JPH114113A - Surface mount antenna and communication apparatus using the same - Google Patents
Surface mount antenna and communication apparatus using the sameInfo
- Publication number
- JPH114113A JPH114113A JP10081335A JP8133598A JPH114113A JP H114113 A JPH114113 A JP H114113A JP 10081335 A JP10081335 A JP 10081335A JP 8133598 A JP8133598 A JP 8133598A JP H114113 A JPH114113 A JP H114113A
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- electrodes
- radiation
- electrode
- antenna
- base
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、表面実装型アンテ
ナおよびそれを用いた通信機、特に広い周波数帯域や複
数の周波数に対応した携帯電話などの移動体通信機器に
用いられる表面実装型アンテナ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 surface-mounted antenna and a communication device using the same, and more particularly, to a surface-mounted antenna used for a mobile communication device such as a portable telephone supporting a wide frequency band and a plurality of frequencies. It relates to a communication device using the same.
【０００２】[0002]
【従来の技術】一般にアンテナの広帯域化を図る場合、
アンテナの放射抵抗を下げたり、放射電極の幅を広げた
りしていた。また、複数の周波数の信号を扱いたいとき
には複数のアンテナをそれぞれ使用していた。2. Description of the Related Art Generally, when broadening an antenna,
The radiation resistance of the antenna was reduced, and the width of the radiation electrode was increased. When it is desired to handle signals of a plurality of frequencies, a plurality of antennas are used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、広帯域
化をしてアンテナ利得を維持するために放射電極の幅を
広くするとアンテナのサイズが大きくなり、小形化に限
界があった。また、複数のアンテナを使用するために
は、実装基板上のアンテナを搭載するのに必要な面積が
大きくなり、これを搭載する通信機の小形化を妨げてい
た。However, if the width of the radiating electrode is increased in order to maintain the antenna gain by widening the band, the size of the antenna becomes large, and there is a limit to miniaturization. Further, in order to use a plurality of antennas, the area required for mounting the antenna on the mounting board becomes large, which hinders downsizing of a communication device on which the antenna is mounted.
【０００４】そこで、本発明は、形状を大きくすること
なく、広帯域化、周波数の複数化を図ることのできる表
面実装型アンテナ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。Accordingly, an object of the present invention is to provide a surface mount antenna capable of achieving a wider band and a plurality of frequencies without increasing the size, and a communication device using the same.
【０００５】[0005]
【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、本発明の表面実装型アンテナは、絶縁体よりなる
直方体状の基体の、一方主面にグランド電極が形成さ
れ、前記基体の少なくとも他方主面にストリップ状の複
数の放射電極が形成された表面実装型アンテナであっ
て、前記複数の放射電極の一端はそれぞれ前記基体の他
方主面あるいはいずれかの端面で開放端を形成し、他端
はそれぞれ前記グランド電極と接続し、前記複数の放射
電極の一端に、それぞれギャップを介して複数の給電電
極の一端を形成し、前記複数の給電電極の他端は前記基
体のいずれかの面に形成された結合電極に接続されてい
ることを特徴とする。In order to solve the above-mentioned problems, a surface-mounted antenna according to the present invention comprises a rectangular parallelepiped base made of an insulator, a ground electrode formed on one principal surface of the base, A surface-mounted antenna in which a plurality of strip-shaped radiation electrodes are formed on at least the other main surface, and one end of each of the plurality of radiation electrodes forms an open end on the other main surface or any end surface of the base. The other end is connected to the ground electrode, and one end of each of the plurality of feed electrodes is formed at one end of each of the plurality of radiation electrodes via a gap, and the other end of each of the plurality of feed electrodes is one of the bases. Characterized by being connected to the coupling electrode formed on the surface.
【０００６】また、本発明の表面実装型アンテナは、絶
縁体よりなる直方体状の基体の、一方主面と他方主面と
４つの端面の少なくとも１つの面に、複数のグランド電
極と、ストリップ状の複数の放射電極が形成された表面
実装型アンテナであって、前記複数の放射電極の一端は
それぞれ開放端を形成し、他端は前記複数のグランド電
極とそれぞれ接続し、前記複数の放射電極の一端にそれ
ぞれギャップを介して複数の給電電極の一端を形成し、
前記複数の給電電極の他端は前記基体のいずれかの面に
形成された結合電極に接続されていることを特徴とす
る。The surface-mounted antenna according to the present invention is characterized in that a rectangular parallelepiped base made of an insulator is provided with a plurality of ground electrodes and a strip-shaped substrate on at least one of one main surface, the other main surface and four end surfaces. A plurality of radiation electrodes are formed, wherein one end of each of the plurality of radiation electrodes forms an open end, the other end is connected to each of the plurality of ground electrodes, and the plurality of radiation electrodes Forming one end of a plurality of power supply electrodes via a gap at one end thereof,
The other ends of the plurality of power supply electrodes are connected to coupling electrodes formed on any surface of the base.
【０００７】また、本発明の表面実装型アンテナは、前
記複数の放射電極の開放端に、それぞれギャップを介し
て近接してグランド電極を形成したことを特徴とする。The surface mount antenna according to the present invention is characterized in that ground electrodes are formed close to the open ends of the plurality of radiation electrodes via gaps.
【０００８】また、本発明の表面実装型アンテナは、前
記複数の放射電極は、互いに共振周波数が異なることを
特徴とする。In the surface mount antenna according to the present invention, the plurality of radiation electrodes have different resonance frequencies from each other.
【０００９】また、本発明の通信機は、上記の表面実装
型アンテナを搭載したことを特徴とする。A communication device according to the present invention is characterized in that the above-mentioned surface mount antenna is mounted.
【００１０】このように、構成することにより、本発明
の表面実装型アンテナによれば、複数の周波数で利用可
能なアンテナを形成したり、周波数帯域の足し合わせに
よる広帯域のアンテナを形成することができる。また、
放射電極のレイアウトの自由度が高くなり、放射電極間
の相互干渉を小さくすることができる。With this configuration, according to the surface mount antenna of the present invention, it is possible to form an antenna that can be used at a plurality of frequencies or to form a broadband antenna by adding frequency bands. it can. Also,
The degree of freedom in the layout of the radiation electrodes is increased, and mutual interference between the radiation electrodes can be reduced.
【００１１】また、本発明の通信機においては、小型化
と特性の改善を図ることができる。Further, in the communication device of the present invention, miniaturization and improvement of characteristics can be achieved.
【００１２】[0012]
【発明の実施の形態】図１に、本発明の表面実装型アン
テナの一実施例を示す。図１において、表面実装型アン
テナ１は、絶縁体の１つであるセラミックス、樹脂等の
誘電体からなる直方体状の基体２と、基体２の一方主面
に形成されたグランド電極３、基体２の他方主面に形成
されたストリップ状の長さλ／４近似の２つの放射電極
４および５、２つの給電電極６および７、結合電極８で
構成されている。このうち、放射電極４および５はミア
ンダ状に折れ曲がり、その一端は開放端を形成し、他端
は基体２の１つの端面を介してグランド電極３に接続さ
れている。また、給電電極６および７の一端は、それぞ
れ放射電極４および５の一端と、ギャップｇ１およびｇ
２を介して形成され、他端は基体２の１つの端面に対向
する別の端面において、ともに結合電極８に接続されて
いる。さらに、放射電極４は放射電極５より少し長く形
成されている。なお、９は固定電極で、表面実装型アン
テナ１を基板に実装するときに、基板上の電極との間で
半田付けされる。FIG. 1 shows an embodiment of a surface mount antenna according to the present invention. In FIG. 1, a surface-mounted antenna 1 includes a rectangular parallelepiped base 2 made of a dielectric such as ceramics or resin, which is one of insulators, a ground electrode 3 formed on one main surface of the base 2, and a base 2. And two radiating electrodes 4 and 5 having a length of approximately λ / 4, two feeding electrodes 6 and 7 and a coupling electrode 8 which are formed on the other main surface of the. Among these, the radiation electrodes 4 and 5 are bent in a meandering shape, one end of which forms an open end, and the other end is connected to the ground electrode 3 via one end surface of the base 2. One end of each of the feeding electrodes 6 and 7 is connected to one end of each of the radiation electrodes 4 and 5 and the gaps g1 and g, respectively.
2, and the other end is connected to the coupling electrode 8 at another end face facing one end face of the base 2. Further, the radiation electrode 4 is formed slightly longer than the radiation electrode 5. Reference numeral 9 denotes a fixed electrode, which is soldered to an electrode on the substrate when the surface mount antenna 1 is mounted on the substrate.
【００１３】本実施例の電気的等価回路を図２に示す。
図２において、表面実装型アンテナ１の等価回路は、放
射電極４および５の自己インダクタンスであるインダク
タＬ１およびＬ２、放射電極４および５から放射するエ
ネルギーを抵抗による損失に置き換えた場合の抵抗とし
ての抵抗Ｒ１およびＲ２、放射電極４および５とグラン
ド電極２との間で形成される容量であるコンデンサＣ１
およびＣ２、放射電極４および５の一端と給電電極６お
よび７の一端との間で形成される容量であるコンデンサ
Ｃ３およびＣ４、そして信号入力端子ｐ１で構成され
る。このうちインダクタＬ１と抵抗Ｒ１は直列に接続さ
れ、これにコンデンサＣ１が並列に接続され、その一端
は接地され、他端はコンデンサＣ３を介して信号入力端
子ｐ１に接続されている。さらに、インダクタＬ２と抵
抗Ｒ２は直列に接続され、これにコンデンサＣ２が並列
に接続され、その一端は接地され、他端はコンデンサＣ
４を介して同じく信号入力端子ｐ１に接続されている。FIG. 2 shows an electrical equivalent circuit of this embodiment.
In FIG. 2, an equivalent circuit of the surface-mount antenna 1 has inductors L1 and L2, which are self-inductances of the radiation electrodes 4 and 5, and a resistance as a resistance when the energy radiated from the radiation electrodes 4 and 5 is replaced by a loss due to resistance. Capacitor C1 which is a capacitance formed between the resistances R1 and R2 and the radiation electrodes 4 and 5 and the ground electrode 2.
And C2, capacitors C3 and C4 which are capacitances formed between one ends of the radiation electrodes 4 and 5 and one ends of the feed electrodes 6 and 7, and a signal input terminal p1. The inductor L1 and the resistor R1 are connected in series, a capacitor C1 is connected in parallel to the inductor L1, and one end is grounded, and the other end is connected to the signal input terminal p1 via the capacitor C3. Further, the inductor L2 and the resistor R2 are connected in series, a capacitor C2 is connected in parallel with the inductor L2 and one end thereof is grounded, and the other end is connected to the capacitor C2.
4 is also connected to the signal input terminal p1.
【００１４】次に図２の等価回路を用いて、表面実装型
アンテナ１の動作を説明する。表面実装型アンテナ１の
共振回路は２つあり、１つは主としてインダクタＬ１、
抵抗Ｒ１、コンデンサＣ１で構成され、もう１つは主と
してインダクタＬ２、抵抗Ｒ２、コンデンサＣ２で構成
される。そして、２つの共振回路の共振周波数は異なる
ものとなっている。Next, the operation of the surface mount antenna 1 will be described with reference to the equivalent circuit shown in FIG. The surface-mounted antenna 1 has two resonance circuits, one of which is mainly an inductor L1,
It comprises a resistor R1 and a capacitor C1, and the other mainly comprises an inductor L2, a resistor R2 and a capacitor C2. The resonance frequencies of the two resonance circuits are different.
【００１５】信号入力端子ｐ１からコンデンサＣ３およ
びＣ４を介してそれぞれの共振回路に信号が入力される
と、その信号の周波数に応じていずれかもしくは両方の
共振回路で共振し、そのエネルギーの一部が空中に放射
され、アンテナとして機能する。この放射されるエネル
ギーは、等価回路的には抵抗Ｒ１およびＲ２で消費され
るエネルギーとして表されている。When a signal is input from the signal input terminal p1 to each of the resonance circuits via the capacitors C3 and C4, one or both of the resonance circuits resonate in accordance with the frequency of the signal, and a part of the energy is regenerated. Is radiated into the air and functions as an antenna. This radiated energy is represented as energy consumed by the resistors R1 and R2 in an equivalent circuit.
【００１６】図３および図４に、本実施例の表面実装型
アンテナの反射特性を示す。図３は２つの共振回路の共
振周波数の差が大きく相互の重なりがない場合を、図４
は２つの共振回路の共振周波数の差が小さく相互の重な
りがある場合を示している。これより、図３のように共
振周波数の差が大きいときには２つの異なる周波数に対
応するアンテナとして動作し、図４のように共振周波数
の差が小さいときには、２つの共振特性が重なって、帯
域の広いアンテナとして動作する。FIG. 3 and FIG. 4 show the reflection characteristics of the surface mount antenna of the present embodiment. FIG. 3 shows a case where the difference between the resonance frequencies of the two resonance circuits is large and there is no overlap between them.
Shows a case where the difference between the resonance frequencies of the two resonance circuits is small and there is mutual overlap. Thus, when the difference between the resonance frequencies is large as shown in FIG. 3, the antenna operates as an antenna corresponding to two different frequencies, and when the difference between the resonance frequencies is small as shown in FIG. Works as a wide antenna.
【００１７】このように、１つの基体に共振周波数の異
なる２つの共振回路を設けることにより２つの周波数を
有するアンテナとして機能させたり、２つの共振回路の
共振周波数の差を小さくしておくことによりアンテナの
周波数帯域を広げたりすることもできる。また、２つの
放射電極４および５に対してそれぞれ給電電極６および
７を設けることにより、放射電極のレイアウトの自由度
が広がり、また、２つの給電電極６および７と放射電極
４および５との間の容量が２つの放射電極４と５の間の
容量に比べて十分に大きいため、２つの放射電極４およ
び５の間の相互干渉を抑えることもできる。さらには、
放射電極４と５の形状や配置を変えることによりアンテ
ナの指向性パターンを変化させることもできる。そし
て、２つの放射電極を１つの基体に構成することによ
り、２つのアンテナを用いる場合に比べて小形化が実現
でき、実装コストの低減も可能となる。As described above, by providing two resonance circuits having different resonance frequencies on one base to function as an antenna having two frequencies, or by reducing the difference between the resonance frequencies of the two resonance circuits. It is also possible to extend the frequency band of the antenna. By providing the feed electrodes 6 and 7 for the two radiating electrodes 4 and 5, respectively, the degree of freedom of the layout of the radiating electrodes is increased, and the connection between the two feeding electrodes 6 and 7 and the radiating electrodes 4 and 5 is increased. Since the capacitance between the two radiation electrodes 4 and 5 is sufficiently larger than the capacitance between the two radiation electrodes 4 and 5, mutual interference between the two radiation electrodes 4 and 5 can also be suppressed. Furthermore,
By changing the shape and arrangement of the radiation electrodes 4 and 5, the directivity pattern of the antenna can be changed. By forming two radiation electrodes on one base, it is possible to reduce the size and to reduce the mounting cost as compared with the case where two antennas are used.
【００１８】本発明の表面実装型アンテナの別の実施例
を図５に示す。図５で、図１と同一もしくは同等の部分
には同じ記号を付し、その説明は省略する。図５に示し
た表面実装型アンテナ１０において、ストリップ状の長
さλ／４近似の２つの放射電極１１および１２が、基体
２の他方主面から１つの端面にかけて形成され、その一
端は１つの端面において開放端を形成し、他端は対向す
る別の端面を介してグランド電極３に接続されている。
また、放射電極１１および１２の開放端が形成された端
面において、放射電極１１および１２の一端に、それぞ
れギャップｇ３およびｇ４を介して２つの給電電極１３
および１４の一端が形成され、その他端は同じ端面にお
いてともに結合電極８に接続されている。さらに、放射
電極１１は放射電極１２より少し長く形成されている。FIG. 5 shows another embodiment of the surface mount antenna of the present invention. In FIG. 5, the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the surface-mounted antenna 10 shown in FIG. 5, two radiating electrodes 11 and 12 having a strip-like length λ / 4 approximation are formed from the other main surface of the base 2 to one end surface, and one end of the radiating electrode 11 is An open end is formed at the end face, and the other end is connected to the ground electrode 3 via another opposing end face.
In addition, on the end face where the open ends of the radiation electrodes 11 and 12 are formed, one end of each of the radiation electrodes 11 and 12 is connected to two power supply electrodes 13 via gaps g3 and g4, respectively.
And 14 are formed at one end, and the other end is connected to the coupling electrode 8 at the same end face. Further, the radiation electrode 11 is formed slightly longer than the radiation electrode 12.
【００１９】図５においては、放射電極１１および１２
の一端と給電電極１３および１４とが、基体２の他方主
面ではなく１つの端面に形成されている点のみが図１の
実施例とは異なるが、等価回路的には同等であり、図１
の実施例と同じように機能し、同様の作用・効果を示
す。In FIG. 5, the radiation electrodes 11 and 12
Is different from the embodiment of FIG. 1 only in that one end of the substrate 2 and the power supply electrodes 13 and 14 are formed on one end face instead of the other main surface of the base 2, but are equivalent in terms of an equivalent circuit. 1
It functions in the same way as the embodiment of the present invention and exhibits the same operation and effect.
【００２０】本発明の表面実装型アンテナのさらに別の
実施例を図６に示す。図６で、図１と同一もしくは同等
の部分には同じ記号を付し、その説明は省略する。図６
に示した表面実装型アンテナ２０において、ストリップ
状の長さλ／４近似の２つの放射電極２１および２２
が、基体２の他方主面に形成され、その一端は同じ他方
主面において開放端を形成し、他端はそれぞれ互いに対
向する２つの端面を介してグランド電極３に接続されて
いる。また、基体２の他方主面において、放射電極２１
および２２の一端とそれぞれギャップｇ５およびｇ６を
介して２つの給電電極２３および２４の一端が形成さ
れ、その他端は隣接する端面においてともに結合電極８
に接続されている。さらに、放射電極２１は放射電極２
２より少し長く形成されている。FIG. 6 shows still another embodiment of the surface mount antenna according to the present invention. 6, the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
In the surface-mounted antenna 20 shown in FIG. 2, two radiation electrodes 21 and 22 having a strip-like length λ / 4 approximation.
Is formed on the other main surface of the base 2, one end of which forms an open end on the same other main surface, and the other end is connected to the ground electrode 3 via two opposing end surfaces. Further, on the other main surface of the base 2, the radiation electrode 21
And 22 and one end of two power supply electrodes 23 and 24 are formed via gaps g5 and g6, respectively, and the other end is connected to the coupling electrode 8 at an adjacent end face.
It is connected to the. Further, the radiation electrode 21 is the radiation electrode 2
It is formed slightly longer than 2.
【００２１】図６においては、放射電極２１および２２
の他端が、基体２の同じ端面ではなく、それぞれ互いに
対向する２つの端面を介してグランド電極３に接続され
ている点のみが図１の実施例とは異なるが、等価回路的
には同等であり、同じように機能し、同様の作用・効果
を示す。In FIG. 6, the radiation electrodes 21 and 22 are shown.
Is different from the embodiment of FIG. 1 only in that the other end is connected not to the same end face of the base 2 but to the ground electrode 3 via two end faces opposed to each other, but equivalent to an equivalent circuit. , Functioning in the same way and exhibiting the same operation and effect.
【００２２】図７に、本発明の表面実装型アンテナのさ
らに別の実施例を示す。図７で、図１と同一もしくは同
等の部分には同じ記号を付し、その説明は省略する。図
７において、表面実装型アンテナ３０は、直方体状の基
体２と、基体２の１つの端面に設けられたグランド電極
３１および３２、基体２の他方主面に形成されたストリ
ップ状の２つの放射電極３３および３４、２つの給電電
極３５および３６、結合電極８で構成されている。この
うち、放射電極３３および３４はコ字状に形成され、そ
の一端は開放端を形成し、他端はグランド電極３１およ
び３２にそれぞれ接続されている。また、給電電極３５
および３６の一端は、基体２の他方主面において放射電
極３３および３４の一端と、それぞれギャップｇ７およ
びｇ８を介して形成され、他端は基体２の他方主面に隣
接する１つの端面において、ともに結合電極８に接続さ
れている。さらに、放射電極３３は放射電極３４より少
し長く形成されている。なお、３７は固定電極で、表面
実装型アンテナ３０を基板に実装するときに、基板上の
電極との間で半田付けされる。FIG. 7 shows still another embodiment of the surface mount antenna of the present invention. 7, the same or equivalent parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 7, the surface-mounted antenna 30 includes a rectangular parallelepiped base 2, ground electrodes 31 and 32 provided on one end face of the base 2, and two strip-shaped radiations formed on the other main surface of the base 2. It is composed of electrodes 33 and 34, two feeding electrodes 35 and 36, and a coupling electrode 8. Among them, the radiation electrodes 33 and 34 are formed in a U shape, one end of which forms an open end, and the other end is connected to the ground electrodes 31 and 32, respectively. In addition, the power supply electrode 35
And 36 are formed on the other main surface of the base 2 with the ends of the radiation electrodes 33 and 34 via gaps g7 and g8, respectively, and the other end is formed on one end surface adjacent to the other main surface of the base 2, Both are connected to the coupling electrode 8. Further, the radiation electrode 33 is formed slightly longer than the radiation electrode 34. Reference numeral 37 denotes a fixed electrode, which is soldered to an electrode on the substrate when the surface mount antenna 30 is mounted on the substrate.
【００２３】本実施例の電気的等価回路は、図１の実施
例における基体２の他方主面に形成された放射電極４お
よび５と基体２の一方主面に形成されたグランド電極３
との間の容量を表すコンデンサＣ１およびＣ２が、基体
２の他方主面に形成された放射電極３３および３４と基
体２の１つの端面に形成されたグランド電極３１および
３２、さらには表面実装型アンテナ３０を実装した基板
に形成されているグランド電極との間の容量に置き換え
られる以外は図２の等価回路と同等であり、図１の実施
例と同じように機能し、同様の作用・効果を示す。The electric equivalent circuit of this embodiment is composed of the radiation electrodes 4 and 5 formed on the other main surface of the base 2 and the ground electrode 3 formed on one main surface of the base 2 in the embodiment of FIG.
Capacitors C1 and C2, which represent capacitances between the first and second substrates, are radiating electrodes 33 and 34 formed on the other main surface of the base 2 and ground electrodes 31 and 32 formed on one end surface of the base 2, and a surface mount type. 2 is the same as the equivalent circuit of FIG. 2 except that the capacitance is replaced by a capacitance between the antenna 30 and the ground electrode formed on the substrate on which the antenna 30 is mounted. Is shown.
【００２４】本発明の表面実装型アンテナのさらに別の
実施例を図８に示す。図８で、図７と同一もしくは同等
の部分には同じ記号を付し、その説明は省略する。図８
に示した表面実装型アンテナ４０において、ストリップ
状の２つの放射電極４１および４２は基体２の１つの端
面から他方主面、別の端面、さらに他方主面にかけてコ
字状に形成され、その一端は１つの端面において開放端
を形成し、他端は同じ端面においてグランド電極３１お
よび３２に接続されている。また、基体２の１つの端面
において、放射電極４１および４２の一端と、それぞれ
ギャップｇ９およびｇ１０を介して給電電極４３および
４４の一端が形成され、その他端は同じ端面においてと
もに結合電極８に接続されている。さらに、放射電極４
１は放射電極４２より少し長く形成されている。なお、
４５は固定電極で、放射電極４１および４２と１つの端
面において接続されており、表面実装型アンテナ４０を
基板に実装するときに、基板上の電極との間で半田付け
される。FIG. 8 shows still another embodiment of the surface mount antenna according to the present invention. In FIG. 8, the same or equivalent parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
In the surface-mounted antenna 40 shown in FIG. 1, the two strip-shaped radiation electrodes 41 and 42 are formed in a U-shape from one end surface of the base 2 to the other main surface, another end surface, and the other main surface. Has an open end on one end face, and the other end is connected to ground electrodes 31 and 32 on the same end face. Further, on one end face of the base 2, one ends of the radiation electrodes 41 and 42 and one ends of the feed electrodes 43 and 44 are formed via gaps g9 and g10, respectively, and the other ends are connected to the coupling electrode 8 together on the same end face. Have been. Further, the radiation electrode 4
1 is formed slightly longer than the radiation electrode 42. In addition,
Reference numeral 45 denotes a fixed electrode, which is connected to the radiation electrodes 41 and 42 at one end face, and is soldered to an electrode on the substrate when the surface mount antenna 40 is mounted on the substrate.
【００２５】図８においては、放射電極４１および４２
が他方主面と互いに対向する２つの端面にわたって形成
され、その一端と給電電極４３および４４が１つの端面
に形成されている点のみが図７の実施例とは異なるが、
等価回路的には同等であり、図７の実施例と同じように
機能し、同様の作用・効果を示す。In FIG. 8, the radiation electrodes 41 and 42
Is different from the embodiment of FIG. 7 only in that the first main surface is formed over two end surfaces facing each other and the one end and the power supply electrodes 43 and 44 are formed on one end surface.
It is equivalent in terms of an equivalent circuit, functions in the same manner as the embodiment of FIG. 7, and shows the same operation and effect.
【００２６】本発明の表面実装型アンテナのさらに別の
実施例を図９に示す。図９で、図７と同一もしくは同等
の部分には同じ記号を付し、その説明は省略する。図９
に示した表面実装型アンテナ５０において、ストリップ
状の２つの放射電極５１および５２は基体２の１つの端
面から他方主面にかけてコ字状に形成され、その一端は
１つの端面において開放端を形成し、他端は同じ端面に
おいてグランド電極３１および３２に接続されている。
また、放射電極５１および５２の開放端の形成された端
面において、放射電極５１および５２の開放端に、それ
ぞれギャップｇ１３およびｇ１４を介してグランド電極
５３および５４が形成されている。さらに、同じ放射電
極５１および５２の一端に、ギャップｇ１１およびｇ１
２を介して隣接して、２つの給電電極５５および５６の
一端が形成され、その他端は隣接する端面においてとも
に結合電極８に接続されている。さらに、放射電極５１
は放射電極５２より少し長く形成されている。FIG. 9 shows still another embodiment of the surface mount antenna according to the present invention. In FIG. 9, the same or equivalent parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
In the surface-mounted antenna 50 shown in FIG. 2, the two strip-shaped radiation electrodes 51 and 52 are formed in a U-shape from one end face of the base 2 to the other main face, and one end thereof forms an open end on one end face. The other end is connected to the ground electrodes 31 and 32 on the same end surface.
On the end surfaces of the radiation electrodes 51 and 52 where the open ends are formed, ground electrodes 53 and 54 are formed at the open ends of the radiation electrodes 51 and 52 via gaps g13 and g14, respectively. Further, gaps g11 and g1 are provided at one end of the same radiation electrodes 51 and 52, respectively.
One end of each of the two power supply electrodes 55 and 56 is formed adjacent to each other via the second electrode 2, and the other end is connected to the coupling electrode 8 at an adjacent end face. Further, the radiation electrode 51
Are formed slightly longer than the radiation electrode 52.
【００２７】図９においては、放射電極５１および５２
が他方主面と１つの端面にわたって形成され、その開放
端にギャップｇ１３およびｇ１４を介してグランド電極
５３および５４が形成され、給電電極５５および５６が
放射電極５１および５２の一端にそれぞれ隣接して形成
されている点が図７の実施例とは異なる。等価回路的に
は給電電極５５および５６と放射電極５１および５２と
の容量が図２のｃ３およびＣ４に相当し、放射電極５１
および５２の開放端とグランド電極５３および５４との
間の容量が図２の等価回路に付加される形になるが、こ
れは放射電極５１および５２の開放端とグランド電極３
１および３２との間の容量であるコンデンサＣ１および
Ｃ２に対して並列に入るために、コンデンサＣ１および
Ｃ２に吸収してまとめることができ、最終的に図２の等
価回路と同じにすることができる。したがって図７の実
施例と同じように機能し、同様の作用・効果を示す。In FIG. 9, radiation electrodes 51 and 52 are shown.
Is formed over the other main surface and one end surface, ground electrodes 53 and 54 are formed at the open ends via gaps g13 and g14, and feed electrodes 55 and 56 are adjacent to one ends of radiation electrodes 51 and 52, respectively. It differs from the embodiment of FIG. 7 in that it is formed. In terms of an equivalent circuit, the capacitance between the feed electrodes 55 and 56 and the radiation electrodes 51 and 52 corresponds to c3 and C4 in FIG.
2 and the capacitance between the open ends of the ground electrodes 53 and 54 are added to the equivalent circuit of FIG.
In order to enter in parallel with the capacitors C1 and C2, which have a capacity between 1 and 32, the capacitors can be absorbed and combined into the capacitors C1 and C2, and finally the same as the equivalent circuit of FIG. it can. Therefore, it functions in the same manner as the embodiment of FIG. 7 and shows the same operation and effect.
【００２８】なお、上記の各実施例においては、一方の
放射電極の長さを他方の放射電極の長さより長く形成す
るとしたが、これは逆でも良い。また、放射電極の数を
２つとしたが、これは２つに限るものではなく、３つ以
上の放射電極を設けても良い。また、２つの放射電極の
長さが少し異なるとしたが、２つの共振回路の共振周波
数が異なるようになるものであれば、放射電極と給電電
極とのギャップの大きさが異なるなどの別の形状の違い
でも構わない。また、放射電極としてミアンダ状やコ字
状のものを採用したが、これは直線状やＬ字状などの別
の形状で構成しても同等の作用・効果を得ることができ
る。さらに、基体を構成する絶縁体として誘電体を用い
たが、これは磁性体を用いても良い。In each of the above embodiments, the length of one radiating electrode is formed longer than the length of the other radiating electrode, but this may be reversed. Further, although the number of the radiation electrodes is two, the number is not limited to two, and three or more radiation electrodes may be provided. Also, it is assumed that the lengths of the two radiating electrodes are slightly different. However, if the resonance frequencies of the two resonance circuits are different from each other, the length of the gap between the radiating electrode and the feeding electrode is different. The shape may be different. Although the meandering or U-shaped radiating electrode is employed, the same operation and effect can be obtained even if the radiating electrode is formed in another shape such as a linear shape or an L-shaped shape. Further, although a dielectric is used as an insulator constituting the base, a magnetic material may be used.
【００２９】図１０に、本発明の通信機の一実施例を示
す。図１０において、通信機６０は筐体６１の中に実装
基板６２が設けられ、実装基板６２にはグランド電極６
３および給電電極６４が形成されている。実装基板６２
の端部には本発明の表面実装型アンテナ１が搭載されて
いる。表面実装型アンテナ１の結合電極とグランド電極
（図示せず）は実装基板６２の給電電極６４とグランド
電極６３にそれぞれ接続されている。さらに、給電電極
６４は実装基板６２上に形成された切換回路６５を介し
て、同じく実装基板６２上に形成された送信回路６６お
よび受信回路６７に接続されている。FIG. 10 shows an embodiment of the communication device of the present invention. In FIG. 10, a communication device 60 includes a mounting board 62 provided in a housing 61, and the mounting board 62 has a ground electrode 6.
3 and a power supply electrode 64 are formed. Mounting board 62
The surface mount antenna 1 of the present invention is mounted on the end of the antenna. The coupling electrode and the ground electrode (not shown) of the surface mount antenna 1 are connected to the feed electrode 64 and the ground electrode 63 of the mounting board 62, respectively. Further, the power supply electrode 64 is connected to a transmission circuit 66 and a reception circuit 67 similarly formed on the mounting board 62 via a switching circuit 65 formed on the mounting board 62.
【００３０】このように、本発明の表面実装型アンテナ
１を実装基板６２の端部に搭載することにより、２つの
アンテナ機能を１つのアンテナで実現して通信機６０の
小型化とコストダウンを図ることができる。また、同時
に通信機６０の周波数帯域を広げるなどの特性の改善を
図ることができる。As described above, by mounting the surface mount antenna 1 of the present invention at the end of the mounting board 62, two antenna functions are realized by one antenna, and the size and cost of the communication device 60 can be reduced. Can be planned. At the same time, it is possible to improve characteristics such as broadening the frequency band of the communication device 60.
【００３１】なお、図１０の実施例においては表面実装
型アンテナ１を搭載して通信機６０を構成したが、図５
ないし図９に示した表面実装型アンテナ１０、２０、３
０、４０または５０を搭載し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. 10, the communication device 60 is configured by mounting the surface mount antenna 1;
To the surface mount antennas 10, 20, 3 shown in FIG.
Even if a communication device is configured by mounting 0, 40 or 50, the same operation and effect can be obtained.
【００３２】[0032]
【発明の効果】本発明の表面実装型アンテナによれば、
放射電極の開放端に、それぞれギャップを介して複数の
給電電極の一端を形成し、その複数の給電電極の他端を
１つにまとめて結合電極に接続することにより、小型
で、複数の周波数で利用可能なアンテナを形成したり、
周波数帯域の足し合わせによる広帯域のアンテナを形成
することができる。また、放射電極のレイアウトの自由
度が高くなり、放射電極間の相互干渉を小さくすること
ができる。さらにはアンテナの小形化と実装コストの低
減も可能となる。According to the surface mount antenna of the present invention,
At the open end of the radiation electrode, one end of each of a plurality of power supply electrodes is formed with a gap therebetween, and the other ends of the plurality of power supply electrodes are collectively connected to a coupling electrode, thereby achieving a small size and a plurality of frequencies. To form an antenna that can be used with
A broadband antenna can be formed by adding frequency bands. Further, the degree of freedom of the layout of the radiation electrodes is increased, and mutual interference between the radiation electrodes can be reduced. Further, the antenna can be downsized and the mounting cost can be reduced.
【００３３】また、本発明の通信機によれば、本発明の
表面実装型アンテナを搭載して構成することにより、小
型化とコストダウン、および特性の改善を図ることがで
きる。Further, according to the communication device of the present invention, by mounting and configuring the surface mount antenna of the present invention, it is possible to reduce the size, reduce the cost, and improve the characteristics.
【図１】本発明の表面実装型アンテナの一実施例を示す
透視斜視図である。FIG. 1 is a perspective view showing an embodiment of a surface mount antenna according to the present invention.
【図２】図１の表面実装型アンテナ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 surface mount antenna of FIG.
【図３】図１の表面実装型アンテナの反射特性を示す図
である。FIG. 3 is a diagram showing reflection characteristics of the surface-mount antenna of FIG. 1;
【図４】図１の表面実装型アンテナの反射特性を示す別
の図である。FIG. 4 is another diagram showing the reflection characteristics of the surface mount antenna of FIG. 1;
【図５】本発明の表面実装型アンテナの別の実施例を示
す透視斜視図である。FIG. 5 is a perspective view showing another embodiment of the surface mount antenna according to the present invention.
【図６】本発明の表面実装型アンテナのさらに別の実施
例を示す透視斜視図である。FIG. 6 is a perspective view showing still another embodiment of the surface mount antenna according to the present invention.
【図７】本発明の表面実装型アンテナのさらに別の実施
例を示す透視斜視図である。FIG. 7 is a perspective view showing still another embodiment of the surface mount antenna according to the present invention.
【図８】本発明の表面実装型アンテナのさらに別の実施
例を示す透視斜視図である。FIG. 8 is a perspective view showing still another embodiment of the surface mount antenna according to the present invention.
【図９】本発明の表面実装型アンテナのさらに別の実施
例を示す透視斜視図である。FIG. 9 is a perspective view showing still another embodiment of the surface mount antenna according to the present invention.
【図１０】本発明の通信機の一実施例を示す斜視図であ
る。FIG. 10 is a perspective view showing an embodiment of the communication device of the present invention.
１、１０、２０、３０、４０、５０…表面実装型アンテ
ナ ２…基体 ３、３１、３２…グランド電極 ４、５、１１、１２、２１、２２、３３、３４、４１、
４２、５１、５２…放射電極 ６、７、１３、１４、２３、２４、３５、３６、４３、
４４、５５、５６…給電電極 ８…結合電極 ｇ１、ｇ２、ｇ３、ｇ４、ｇ５、ｇ６、ｇ７、ｇ８、ｇ
９、ｇ１０、ｇ１１、ｇ１２…ギャップ ６０…通信機1, 10, 20, 30, 40, 50: surface mount antenna 2: base 3, 31, 32: ground electrode 4, 5, 11, 12, 21, 22, 33, 34, 41,
42, 51, 52 ... radiation electrodes 6, 7, 13, 14, 23, 24, 35, 36, 43,
44, 55, 56: feeding electrode 8: coupling electrode g1, g2, g3, g4, g5, g6, g7, g8, g
9, g10, g11, g12 ... gap 60 ... communication equipment
Claims (5)
主面にグランド電極が形成され、前記基体の少なくとも
他方主面にストリップ状の複数の放射電極が形成された
表面実装型アンテナであって、 前記複数の放射電極の一端はそれぞれ前記基体の他方主
面あるいはいずれかの端面で開放端を形成し、他端はそ
れぞれ前記グランド電極と接続し、 前記複数の放射電極の一端に、それぞれギャップを介し
て複数の給電電極の一端を形成し、前記複数の給電電極
の他端は前記基体のいずれかの面に形成された結合電極
に接続されていることを特徴とする表面実装型アンテ
ナ。1. A surface-mounted antenna in which a ground electrode is formed on one main surface of a rectangular parallelepiped base made of an insulator, and a plurality of strip-shaped radiation electrodes are formed on at least the other main surface of the base. One end of each of the plurality of radiation electrodes forms an open end on the other main surface or any end surface of the base, and the other end is connected to the ground electrode, respectively. A surface-mounted antenna, wherein one end of a plurality of feed electrodes is formed via a gap, and the other end of the plurality of feed electrodes is connected to a coupling electrode formed on any surface of the base. .
主面と他方主面と４つの端面の少なくとも１つの面に、
複数のグランド電極と、ストリップ状の複数の放射電極
が形成された表面実装型アンテナであって、 前記複数の放射電極の一端はそれぞれ開放端を形成し、
他端は前記複数のグランド電極とそれぞれ接続し、 前記複数の放射電極の一端にそれぞれギャップを介して
複数の給電電極の一端を形成し、前記複数の給電電極の
他端は前記基体のいずれかの面に形成された結合電極に
接続されていることを特徴とする表面実装型アンテナ。2. A rectangular parallelepiped base made of an insulator, which is provided on at least one surface of one main surface, the other main surface, and four end surfaces.
A plurality of ground electrodes and a surface-mounted antenna on which a plurality of strip-shaped radiation electrodes are formed, wherein one ends of the plurality of radiation electrodes form open ends, respectively.
The other end is connected to each of the plurality of ground electrodes, one end of each of the plurality of feed electrodes is formed at one end of the plurality of radiation electrodes via a gap, and the other end of each of the plurality of feed electrodes is one of the bases. A surface-mounted antenna connected to a coupling electrode formed on a surface of the antenna.
れギャップを介して近接してグランド電極を形成したこ
とを特徴とする、請求項１または２に記載の表面実装型
アンテナ。3. The surface mount antenna according to claim 1, wherein a ground electrode is formed close to each of the open ends of the plurality of radiation electrodes via a gap.
数が異なることを特徴とする、請求項１ないし３のいず
れかに記載の表面実装型アンテナ。4. The surface mount antenna according to claim 1, wherein the plurality of radiation electrodes have different resonance frequencies from each other.
面実装型アンテナを搭載したことを特徴とする通信機。5. A communication device comprising the surface-mounted antenna according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10081335A JPH114113A (en) | 1997-04-18 | 1998-03-27 | Surface mount antenna and communication apparatus using the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9-101656 | 1997-04-18 | ||
| JP10165697 | 1997-04-18 | ||
| JP10081335A JPH114113A (en) | 1997-04-18 | 1998-03-27 | Surface mount antenna and communication apparatus using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH114113A true JPH114113A (en) | 1999-01-06 |
Family
ID=26422356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10081335A Pending JPH114113A (en) | 1997-04-18 | 1998-03-27 | Surface mount antenna and communication apparatus using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH114113A (en) |
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