JP2003124733A - Loop-shaped antenna and communication equipment provided with the same - Google Patents

Loop-shaped antenna and communication equipment provided with the same

Info

Publication number
JP2003124733A
JP2003124733A JP2001315567A JP2001315567A JP2003124733A JP 2003124733 A JP2003124733 A JP 2003124733A JP 2001315567 A JP2001315567 A JP 2001315567A JP 2001315567 A JP2001315567 A JP 2001315567A JP 2003124733 A JP2003124733 A JP 2003124733A
Authority
JP
Japan
Prior art keywords
loop
electrode
short
radiation electrode
antenna
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2001315567A
Other languages
Japanese (ja)
Inventor
Tomonao Yamaki
知尚 山木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
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 Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2001315567A priority Critical patent/JP2003124733A/en
Priority to GB0223457A priority patent/GB2381664B/en
Priority to DE10247543A priority patent/DE10247543B4/en
Priority to US10/269,121 priority patent/US6680708B2/en
Publication of JP2003124733A publication Critical patent/JP2003124733A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles

Abstract

PROBLEM TO BE SOLVED: To miniaturize an antenna. SOLUTION: A radiation electrode 2 for performing antenna operation has a loop-shaped electrode 3 and a short-circuited electrode 4 for shortcutting the loop of the loop-shaped electrode 3. One terminal side 3a of the loop-shaped electrode 3 is a power supply terminal and the other terminal side 3b is an open terminal and a feeding terminal side portion 3α and an open terminal side portion 3β are adjacently located through an interval and coupled through a capacitor. A loop Loop1 of the loop-shaped electrode 3 has an electrical length corresponding to the resonance frequency of the basic mode of setting. A short loop Loop2 from the power supply terminal 3a of the loop-shaped electrode 3 through the short-circuited electrode 4 to the open terminal 3b has the resonance frequency of the higher-order mode of setting. Thus, the radiating electrode 2 performs the antenna operation in the basic mode and the higher- order mode. Namely, only by providing one radiating electrode 2, the signals of frequency bands in the predetermined basic mode and higher-order mode can be transmitted or received.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、ループ形状のアン
テナおよびそれを備えた通信機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop-shaped antenna and a communication device including the same.

【０００２】[0002]

【背景技術】アンテナの一つとして、例えば、複数の放
射電極を有しているものがある。それら各放射電極にそ
れぞれ互いに異なる周波数帯の共振周波数を持たせるこ
とにより、各放射電極は、それぞれ、互いに異なる周波
数帯の信号の送信又は受信を行うことができる。これに
より、複数の放射電極を備えたアンテナは、当該一つの
アンテナで、複数の周波数帯の信号の送信又は受信が可
能となる。BACKGROUND ART One of antennas has, for example, a plurality of radiation electrodes. By giving each of the radiation electrodes a resonance frequency in a different frequency band, each of the radiation electrodes can transmit or receive a signal in a different frequency band. Thereby, the antenna provided with a plurality of radiation electrodes can transmit or receive signals in a plurality of frequency bands with the one antenna.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、そのよ
うなアンテナでは、複数の放射電極を設けるために、ア
ンテナの小型化が難しいという問題がある。However, such an antenna has a problem that it is difficult to downsize the antenna because a plurality of radiation electrodes are provided.

【０００４】この発明は上記課題を解決するために成さ
れたものであり、その目的は、一つの放射電極を設ける
だけで、複数の互いに異なる周波数帯の信号の送信又は
受信ができて、小型化が容易なループ状アンテナおよび
それを用いた通信機に関するものである。The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a single radiation electrode for transmitting or receiving a plurality of signals in different frequency bands, which is small in size. The present invention relates to a loop-shaped antenna that can be easily realized and a communication device using the same.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、この発明は次に示す構成をもって前記課題を解決す
る手段としている。すなわち、第１の発明は、アンテナ
動作を行う線状の放射電極を有し、この放射電極の一端
側は信号供給源からの信号を受ける給電端と成し、他端
側は開放端と成しており、当該放射電極は、給電端側部
分と開放端側部分が間隔を介して隣接配置されて略ルー
プ形状に形成されており、この放射電極には当該放射電
極のループをショートカットする短絡電極が設けられて
いることを特徴としている。In order to achieve the above object, the present invention has the following constitution as means for solving the above problems. That is, the first invention has a linear radiation electrode that operates as an antenna, and one end side of this radiation electrode is a feeding end for receiving a signal from a signal supply source, and the other end side is an open end. The radiation electrode is formed in a substantially loop shape with the feeding end side portion and the open end side portion being arranged adjacent to each other with a gap, and this radiation electrode is short-circuited to short-circuit the loop of the radiation electrode. It is characterized in that electrodes are provided.

【０００６】第２の発明は、第１の発明の構成を備え、
放射電極における給電端から開放端に至るループは予め
定められた基本モードの共振周波数に対応した電気長を
有し、放射電極の給電端から短絡電極を通って開放端に
至るショートループは基本モードの共振周波数よりも高
い設定の高次モードの共振周波数に対応した電気長を有
する構成と成して、放射電極は、基本モードのアンテナ
動作と、高次モードのアンテナ動作とを行うことを特徴
としている。A second invention comprises the structure of the first invention,
The loop from the feeding end to the open end of the radiating electrode has an electrical length corresponding to the resonance frequency of the predetermined fundamental mode, and the short loop from the feeding end of the radiating electrode through the short-circuiting electrode to the open end is the fundamental mode. Is characterized by having an electrical length corresponding to a higher-order mode resonance frequency set higher than the resonance frequency, and the radiation electrode performs a fundamental-mode antenna operation and a higher-order mode antenna operation. I am trying.

【０００７】第３の発明は、第１又は第２の発明の構成
を備え、線状の放射電極に代えて、細幅の板状の放射電
極と成していることを特徴としている。A third aspect of the invention has the structure of the first or second aspect of the invention, and is characterized in that a thin plate-shaped radiation electrode is used instead of the linear radiation electrode.

【０００８】第４の発明は通信機に関し、第１又は第２
又は第３の発明の何れか１つの発明のループ状アンテナ
が設けられていることを特徴としている。A fourth invention relates to a communication device, which is the first or second invention.
Alternatively, the loop-shaped antenna according to any one of the third invention is provided.

【０００９】[0009]

【発明の実施の形態】以下に、この発明に係る実施形態
例を図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

【００１０】図１にはこの実施形態例の通信機において
特徴的なループ状アンテナの一例が模式的な斜視図によ
り示されている。なお、通信機には様々な構成があり、
この実施形態例では、アンテナ以外の通信機の構成は何
れの構成を採用してもよく、ここでは、アンテナ以外の
通信機の構成については、その説明を省略する。FIG. 1 is a schematic perspective view showing an example of a loop antenna characteristic of the communication device of this embodiment. There are various configurations for communication devices,
In this embodiment, any configuration of the communication device other than the antenna may be adopted, and the description of the configuration of the communication device other than the antenna is omitted here.

【００１１】この実施形態例において特徴的なループ状
アンテナ１は金属線から成る放射電極２を有している。
この放射電極２は、ループ状電極３と、短絡電極４とを
有して構成されている。ループ状電極３は一端側部分３
αが他端側部分３βと間隔を介して隣接配置されて略ル
ープ形状と成している。このループ状電極３の一端側３
ａは給電端と成しており、この給電端３ａは例えば通信
機の回路基板に形成されている整合回路６を介して信号
供給源７に接続される。また、ループ状電極３の他端側
３ｂは開放端と成している。The loop antenna 1 characteristic of this embodiment has a radiation electrode 2 made of a metal wire.
The radiation electrode 2 is configured to have a loop electrode 3 and a short circuit electrode 4. The loop electrode 3 is a part 3 on one end side.
α is arranged adjacent to the other end side portion 3β with a space therebetween to form a substantially loop shape. One end side 3 of this loop electrode 3
Reference numeral a denotes a power supply end, and the power supply end 3a is connected to a signal supply source 7 via a matching circuit 6 formed on, for example, a circuit board of a communication device. The other end 3b of the loop electrode 3 is an open end.

【００１２】この実施形態例では、給電端側部分３αと
開放端側部分３βは間隔を介して隣接配置されているの
で、給電端側部分３αと開放端側部分３β間には容量が
発生し、これら給電端側部分３αと開放端側部分３βは
容量を介して結合する。In this embodiment, since the power feeding end side portion 3α and the open end side portion 3β are arranged adjacent to each other with a gap, a capacity is generated between the power feeding end side portion 3α and the open end side portion 3β. , The power feeding end side portion 3α and the open end side portion 3β are coupled via a capacitor.

【００１３】この実施形態例では、ループ状電極３の給
電端３ａから開放端３ｂに至るループ（基本ループ）Ｌ
oop１は、予め定められた基本モードの共振周波数f1を
持つための電気長を有している。In this embodiment, a loop (basic loop) L from the feeding end 3a of the loop electrode 3 to the open end 3b is formed.
oop1 has an electrical length for having a predetermined fundamental mode resonance frequency f1.

【００１４】短絡電極４は、ループ状電極３のループを
ショートカットする形態で配置されるものである。この
短絡電極４によって、ループ状電極３の給電端３ａから
短絡電極４を通って開放端３ｂに至るショートループＬ
oop２が構成される。この実施形態例では、基本モード
の共振周波数f1よりも高い高次モードの共振周波数f2が
予め定められている。ループ状電極３に対する短絡電極
４の配置位置や、短絡電極４の長さは、ショートループ
Ｌoop２が設定の高次モードの共振周波数f2を持つため
の電気長を有することができるように設定されている。
なお、短絡電極４は、ループ状電極３と同一材料により
構成してもよいし、異なる材料により構成してもよい。The short-circuit electrode 4 is arranged so as to short-circuit the loop of the loop electrode 3. With this short-circuit electrode 4, a short loop L from the feeding end 3a of the loop-shaped electrode 3 through the short-circuit electrode 4 to the open end 3b.
oop2 is configured. In this embodiment, the higher-order mode resonance frequency f2, which is higher than the fundamental-mode resonance frequency f1, is predetermined. The arrangement position of the short-circuit electrode 4 with respect to the loop-shaped electrode 3 and the length of the short-circuit electrode 4 are set so that the short-loop Loop2 can have an electric length for having the resonance frequency f2 of the set higher-order mode. There is.
The short-circuit electrode 4 may be made of the same material as the loop-shaped electrode 3 or may be made of a different material.

【００１５】この実施形態例のループ状アンテナ１で
は、例えば、信号供給源７から整合回路６を介してルー
プ状電極３の給電端３ａに基本モードの共振周波数f1を
持つ信号が供給されると、その信号の多くは、給電端３
ａから基本ループＬoop１の経路でもって開放端３ｂに
向けて通電する。これにより、ループ状電極３が基本モ
ードの共振周波数f1で共振して、放射電極２は基本モー
ドのアンテナ動作（つまり、信号の送信又は受信の動
作）を行う。In the loop antenna 1 of this embodiment, for example, when a signal having the fundamental mode resonance frequency f1 is supplied from the signal supply source 7 to the feeding end 3a of the loop electrode 3 via the matching circuit 6. , Most of the signals are at the power feed end 3
Power is supplied from a to the open end 3b through the path of the basic loop Loop1. As a result, the loop electrode 3 resonates at the resonance frequency f1 of the fundamental mode, and the radiation electrode 2 performs the antenna operation of the fundamental mode (that is, the operation of transmitting or receiving a signal).

【００１６】また、信号供給源７からループ状電極３の
給電端３ａに高次モードの共振周波数f2を持つ信号が供
給されると、その信号の多くは、給電端３ａからショー
トループＬoop２の経路でもって開放端３ｂに向けて通
電する。これにより、ループ状電極３や短絡電極４が高
次モードの共振周波数f2で共振して、放射電極２が高次
モードのアンテナ動作を行う。When a signal having a higher-order mode resonance frequency f2 is supplied from the signal supply source 7 to the feeding end 3a of the loop electrode 3, most of the signal is routed from the feeding end 3a to the short loop Loop2. Therefore, electricity is applied toward the open end 3b. As a result, the loop electrode 3 and the short-circuit electrode 4 resonate at the resonance frequency f2 of the higher order mode, and the radiation electrode 2 performs the antenna operation of the higher order mode.

【００１７】ところで、ループ状電極３の給電端側部分
３αと開放端側部分３β間の容量は、高次モードのアン
テナ動作における利得に大きく関与する。このことか
ら、この実施形態例では、ループ状電極３の給電端側部
分３αと開放端側部分３β間の容量は、高次モードの利
得を向上させることができるように適宜に調整されて設
定されている。その容量の調整手法としては、例えば、
ループ状電極３における給電端側部分３αと、開放端側
部分３βとの並列している長さを調整したり、それら並
列している給電端側部分３αと、開放端側部分３βとの
間の間隔を調整することにより、給電端側部分３αと開
放端側部分３β間の容量を調整することができる。By the way, the capacitance between the feeding end side portion 3α and the open end side portion 3β of the loop electrode 3 greatly contributes to the gain in the antenna operation in the higher order mode. From this, in this embodiment, the capacitance between the feeding end side portion 3α and the open end side portion 3β of the loop electrode 3 is appropriately adjusted and set so that the gain of the higher order mode can be improved. Has been done. As a method of adjusting the capacity, for example,
In the loop electrode 3, the length of the feeding end side portion 3α and the open end side portion 3β in parallel is adjusted, or between the feeding end side portion 3α and the open end side portion 3β in parallel. By adjusting the interval of, the capacity between the power feeding end side portion 3α and the open end side portion 3β can be adjusted.

【００１８】なお、この発明はこの実施形態例の形態に
限定されるものではなく、様々な実施の形態を採り得
る。例えば、この実施形態例では、放射電極２のループ
状電極３と短絡電極４は金属線により構成されていた
が、例えば金属線に代えて、図２に示されるように、細
幅の金属板によって放射電極２のループ状電極３と短絡
電極４を構成してもよい。このような細幅の板状の放射
電極２とする場合には、金属板を金型を利用して打ち抜
くことによって放射電極２を容易に製造することができ
る。このため、生産性の向上を図ることができる。The present invention is not limited to the form of this embodiment, and various embodiments can be adopted. For example, in this embodiment, the loop electrode 3 and the short-circuit electrode 4 of the radiation electrode 2 are made of metal wires, but instead of the metal wires, for example, as shown in FIG. The loop-shaped electrode 3 of the radiation electrode 2 and the short-circuit electrode 4 may be configured by. In the case of the plate-shaped radiation electrode 2 having such a narrow width, the radiation electrode 2 can be easily manufactured by punching a metal plate using a die. Therefore, productivity can be improved.

【００１９】また、ループ状電極３と短絡電極４のうち
の一方側を金属線により構成し、他方側を細幅の金属板
により構成してもよい。さらに、例えば、この実施形態
例に示した放射電極２と同様な形態を有する誘電体など
の基体の表面に導電材料を形成してループ状電極３や短
絡電極４を構成してもよい。Alternatively, one of the loop electrode 3 and the short-circuit electrode 4 may be made of a metal wire and the other side may be made of a narrow metal plate. Furthermore, for example, the loop electrode 3 or the short-circuit electrode 4 may be formed by forming a conductive material on the surface of a substrate such as a dielectric having a form similar to that of the radiation electrode 2 shown in this embodiment.

【００２０】さらに、この実施形態例では、放射電極２
の給電端３ａは整合回路６を介して信号供給源７に接続
する例を示したが、例えば、放射電極２側のインピーダ
ンスと、信号供給源７側のインピーダンスとの整合がと
れている場合には、整合回路６を省略してもよい。Further, in this embodiment, the radiation electrode 2
The feeding end 3a of is connected to the signal supply source 7 via the matching circuit 6, but, for example, when the impedance on the radiation electrode 2 side and the impedance on the signal supply source 7 side are matched. The matching circuit 6 may be omitted.

【００２１】さらに、図１や図２の図示では、放射電極
２のループ状電極３は、略四角形状の略ループ形状と成
していたが、ループ状電極３は、略円形状の略ループ形
状でもよいし、三角形状の略ループ形状でもよいし、５
角以上の多角形状の略ループ形状であってもよく、ルー
プ状電極３の形状は特に限定されるものではない。Further, in FIG. 1 and FIG. 2, the loop electrode 3 of the radiation electrode 2 has a substantially square shape and a substantially loop shape, but the loop electrode 3 has a substantially circular shape and a substantially loop shape. It may have a shape, a triangular loop shape, or 5
The shape of the loop electrode 3 is not particularly limited, and it may be a polygonal shape having a corner or more and a polygonal shape.

【００２２】さらに、この実施形態例では、短絡電極４
が１つ設けられるだけであったが、例えば、短絡電極４
を複数設けてもよい。これにより、放射電極２に３つ以
上の周波数帯に対応するアンテナ動作を行わせることが
できることとなる。Furthermore, in this embodiment, the short-circuit electrode 4
Although only one was provided, for example, the short-circuit electrode 4
You may provide two or more. As a result, the radiation electrode 2 can be caused to perform the antenna operation corresponding to three or more frequency bands.

【００２３】[0023]

【発明の効果】この発明によれば、線状又は細幅の板状
の放射電極は給電端側部分と開放端側部分が間隔を介し
て隣接配置されて略ループ形状に形成されており、この
放射電極には当該放射電極のループをショートカットす
る短絡電極が設けられている構成とした。その放射電極
の給電端から開放端に至るループに設定の基本モードの
共振周波数に対応した電気長を持たせ、また、放射電極
の給電端から短絡電極を通って開放端に至るショートル
ープには設定の高次モードの共振周波数に対応する電気
長を持たせることにより、放射電極は、予め定められた
基本モードと高次モードのアンテナ動作を行うことがで
きる。According to the present invention, the linear or narrow plate-shaped radiation electrode is formed in a substantially loop shape by arranging the feeding end side portion and the open end side portion adjacently with a space therebetween. The radiation electrode is provided with a short-circuit electrode that short-circuits the radiation electrode loop. A loop from the feeding end of the radiation electrode to the open end has an electrical length corresponding to the resonance frequency of the set fundamental mode, and a short loop from the feeding end of the radiation electrode to the open end through the short-circuit electrode By giving the electric length corresponding to the resonance frequency of the set higher mode, the radiation electrode can perform the antenna operation in the predetermined fundamental mode and higher mode.

【００２４】つまり、放射電極を一つ設けるだけで、予
め定められた複数の周波数帯の信号の送信又は受信が可
能となるので、複数の放射電極が設けられている構成を
有するアンテナに比べて、アンテナの小型化を図ること
が容易となる。That is, since it is possible to transmit or receive signals in a plurality of predetermined frequency bands by providing only one radiation electrode, as compared with an antenna having a configuration in which a plurality of radiation electrodes are provided. Therefore, it becomes easy to reduce the size of the antenna.

【００２５】また、この発明のループ状アンテナでは、
放射電極の給電端から開放端に至るループ（基本ルー
プ）の電気長によって放射電極の基本モードの共振周波
数が定まる。また、放射電極の給電端から短絡電極を通
って開放端に至るショートループによって放射電極の高
次モードの共振周波数が定まる。ショートループの電気
長は、短絡電極の配置位置や長さを調整することによ
り、基本ループの電気長に影響を与えることなく、可変
設定することができる。つまり、基本ループの電気長
と、ショートループの電気長とは、それぞれ別々に可変
設定することができる。このため、放射電極の基本モー
ドの共振周波数と、高次モードの共振周波数とをそれぞ
れ独立的に設定の周波数に調整設定することができるこ
ととなる。これにより、放射電極の設計が非常に容易と
なり、設計変更などに迅速に対応することができる。Further, in the loop antenna of the present invention,
The resonance frequency of the fundamental mode of the radiation electrode is determined by the electrical length of the loop (fundamental loop) from the feeding end to the open end of the radiation electrode. Further, the resonance frequency of the higher-order mode of the radiation electrode is determined by the short loop from the feeding end of the radiation electrode to the open end through the short-circuit electrode. The electrical length of the short loop can be variably set by adjusting the arrangement position and the length of the shorting electrode without affecting the electrical length of the basic loop. That is, the electrical length of the basic loop and the electrical length of the short loop can be variably set separately. Therefore, the resonance frequency of the fundamental mode and the resonance frequency of the higher-order modes of the radiation electrode can be independently adjusted and set to the set frequencies. As a result, the design of the radiation electrode becomes very easy, and it is possible to quickly respond to design changes and the like.

【００２６】ところで、従来のアンテナでは、放射電極
が持つ複数の共振周波数のうち、最も低い共振周波数以
外の高次の共振周波数を利用して放射電極にアンテナ動
作を行わせようとすると、高次モードのアンテナ動作に
おける利得が非常に悪いために、実質的に、その放射電
極の高次モードのアンテナ動作を利用することは難し
い。By the way, in the conventional antenna, if it is attempted to cause the radiation electrode to perform an antenna operation by utilizing a higher resonance frequency other than the lowest resonance frequency among the plurality of resonance frequencies of the radiation electrode, the higher order resonance frequency is used. It is practically difficult to take advantage of higher order mode antenna operation of the radiating electrode, since the gain in mode antenna operation is so poor.

【００２７】これに対して、この発明では、放射電極の
給電端側部分と開放端側部分が間隔を介して隣接配置し
たので、給電端側部分と開放端側部分は容量を介して結
合された状態となる。この容量結合によって、高次モー
ドにおける利得を向上させることができて、放射電極の
高次モードの共振を信号の送信又は受信に利用すること
を実現できる。On the other hand, according to the present invention, since the power feeding end side portion and the open end side portion of the radiation electrode are arranged adjacent to each other with a gap, the power feeding end side portion and the open end side portion are coupled via the capacitance. It will be in a state of being. By this capacitive coupling, the gain in the higher order mode can be improved, and the resonance of the higher order mode of the radiation electrode can be used for transmitting or receiving a signal.

【００２８】さらに、この発明では、放射電極の給電端
側部分と開放端側部分が容量を介して結合しているの
で、放射電極のループ内に電界を閉じ込めることができ
る。これにより、例えば、グランド側に電界が捉えられ
てしまうことに因る周波数帯域の狭帯域化および利得劣
化を防止することができる。特に、そのような周波数帯
域の狭帯域化および利得劣化は高次モード側において発
生し易いが、放射電極のループ形状による電界の閉じ込
め効果によって、その問題発生を抑制することができ
る。Further, according to the present invention, since the power feeding end side portion and the open end side portion of the radiation electrode are coupled via the capacitance, the electric field can be confined in the loop of the radiation electrode. Thereby, for example, it is possible to prevent the narrowing of the frequency band and the gain deterioration due to the electric field being captured on the ground side. In particular, such narrowing of the frequency band and gain deterioration are likely to occur on the higher-order mode side, but the problem can be suppressed by the effect of confining the electric field due to the loop shape of the radiation electrode.

【００２９】この発明のループ状アンテナを備えた通信
機にあっては、アンテナの小型化により通信機の小型化
を図ることが容易となる。また、通信の信頼性を向上さ
せることができる。In the communication device provided with the loop-shaped antenna of the present invention, the miniaturization of the antenna facilitates the miniaturization of the communication device. In addition, the reliability of communication can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係るループ状アンテナの一実施形態例
を示すモデル図である。FIG. 1 is a model diagram showing an embodiment of a loop antenna according to the present invention.

【図２】ループ状アンテナのその他の実施形態例を示す
モデル図である。FIG. 2 is a model diagram showing another embodiment of the loop antenna.

【符号の説明】[Explanation of symbols]

１ ループ状アンテナ ２ 放射電極 ３ ループ状電極 ４ 短絡電極 ７ 信号供給源 1 loop antenna 2 Radiation electrode 3 loop electrodes 4 short-circuit electrode 7 Signal source

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 アンテナ動作を行う線状の放射電極を有
し、この放射電極の一端側は信号供給源からの信号を受
ける給電端と成し、他端側は開放端と成しており、当該
放射電極は、給電端側部分と開放端側部分が間隔を介し
て隣接配置されて略ループ形状に形成されており、この
放射電極には当該放射電極のループをショートカットす
る短絡電極が設けられていることを特徴としたループ状
アンテナ。1. A linear radiation electrode that operates as an antenna is provided, and one end side of this radiation electrode is a feeding end for receiving a signal from a signal supply source, and the other end side is an open end. The radiation electrode is formed in a substantially loop shape with the feeding end side portion and the open end side portion arranged adjacent to each other with a gap therebetween, and the radiation electrode is provided with a short-circuit electrode that short-circuits the loop of the radiation electrode. A loop-shaped antenna characterized by being used. 【請求項２】 放射電極における給電端から開放端に至
るループは予め定められた基本モードの共振周波数に対
応した電気長を有し、放射電極の給電端から短絡電極を
通って開放端に至るショートループは基本モードの共振
周波数よりも高い設定の高次モードの共振周波数に対応
した電気長を有する構成と成して、放射電極は、基本モ
ードのアンテナ動作と、高次モードのアンテナ動作とを
行うことを特徴とした請求項１記載のループ状アンテ
ナ。2. A loop from the feeding end to the open end of the radiation electrode has an electrical length corresponding to a resonance frequency of a predetermined fundamental mode, and extends from the feeding end of the radiation electrode to the open end through the short-circuit electrode. The short loop is configured to have an electrical length corresponding to a higher-order mode resonance frequency that is set higher than the fundamental-mode resonance frequency, and the radiating electrode has a fundamental-mode antenna operation and a higher-order mode antenna operation. The loop-shaped antenna according to claim 1, wherein 【請求項３】 線状の放射電極に代えて、細幅の板状の
放射電極と成していることを特徴とした請求項１又は請
求項２記載のループ状アンテナ。3. The loop antenna according to claim 1, wherein the linear radiation electrode is replaced by a narrow plate radiation electrode. 【請求項４】 請求項１又は請求項２又は請求項３記載
のループ状アンテナが設けられていることを特徴とした
通信機。4. A communication device comprising the loop antenna according to claim 1, claim 2, or claim 3.
JP2001315567A 2001-10-12 2001-10-12 Loop-shaped antenna and communication equipment provided with the same Pending JP2003124733A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2001315567A JP2003124733A (en) 2001-10-12 2001-10-12 Loop-shaped antenna and communication equipment provided with the same
GB0223457A GB2381664B (en) 2001-10-12 2002-10-09 Loop antenna, surface-mounted antenna and communication equipment having the same
DE10247543A DE10247543B4 (en) 2001-10-12 2002-10-11 loop antenna
US10/269,121 US6680708B2 (en) 2001-10-12 2002-10-12 Loop antenna, surface-mounted antenna and communication equipment having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001315567A JP2003124733A (en) 2001-10-12 2001-10-12 Loop-shaped antenna and communication equipment provided with the same

Publications (1)

Publication Number Publication Date
JP2003124733A true JP2003124733A (en) 2003-04-25

Family

ID=19133713

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001315567A Pending JP2003124733A (en) 2001-10-12 2001-10-12 Loop-shaped antenna and communication equipment provided with the same

Country Status (1)

Country Link
JP (1) JP2003124733A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009284000A (en) * 2008-05-19 2009-12-03 Denso Corp Antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009284000A (en) * 2008-05-19 2009-12-03 Denso Corp Antenna

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