JPH11136025A - Frequency switching type surface mounting antenna, antenna device using the antenna and communication unit using the antenna device - Google Patents
Frequency switching type surface mounting antenna, antenna device using the antenna and communication unit using the antenna deviceInfo
- Publication number
- JPH11136025A JPH11136025A JP10204902A JP20490298A JPH11136025A JP H11136025 A JPH11136025 A JP H11136025A JP 10204902 A JP10204902 A JP 10204902A JP 20490298 A JP20490298 A JP 20490298A JP H11136025 A JPH11136025 A JP H11136025A
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- antenna
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- 238000004891 communication Methods 0.000 title claims description 14
- 230000005855 radiation Effects 0.000 claims abstract description 51
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000003989 dielectric material Substances 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信機器な
どに用いられる周波数切換型表面実装型アンテナおよび
それを用いたアンテナ装置およびそれを用いた通信機に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency switching type surface mount antenna used for mobile communication equipment and the like, an antenna device using the same, and a communication device using the same.
【０００２】[0002]
【従来の技術】図８に、従来の表面実装型アンテナおよ
びそれを用いたアンテナ装置を示す。図８に示す表面実
装型アンテナは、その基本構成が特開平９−９８０１５
号公報に開示されている。図８において、表面実装型ア
ンテナ６０は、誘電体からなり、一方主面と他方主面と
４つの端面を有する板状の基体６１と、基体６１の一方
主面のほぼ全面に形成されたグランド電極６２と、基体
６１の主として他方主面に形成され、一端が他方主面上
で開放端を形成し、他端が他方主面から１つの端面を介
して一方主面に回り込んでグランド電極６２に接続され
たストリップ状の放射電極６３と、放射電極６３の開放
端にギャップ６４を介して近接して、基体６１の他方主
面から１つの端面を介して一方主面にかけて形成された
給電電極６５からなる。そして、給電電極６５は信号源
６６に接続されて、全体としてアンテナ装置６７を形成
している。2. Description of the Related Art FIG. 8 shows a conventional surface mount antenna and an antenna device using the same. The basic configuration of the surface mount antenna shown in FIG.
No. 6,086,045. 8, a surface-mounted antenna 60 is made of a dielectric material, and has a plate-shaped base 61 having one main surface, the other main surface, and four end surfaces, and a ground formed on substantially the entire one main surface of the base 61. The electrode 62 and the base 61 are formed mainly on the other main surface, one end forms an open end on the other main surface, and the other end goes around the one main surface from the other main surface via one end surface to form a ground electrode. A strip-shaped radiation electrode 63 connected to 62 and a power supply formed from the other main surface of the base 61 to one main surface through one end surface in proximity to the open end of the radiation electrode 63 via the gap 64. It consists of an electrode 65. The power supply electrode 65 is connected to a signal source 66 to form an antenna device 67 as a whole.
【０００３】このように構成された表面実装型アンテナ
６０を含むアンテナ装置６７において、信号源６６から
給電電極６５に入力された信号は、ギャップ６４の部分
に給電電極６５と放射電極６３の開放端との間で形成さ
れる静電容量を介して放射電極６３に入力される。放射
電極６３は、一端が短絡、他端が開放の長さがλ／４の
マイクロストリップ線路共振器として共振する。そし
て、その共振の電力の一部が空間に放射されることによ
ってアンテナとして機能する。[0003] In the antenna device 67 including the surface-mounted antenna 60 configured as described above, the signal input from the signal source 66 to the feeding electrode 65 is applied to the gap 64 at the open ends of the feeding electrode 65 and the radiation electrode 63. Is input to the radiation electrode 63 via the capacitance formed between the two. The radiation electrode 63 resonates as a microstrip line resonator having one end short-circuited and the other end open at λ / 4. Then, a part of the resonance power is radiated into the space to function as an antenna.
【０００４】[0004]
【発明が解決しようとする課題】上記の表面実装型アン
テナは誘電体の基体の表面に形成されたマイクロストリ
ップ線路を共振素子として利用している。そのため、基
体の誘電率を高くして波長短縮率を大きくすることによ
って表面実装型アンテナの小形化を図ることができる。The above surface mount antenna uses a microstrip line formed on the surface of a dielectric substrate as a resonance element. Therefore, the surface mount antenna can be miniaturized by increasing the dielectric constant of the base and increasing the wavelength reduction rate.
【０００５】しかしながら、上記の表面実装型アンテナ
の場合、基体の誘電率を大きくすると表面実装型アンテ
ナの周波数帯域が狭くなるという問題がある。そのた
め、例えばＧＳＭ方式の携帯電話の場合、送信側の周波
数帯域（８９０〜９１５ＭＨｚ）と受信側の周波数帯域
（９３５〜９６０ＭＨｚ）の２つの周波数帯域に対応す
るようなアンテナが必要になるが、１つの表面実装型ア
ンテナではその周波数帯域が狭いために対応できず、２
つの表面実装型アンテナを組み合わせるなどの対策が必
要になる。そのため、表面実装型アンテナが２つに増え
ることに加えて、２つの表面実装型アンテナを接続する
ための外部回路が必要になるなど、コストアップの原因
となっていた。However, in the case of the above surface mount antenna, there is a problem that the frequency band of the surface mount antenna is narrowed when the dielectric constant of the base is increased. Therefore, for example, in the case of a mobile phone of the GSM system, an antenna corresponding to two frequency bands of a transmitting side frequency band (890 to 915 MHz) and a receiving side frequency band (935 to 960 MHz) is required. Two surface-mount antennas cannot cope because of their narrow frequency band.
It is necessary to take measures such as combining two surface mount antennas. For this reason, in addition to the increase in the number of the surface mount antennas to two, an external circuit for connecting the two surface mount antennas is required, which causes an increase in cost.
【０００６】そこで、本発明は、簡単に共振周波数を変
えて複数の周波数に対応することのできる周波数切換型
表面実装型アンテナおよびそれを用いたアンテナ装置お
よびそれを用いた通信機を提供することを目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a frequency switching type surface mount antenna capable of easily changing a resonance frequency to cope with a plurality of frequencies, an antenna device using the same, and a communication device using the same. With the goal.
【０００７】[0007]
【課題を解決するための手段】上記問題点を解決するた
めに、本発明の周波数切換型表面実装型アンテナは、誘
電体または磁性体よりなり、一方主面と他方主面と４つ
の端面を有する直方体状の基体と、前記基体の一方主面
のほぼ全面に形成されたグランド電極と、前記基体の少
なくとも他方主面に形成され、一端が前記基体の他方主
面あるいはいずれかの端面で開放端を形成し、他端が前
記基体のいずれかの端面を介して前記グランド電極と接
続されたストリップ状の放射電極と、前記放射電極の開
放端に第１のギャップを介して近接して形成した給電電
極と、前記放射電極の開放端またはその近傍において、
前記放射電極とそれぞれ第２のギャップを介して近接し
て形成した１つ以上の制御電極を有することを特徴とす
る。In order to solve the above problems, a frequency switching type surface mount antenna according to the present invention is made of a dielectric or magnetic material, and has one main surface, the other main surface, and four end surfaces. A rectangular parallelepiped base, a ground electrode formed on substantially the entirety of one main surface of the base, and a ground electrode formed on at least the other main surface of the base, with one end open at the other main surface or any end surface of the base. An end is formed, and the other end is formed in the form of a strip-shaped radiating electrode connected to the ground electrode through one of the end surfaces of the base, and is formed close to an open end of the radiating electrode through a first gap. Power supply electrode, and at or near the open end of the radiation electrode,
It has one or more control electrodes formed in close proximity to the radiation electrodes via a second gap, respectively.
【０００８】また、本発明の周波数切換型表面実装型ア
ンテナは、誘電体または磁性体よりなり、一方主面と他
方主面と４つの端面を有する直方体状の基体と、前記基
体の少なくともいずれか１つの面に形成されたグランド
電極と、前記基体の１つ以上の面に渡って形成され、一
端が前記基体のいずれかの面で開放端を形成し、他端が
前記グランド電極と接続されたストリップ状の放射電極
と、前記放射電極の開放端に対応して、前記基体のいず
れかの面に形成した給電電極と、前記放射電極の開放端
またはその近傍において、前記放射電極とそれぞれギャ
ップを介して近接して形成した１つ以上の制御電極を有
することを特徴とする。A frequency-switching surface-mount antenna according to the present invention is made of a dielectric material or a magnetic material, and has a rectangular parallelepiped base having one main surface, the other main surface, and four end surfaces, and at least one of the bases. A ground electrode formed on one surface, formed over one or more surfaces of the base, one end forming an open end on any surface of the base, and the other end connected to the ground electrode. A strip-shaped radiating electrode, a feeding electrode formed on any surface of the base corresponding to the open end of the radiating electrode, and a gap between the radiating electrode and the open end of the radiating electrode or in the vicinity thereof. And one or more control electrodes formed in close proximity to each other.
【０００９】また、本発明のアンテナ装置は、上記の周
波数切換型表面実装型アンテナと、一端が前記周波数切
換型表面実装型アンテナの前記制御電極に接続され、他
端が前記グランド電極に接続され、前記制御電極と前記
グランド電極との接続を制御するスイッチを有すること
を特徴とする。Further, the antenna device of the present invention has the above-mentioned frequency-switching surface-mount antenna, and one end connected to the control electrode of the frequency-switching surface-mount antenna and the other end connected to the ground electrode. And a switch for controlling connection between the control electrode and the ground electrode.
【００１０】また、本発明の通信機は、上記のアンテナ
装置を用いたことを特徴とする。[0010] A communication device according to the present invention is characterized by using the above antenna device.
【００１１】このように、構成することにより、本発明
の周波数切換型表面実装型アンテナおよびアンテナ装置
および通信機によれば、１つのアンテナで共振周波数を
切り換えて複数の周波数に対応することができる。According to the above configuration, according to the frequency switching type surface mount antenna, the antenna device, and the communication device of the present invention, the resonance frequency can be switched by one antenna to handle a plurality of frequencies. .
【００１２】[0012]
【発明の実施の形態】図１に、本発明の周波数切換型表
面実装型アンテナおよびそれを用いたアンテナ装置の一
実施例を示す。図１において、周波数切換型表面実装型
アンテナ１は、誘電体からなり、一方主面と他方主面と
４つの端面を有する直方体状の基体２と、基体２の一方
主面のほぼ全面に形成されたグランド電極３と、基体２
の主として他方主面に形成され、一端が他方主面上およ
び部分的に１つの端面に回り込んで開放端を形成し、他
端が１つの端面を介して一方主面に回り込んでグランド
電極３に接続されたストリップ状の放射電極４と、放射
電極４の開放端に第１のギャップ５を介して近接して、
基体２の他方主面から１つの端面を介して一方主面にか
けて形成された給電電極６と、放射電極４の部分的に１
つの端面に回り込んで形成された開放端に第２のギャッ
プ７を介して近接して、基体２の１つの端面から一方主
面にかけて形成された制御電極８からなる。そして、制
御電極８はスイッチ９を介して接地され、また、給電電
極６は信号源１０に接続されて、全体としてアンテナ装
置１１を形成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a frequency switching type surface mount antenna of the present invention and an antenna device using the same. In FIG. 1, a frequency switching type surface mount antenna 1 is made of a dielectric material, and is formed on a substantially rectangular parallelepiped base 2 having one main surface, the other main surface, and four end surfaces, and substantially the entire one main surface of the base 2. Ground electrode 3 and base 2
Is formed on the other main surface, one end of the ground electrode partially and wraps around the other main surface to form an open end, and the other end wraps around the one main surface via the one end surface to form a ground electrode. 3, a strip-shaped radiation electrode 4 connected to 3 and an open end of the radiation electrode 4 close to the open end of the radiation electrode 4 via a first gap 5.
The feed electrode 6 formed from the other main surface of the base 2 to the one main surface via one end surface, and one part of the radiation electrode 4
A control electrode 8 is formed from one end face to one main face of the base 2 in close proximity to the open end formed around one end face via the second gap 7. The control electrode 8 is grounded via a switch 9, and the power supply electrode 6 is connected to a signal source 10 to form an antenna device 11 as a whole.
【００１３】ここで、図２に、周波数切換型表面実装型
アンテナ１を含むアンテナ装置１１の等価回路を示し、
図１と図２を使ってその動作を説明する。なお、図２に
おいて、図１と同一もしくは同等の部分には同じ記号を
付し、その説明を省略する。Here, FIG. 2 shows an equivalent circuit of an antenna device 11 including the frequency switching type surface mount type antenna 1,
The operation will be described with reference to FIGS. In FIG. 2, the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.
【００１４】図２において、Ｃ１は給電電極６とグラン
ド電極３の間で形成される静電容量を、Ｃ２は給電電極
６と放射電極４の開放端との間で形成される静電容量
を、Ｃ３は放射電極４の開放端とグランド電極３の間で
形成される静電容量を、Ｃ４は放射電極４の開放端と制
御電極８の間で形成される静電容量を表している。ここ
で、信号源１０は静電容量Ｃ２を介して放射電極４の一
端に接続され、放射電極４の他端は接地されている。静
電容量Ｃ２の信号源１０との接続部は、静電容量Ｃ１を
介して接地されている。静電容量Ｃ２の放射電極４との
接続部は、静電容量Ｃ３を介して接地されると共に、静
電容量Ｃ４とスイッチ９を直列に介して接地されてい
る。In FIG. 2, C1 represents the capacitance formed between the power supply electrode 6 and the ground electrode 3, and C2 represents the capacitance formed between the power supply electrode 6 and the open end of the radiation electrode 4. , C3 represent the capacitance formed between the open end of the radiation electrode 4 and the ground electrode 3, and C4 represents the capacitance formed between the open end of the radiation electrode 4 and the control electrode 8. Here, the signal source 10 is connected to one end of the radiation electrode 4 via the capacitance C2, and the other end of the radiation electrode 4 is grounded. The connection of the capacitance C2 with the signal source 10 is grounded via the capacitance C1. The connection between the capacitance C2 and the radiation electrode 4 is grounded via the capacitance C3, and also grounded via the capacitance C4 and the switch 9 in series.
【００１５】このように構成されたアンテナ装置１１に
おいて、信号源１０から給電電極６に入力された信号
は、第１のギャップ５の部分に形成される静電容量Ｃ２
を介して放射電極４に入力される。放射電極４は、一端
が開放、他端が短絡の長さがλ／４のマイクロストリッ
プ線路共振器として、これに並列に加わる静電容量Ｃ３
と共に共振する。そして、その共振の電力の一部が空間
に放射されることによって周波数切換型表面実装型アン
テナ１はアンテナとして機能する。In the antenna device 11 configured as described above, a signal input from the signal source 10 to the power supply electrode 6 has a capacitance C 2 formed in the first gap 5.
Is input to the radiation electrode 4 via the. The radiation electrode 4 is a microstrip line resonator whose one end is open and the other end is short-circuited and has a length of λ / 4.
Resonates with. Then, a part of the power of the resonance is radiated to the space, so that the frequency switching type surface mount antenna 1 functions as an antenna.
【００１６】ここで、静電容量Ｃ４は、スイッチ９がオ
フの場合はどこにも接続されないが、スイッチ９がオン
になると放射電極４の開放端とグランド電極３との間の
静電容量として、静電容量Ｃ３に並列に接続されること
になる。そのため、周波数切換型表面実装型アンテナ１
の共振周波数は、スイッチ９がオンの時の方がオフの時
に比べて静電容量Ｃ４の分だけ共振周波数が低下する。
この結果、アンテナ装置１１は、スイッチ９がオフの時
に高い周波数帯域に対応し、スイッチ９がオンの時に低
い周波数帯域に対応するアンテナとして機能することが
できる。このようにして、アンテナ装置１１は１つで複
数の周波数帯域に対応することができるようになる。ま
た、１つの表面実装型アンテナを共振周波数を切り換え
て使用することにより、複数の表面実装型アンテナを使
用する必要がなくなり、表面実装型アンテナの実装面積
を縮小し、アンテナ装置のコストダウンを図ることがで
きる。Here, the capacitance C4 is not connected anywhere when the switch 9 is off, but when the switch 9 is on, the capacitance C4 is the capacitance between the open end of the radiation electrode 4 and the ground electrode 3. It will be connected in parallel to the capacitance C3. Therefore, the frequency switching type surface mount antenna 1
Is lower by the capacitance C4 when the switch 9 is on than when it is off.
As a result, the antenna device 11 can function as an antenna corresponding to a high frequency band when the switch 9 is off, and function as an antenna corresponding to a low frequency band when the switch 9 is on. In this way, one antenna device 11 can support a plurality of frequency bands. Further, by using one surface-mounted antenna by switching its resonance frequency, it is not necessary to use a plurality of surface-mounted antennas, thereby reducing the mounting area of the surface-mounted antenna and reducing the cost of the antenna device. be able to.
【００１７】なお、周波数切り換え用のスイッチとして
はダイオードやトランジスタ、ＦＥＴなどを用いること
ができる。Note that a diode, transistor, FET, or the like can be used as a switch for switching the frequency.
【００１８】図３に、本発明の周波数切換型表面実装型
アンテナおよびそれを用いたアンテナ装置の別の実施例
を示す。図３において、図１と同一もしくは同等の部分
には同じ記号を付し、その説明を省略する。FIG. 3 shows another embodiment of the frequency switching type surface mount antenna of the present invention and an antenna device using the same. 3, the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
【００１９】図３において、周波数切換型表面実装型ア
ンテナ２０は、基体２の他方主面から部分的に１つの端
面に回り込んで形成された放射電極２１の開放端の近傍
に、それぞれ第２のギャップ２２、２３、２４を介して
近接して、基体２の１つの端面から一方主面にかけて形
成された制御電極２５、２６、２７を有する。制御電極
２５、２６、２７は、それぞれスイッチ２８、２９、３
０を介して接地されて、全体としてアンテナ装置３１を
形成している。In FIG. 3, the frequency-switching type surface mount antenna 20 has a second surface near the open end of the radiation electrode 21 formed partially from one of the other main surfaces of the base 2 to one end surface. And control electrodes 25, 26, 27 formed from one end face to one main face of the base 2 in proximity via the gaps 22, 23, 24. The control electrodes 25, 26, 27 are connected to switches 28, 29, 3 respectively.
The antenna device 31 is formed as a whole by being grounded via the line “0”.
【００２０】ここで、図４に、周波数切換型表面実装型
アンテナ２０を含むアンテナ装置３１の等価回路を示
す。なお、図４において、図２で説明した点については
省略する。また、図３と同一もしくは同等の部分には同
じ記号を付し、その説明を省略する。FIG. 4 shows an equivalent circuit of an antenna device 31 including the frequency switching type surface mount antenna 20. In FIG. 4, the points described in FIG. 2 are omitted. The same or equivalent parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.
【００２１】図４において、Ｃ５、Ｃ６、Ｃ７は、放射
電極２１の開放端と制御電極２５、２６、２７の間でそ
れぞれ形成される静電容量を表している。In FIG. 4, C5, C6 and C7 represent capacitances formed between the open end of the radiation electrode 21 and the control electrodes 25, 26 and 27, respectively.
【００２２】このように構成されたアンテナ装置３１に
おいては、アンテナ装置１１と同様の原理で、スイッチ
２８、２９、３０をオンにすることにより、オフの時に
比べて共振周波数を低下させることができる。この場
合、３つのスイッチのオン−オフの組み合わせによって
共振周波数を８通りに切り換えることができ、アンテナ
装置１１よりもさらに幅広い周波数範囲に対応できるよ
うになる。In the antenna device 31 configured as described above, by turning on the switches 28, 29, and 30 according to the same principle as the antenna device 11, the resonance frequency can be reduced as compared with when the switches are off. . In this case, the resonance frequency can be switched in eight ways by a combination of ON and OFF of the three switches, and a wider frequency range than that of the antenna device 11 can be handled.
【００２３】図５に、本発明の周波数切換型表面実装型
アンテナおよびそれを用いたアンテナ装置のさらに別の
実施例を示す。図５において、周波数切換型表面実装型
アンテナ４０は、誘電体からなり、一方主面と他方主面
と４つの端面を有する直方体状の基体４１と、基体４１
の１つの端面から一方主面にかけて形成されたグランド
電極４２と、主に基体４１の他方主面に形成され、一端
が１つの端面に回り込んで開放端を形成し、他端がグラ
ンド電極４２に接続されたストリップ状の放射電極４３
と、放射電極４３の開放端に対応して、基体４１の一方
主面から１つの端面を介して他方主面にかけて形成され
た給電電極４４と、放射電極４３の開放端にギャップ４
５を介して近接して、基体４１の１つの端面から一方主
面にかけて形成された制御電極４６からなる。そして、
制御電極４６はスイッチ４７を介して接地され、また、
給電電極４４は信号源４８に接続されて、全体としてア
ンテナ装置４９を形成している。FIG. 5 shows still another embodiment of the frequency switching type surface mount antenna of the present invention and an antenna device using the same. In FIG. 5, a frequency switching type surface mount antenna 40 is made of a dielectric material, and has a rectangular parallelepiped base 41 having one main surface, the other main surface, and four end surfaces;
A ground electrode 42 formed from one end surface to one main surface of the base member 41, and a ground electrode 42 formed mainly on the other main surface of the base 41, one end of which goes around one end surface to form an open end, and the other end forms a ground electrode 42. Strip-shaped radiation electrode 43 connected to
And a feed electrode 44 formed from one main surface of the base 41 through one end surface to the other main surface corresponding to the open end of the radiation electrode 43, and a gap 4 at the open end of the radiation electrode 43.
The control electrode 46 is formed from one end face to one main face of the base 41 in close proximity to the base 41. And
The control electrode 46 is grounded via a switch 47, and
The power supply electrode 44 is connected to a signal source 48 to form an antenna device 49 as a whole.
【００２４】ここで、図６に、周波数切換型表面実装型
アンテナ４０を含むアンテナ装置４９の等価回路を示
し、図５と図６を使ってその動作を説明する。なお、図
６において、図５と同一もしくは同等の部分には同じ記
号を付し、その説明を省略する。FIG. 6 shows an equivalent circuit of an antenna device 49 including the frequency switching type surface mount antenna 40, and its operation will be described with reference to FIGS. In FIG. 6, the same or equivalent parts as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.
【００２５】図６において、Ｃ８は給電電極４４とグラ
ンド電極４２の間で形成される静電容量を、Ｃ９は給電
電極４４と放射電極４３の開放端との間で形成される静
電容量を、Ｃ１０は放射電極４３の開放端とグランド電
極４２の間で形成される静電容量を、Ｃ１１は放射電極
４３の開放端と制御電極４６の間で形成される静電容量
を表している。ここで、信号源４８は静電容量Ｃ９を介
して放射電極４３の一端に接続され、放射電極４３の他
端は接地されている。静電容量Ｃ９の信号源４８との接
続部は、静電容量Ｃ８を介して接地されている。静電容
量Ｃ９の放射電極４３との接続部は、静電容量Ｃ１０を
介して接地されると共に、静電容量Ｃ１１とスイッチ４
７を直列に介して接地されている。In FIG. 6, C8 is the capacitance formed between the power supply electrode 44 and the ground electrode 42, and C9 is the capacitance formed between the power supply electrode 44 and the open end of the radiation electrode 43. , C10 represent the capacitance formed between the open end of the radiation electrode 43 and the ground electrode 42, and C11 represents the capacitance formed between the open end of the radiation electrode 43 and the control electrode 46. Here, the signal source 48 is connected to one end of the radiation electrode 43 via the capacitance C9, and the other end of the radiation electrode 43 is grounded. The connection of the capacitance C9 with the signal source 48 is grounded via the capacitance C8. The connection between the capacitance C9 and the radiation electrode 43 is grounded via the capacitance C10, and the capacitance C11 and the switch 4 are connected.
7 are grounded in series.
【００２６】このように構成されたアンテナ装置４９に
おいて、信号源４８から給電電極４４に入力された信号
は、給電電極４４と放射電極４３の開放端との間に形成
される静電容量Ｃ９を介して放射電極４３に入力され
る。放射電極４３は、放射電極４３自身の持つインダク
タンス成分と静電容量Ｃ１０との並列回路として共振す
る。そして、その共振の電力の一部が空間に放射される
ことによって周波数切換型表面実装型アンテナ４０はル
ープアンテナとして機能する。In the antenna device 49 configured as described above, the signal input from the signal source 48 to the feed electrode 44 causes the capacitance C9 formed between the feed electrode 44 and the open end of the radiation electrode 43 to pass through. The radiation is input to the radiation electrode 43 via the radiating electrode 43. The radiation electrode 43 resonates as a parallel circuit of the inductance component of the radiation electrode 43 itself and the capacitance C10. Then, a part of the resonance power is radiated to the space, so that the frequency switching type surface mount antenna 40 functions as a loop antenna.
【００２７】ここで、静電容量Ｃ１１は、スイッチ４７
がオフの場合はどこにも接続されないが、スイッチ４７
がオンになると放射電極４３の開放端とグランド電極４
２との間の静電容量として、静電容量Ｃ１０に並列に接
続されることになる。そのため、周波数切換型表面実装
型アンテナ４０の共振周波数は、スイッチ４７がオンの
時の方がオフの時に比べて静電容量Ｃ１１の分だけ共振
周波数が低下する。この結果、アンテナ装置４９は、ス
イッチ４７がオフの時に高い周波数帯域に対応し、スイ
ッチ４７がオンの時に低い周波数帯域に対応するアンテ
ナとして機能することができる。これは、例えばＧＳＭ
方式の携帯電話のように送信側の周波数帯域が受信側の
周波数帯域よりも低いシステムにおいて、スイッチとし
てダイオードを用いる場合に特に役に立つ。すなわち、
アンテナに流れる信号のレベルが高くなる送信時に、信
号の歪みの原因となるダイオードを歪みが少なくなるＯ
Ｎ状態で使うことができ、歪みの少ない状態で周波数の
切り換えを行うことができる。このようにして、アンテ
ナ装置４９は１つで複数の周波数帯域に対応することが
できるようになる。Here, the capacitance C11 is determined by the switch 47
Is off, no connection is made, but switch 47
Is turned on, the open end of the radiation electrode 43 and the ground electrode 4
2 is connected in parallel with the capacitance C10. Therefore, the resonance frequency of the frequency switching type surface mount antenna 40 is lower when the switch 47 is on than by the capacitance C11 when the switch 47 is off. As a result, the antenna device 49 can function as an antenna corresponding to a high frequency band when the switch 47 is off, and can function as an antenna corresponding to a low frequency band when the switch 47 is on. This is for example GSM
It is particularly useful when a diode is used as a switch in a system in which the frequency band on the transmitting side is lower than the frequency band on the receiving side, such as a cellular phone of the system. That is,
When transmitting a signal in which the level of the signal flowing through the antenna is high, a diode which causes signal distortion is reduced by O.
It can be used in the N state, and the frequency can be switched with little distortion. In this way, one antenna device 49 can handle a plurality of frequency bands.
【００２８】なお、図５の周波数切換型表面実装型アン
テナにおいては、放射電極４３は主として基体４１の他
方主面に形成されているが、これは他方主面に限るもの
ではなく、一方主面や４つの端面も含めていくつの面に
渡って連続して形成されていても構わない。In the frequency switching type surface mount antenna shown in FIG. 5, the radiation electrode 43 is mainly formed on the other main surface of the base 41, but this is not limited to the other main surface. It may be formed continuously over any number of surfaces including the four end surfaces.
【００２９】以上の実施例の中で、図１および図５の周
波数切換型表面実装型アンテナにおいては制御電極の数
を１つとし、図３の周波数切換型表面実装型アンテナに
おいては制御電極の数を３つとしたが、制御電極の数は
１つあるいは３つに限るものではなく、必要に応じて１
つ以上いくつ設けても構わない。また、図１、図３の周
波数切換型表面実装型アンテナにおいては放射電極をほ
ぼ直線状とし、図５の周波数切換型表面実装型アンテナ
においては放射電極をＬ字状としたが、放射電極の形状
はこれに限るものではなく、コ字状やミアンダ状など、
どのような形状としても構わない。さらに、上記の各実
施例では、周波数切換型表面実装型アンテナの基体とし
て誘電体を用いたものについて述べたが、基体として磁
性体を用いて構成することもできる。In the above embodiment, the number of control electrodes is one in the frequency switching type surface mount antenna of FIGS. 1 and 5, and the number of control electrodes is one in the frequency switching type surface mount antenna of FIG. Although the number is set to three, the number of control electrodes is not limited to one or three.
More than one may be provided. Further, in the frequency switching type surface mount antenna of FIGS. 1 and 3, the radiation electrode is made substantially linear, and in the frequency switching type surface mount antenna of FIG. 5, the radiation electrode is made L-shaped. The shape is not limited to this, such as U-shape and meander shape
Any shape may be used. Further, in each of the embodiments described above, the case where a dielectric is used as the base of the frequency switching type surface mount antenna has been described. However, it is also possible to use a magnetic body as the base.
【００３０】図７に、本発明のアンテナ装置１１を用い
た、本発明の通信機の一実施例を示す。図７において、
図１と同一もしくは同等の部分には同じ記号を付し、そ
の説明を省略する。図７において、通信機５０は筐体５
１の中に実装基板５２が設けられ、実装基板５２にはグ
ランド電極５３、給電線路５４、およびスイッチ線路５
５が形成されている。本発明の表面実装型アンテナ１は
実装基板５２のコーナー部分に搭載され、さらに表面実
装型アンテナ１の制御電極（図示せず）をスイッチ線路
５５を介してスイッチ９と接続してアンテナ装置１１を
構成している。表面実装型アンテナ１の給電端子は実装
基板５２の給電線路５４に接続されている。さらに、給
電線路５４は実装基板５２上に形成された切換回路５６
を介して、同じく実装基板５２上に形成された送信回路
５７および受信回路５８に接続されている。FIG. 7 shows an embodiment of the communication device of the present invention using the antenna device 11 of the present invention. In FIG.
Parts that are the same as or equivalent to those in FIG. 1 are given the same symbols, and descriptions thereof are omitted. In FIG. 7, the communication device 50 is a housing 5
1, a mounting substrate 52 is provided, and the mounting substrate 52 includes a ground electrode 53, a power supply line 54, and a switch line 5.
5 are formed. The surface-mounted antenna 1 of the present invention is mounted on a corner portion of a mounting board 52, and a control electrode (not shown) of the surface-mounted antenna 1 is connected to a switch 9 via a switch line 55 to connect the antenna device 11. Make up. A power supply terminal of the surface mount antenna 1 is connected to a power supply line 54 of the mounting board 52. Further, the power supply line 54 is connected to a switching circuit 56 formed on the mounting substrate 52.
Are connected to a transmission circuit 57 and a reception circuit 58 which are also formed on the mounting board 52.
【００３１】このように、本発明のアンテナ装置１１を
用いることにより、小型で、低コストで複数の周波数帯
域に対応できる通信機を構成することができる。As described above, by using the antenna device 11 of the present invention, it is possible to configure a communication device that is small in size and low in cost and can support a plurality of frequency bands.
【００３２】なお、図７の実施例においては図１に示し
たアンテナ装置１１を用いて通信機５０を構成したが、
図３、図５に示したアンテナ装置３１、４９を用いて通
信機を構成しても同様の作用効果を奏するものである。In the embodiment shown in FIG. 7, the communication device 50 is constituted by using the antenna device 11 shown in FIG.
Even when a communication device is configured using the antenna devices 31 and 49 shown in FIGS. 3 and 5, the same operation and effect can be obtained.
【００３３】[0033]
【発明の効果】本発明の周波数切換型表面実装型アンテ
ナおよびそれを用いたアンテナ装置によれば、周波数切
換型表面実装型アンテナの放射電極の開放端とその近傍
にそれぞれギャップを介して近接して１つ以上の制御電
極を設け、この制御電極をスイッチを介して接地して、
スイッチのオン−オフによって制御電極の接地、非接地
を制御することにより、表面実装型アンテナの共振周波
数を切り換え、複数の周波数帯域に対応させることがで
きる。また、複数の表面実装型アンテナを使用する必要
がなくなり、表面実装型アンテナの実装面積を縮小し、
アンテナ装置のコストダウンを図ることができる。According to the frequency switching type surface mount antenna and the antenna device using the same according to the present invention, the open end of the radiation electrode of the frequency switching type surface mount antenna and the vicinity thereof are close to each other via the gap. Providing at least one control electrode, and grounding this control electrode via a switch;
By controlling whether the control electrode is grounded or not grounded by turning the switch on and off, the resonance frequency of the surface mount antenna can be switched to correspond to a plurality of frequency bands. Also, there is no need to use multiple surface mount antennas, reducing the mounting area of surface mount antennas,
The cost of the antenna device can be reduced.
【００３４】また、本発明の通信機によれば、本発明の
アンテナ装置を用いることにより、複数の周波数帯域に
対応できるようになり、しかも小型化と低価格化をはか
ることができる。Further, according to the communication device of the present invention, by using the antenna device of the present invention, it becomes possible to support a plurality of frequency bands, and it is possible to reduce the size and cost.
【図１】本発明の周波数切換型表面実装型アンテナおよ
びそれを用いたアンテナ装置の一実施例を示す斜視図で
ある。FIG. 1 is a perspective view showing one embodiment of a frequency switching type surface mount antenna of the present invention and an antenna device using the same.
【図２】図１のアンテナ装置の等価回路を示す回路図で
ある。FIG. 2 is a circuit diagram showing an equivalent circuit of the antenna device of FIG.
【図３】本発明の周波数切換型表面実装型アンテナおよ
びそれを用いたアンテナ装置の別の実施例を示す斜視図
である。FIG. 3 is a perspective view showing another embodiment of the frequency switching type surface mount antenna of the present invention and an antenna device using the same.
【図４】図３のアンテナ装置の等価回路を示す回路図で
ある。FIG. 4 is a circuit diagram illustrating an equivalent circuit of the antenna device of FIG. 3;
【図５】本発明の周波数切換型表面実装型アンテナおよ
びそれを用いたアンテナ装置のさらに別の実施例を示す
斜視図である。FIG. 5 is a perspective view showing still another embodiment of the frequency switching type surface mount antenna of the present invention and an antenna device using the same.
【図６】図５のアンテナ装置の等価回路を示す回路図で
ある。6 is a circuit diagram showing an equivalent circuit of the antenna device of FIG.
【図７】本発明の通信機の一実施例を示す斜視図であ
る。FIG. 7 is a perspective view showing an embodiment of the communication device of the present invention.
【図８】従来の表面実装型アンテナおよびそれを用いた
アンテナ装置を示す斜視図である。FIG. 8 is a perspective view showing a conventional surface mount antenna and an antenna device using the same.
１、２０、４０…周波数切換型表面実装型アンテナ ２…基体 ３…グランド電極 ４、２１、４３…放射電極 ５…第１のギャップ ６、４４…給電電極 ７、２２，２３、２４、４５…第２のギャップ ８、２５、２６、２７、４６…制御電極 ９、２８、２９、３０、４７…スイッチ １０、４８…信号源 １１、３１、４９…アンテナ装置 ５０…通信機 1, 20, 40: frequency switching type surface mount antenna 2: base body 3: ground electrode 4, 21, 43: radiation electrode 5: first gap 6, 44: feeding electrode 7, 22, 23, 24, 45 ... Second gap 8, 25, 26, 27, 46 Control electrode 9, 28, 29, 30, 47 Switch 10, 48 Signal source 11, 31, 49 Antenna device 50 Communication device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０１Ｑ 21/30 Ｈ０１Ｑ 21/30 23/00 23/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI H01Q 21/30 H01Q 21/30 23/00 23/00
Claims (4)
と他方主面と４つの端面を有する直方体状の基体と、 前記基体の一方主面のほぼ全面に形成されたグランド電
極と、 前記基体の少なくとも他方主面に形成され、一端が前記
基体の他方主面あるいはいずれかの端面で開放端を形成
し、他端が前記基体のいずれかの端面を介して前記グラ
ンド電極と接続されたストリップ状の放射電極と、 前記放射電極の開放端に第１のギャップを介して近接し
て形成した給電電極と、 前記放射電極の開放端またはその近傍において、前記放
射電極とそれぞれ第２のギャップを介して近接して形成
した１つ以上の制御電極を有することを特徴とする周波
数切換型表面実装型アンテナ。1. A rectangular parallelepiped substrate made of a dielectric or magnetic material and having one main surface, the other main surface, and four end surfaces; a ground electrode formed on substantially the entire one main surface of the base; One end formed on at least the other main surface of the base, one end formed an open end on the other main surface or any end surface of the base, and the other end was connected to the ground electrode via any end surface of the base. A strip-shaped radiation electrode; a feeding electrode formed in close proximity to an open end of the radiation electrode via a first gap; and a second gap with the radiation electrode at or near the open end of the radiation electrode. A frequency-switching surface-mount antenna having one or more control electrodes formed close to each other through a control electrode.
と他方主面と４つの端面を有する直方体状の基体と、 前記基体の少なくともいずれか１つの面に形成されたグ
ランド電極と、 前記基体の１つ以上の面に渡って形成され、一端が前記
基体のいずれかの面で開放端を形成し、他端が前記グラ
ンド電極と接続されたストリップ状の放射電極と、 前記放射電極の開放端に対応して、前記基体のいずれか
の面に形成した給電電極と、 前記放射電極の開放端またはその近傍において、前記放
射電極とそれぞれギャップを介して近接して形成した１
つ以上の制御電極を有することを特徴とする周波数切換
型表面実装型アンテナ。2. A rectangular parallelepiped base made of a dielectric or magnetic substance and having one main surface, another main surface, and four end surfaces; a ground electrode formed on at least one surface of the base; A strip-shaped radiation electrode formed over one or more surfaces of the substrate, one end of which forms an open end on any surface of the substrate, and the other end connected to the ground electrode; A power supply electrode formed on any surface of the base corresponding to the open end, and a feed electrode formed at or near the open end of the radiation electrode via a gap at the open end of the radiation electrode.
A frequency switching type surface mount antenna having at least one control electrode.
表面実装型アンテナと、 一端が前記周波数切換型表面実装型アンテナの前記制御
電極に接続され、他端が前記グランド電極に接続され、
前記制御電極と前記グランド電極との接続を制御するス
イッチを有することを特徴とするアンテナ装置。3. The frequency-switching surface-mount antenna according to claim 1, wherein one end is connected to the control electrode of the frequency-switching surface-mount antenna, and the other end is connected to the ground electrode.
An antenna device comprising a switch for controlling connection between the control electrode and the ground electrode.
ことを特徴とする通信機。4. A communication device using the antenna device according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10204902A JPH11136025A (en) | 1997-08-26 | 1998-07-21 | Frequency switching type surface mounting antenna, antenna device using the antenna and communication unit using the antenna device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9-229590 | 1997-08-26 | ||
| JP22959097 | 1997-08-26 | ||
| JP10204902A JPH11136025A (en) | 1997-08-26 | 1998-07-21 | Frequency switching type surface mounting antenna, antenna device using the antenna and communication unit using the antenna device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11136025A true JPH11136025A (en) | 1999-05-21 |
Family
ID=26514723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10204902A Pending JPH11136025A (en) | 1997-08-26 | 1998-07-21 | Frequency switching type surface mounting antenna, antenna device using the antenna and communication unit using the antenna device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11136025A (en) |
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