123419A1 (fr) * 2005-05-20 2006-11-23 Matsushita Electric Industrial Co., Ltd. Dispositif d'antenne et dispositif terminal de communication mobile
JP2008042852A (ja) * 2006-08-10 2008-02-21 National Institute Of Information & Communication Technology アンテナ
JP2009521898A (ja) * 2007-04-20 2009-06-04 スカイクロス，アイエヌシー． マルチモードアンテナ構造物

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123419A1 (fr) * 2005-05-20 2006-11-23 Matsushita Electric Industrial Co., Ltd. Dispositif d'antenne et dispositif terminal de communication mobile
JP2008042852A (ja) * 2006-08-10 2008-02-21 National Institute Of Information & Communication Technology アンテナ
JP2009521898A (ja) * 2007-04-20 2009-06-04 スカイクロス，アイエヌシー． マルチモードアンテナ構造物

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI653845B (zh) 2015-08-31 2019-03-11 鴻海精密工業股份有限公司 電子裝置及其天線及用該電子裝置接收或發射信號的方法
WO2020012885A1 (fr) * 2018-07-09 2020-01-16 株式会社村田製作所 Dispositif d'antenne et appareil électronique
JPWO2020012885A1 (ja) * 2018-07-09 2020-12-17 株式会社村田製作所 アンテナ装置及び電子機器

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