JPH08222943A - Small sized antenna and transmitter-receiver using the antenna - Google Patents
Small sized antenna and transmitter-receiver using the antennaInfo
- Publication number
- JPH08222943A JPH08222943A JP7021789A JP2178995A JPH08222943A JP H08222943 A JPH08222943 A JP H08222943A JP 7021789 A JP7021789 A JP 7021789A JP 2178995 A JP2178995 A JP 2178995A JP H08222943 A JPH08222943 A JP H08222943A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- antenna
- capacitors
- excitation point
- ground
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アンテナ及びそのアン
テナを用いた送受信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna and a transmitter / receiver using the antenna.
【０００２】[0002]
【従来の技術】トランシーバー等の携帯用の通信機器に
は、通常、ホイップアンテナやそのホイップアンテナに
コイルを接続した短縮型のアンテナが使用されている。
また、近年では、移動電話機、警報装置、ガス監視装
置、交通量のセンサ等に小型のアンテナを用いることが
多くなっている。このような例として、例えば、論文
「腕時計型携帯無線機用小型アンテナの検討」（１９９
３年，電子情報通信学会春季大会，Ｂ−１０１）にも記
載され、図１０（ａ）に示すように、長方形の導体にス
リットを設け、略中心に共振させるためのコンデンサを
設け、そこから離れた箇所に励振点を設けているものが
知られている。その特性は図１０（ｂ）及び（ｃ）に示
すように、指向性が小さく、どの方向からの電波でも同
程度に受信でき、あるいは放射できるものである。2. Description of the Related Art A whip antenna or a shortened antenna in which a coil is connected to the whip antenna is usually used for a portable communication device such as a transceiver.
Further, in recent years, small antennas are often used for mobile phones, alarm devices, gas monitoring devices, traffic sensors, and the like. As an example of such a case, for example, a paper “Study of Small Antenna for Wristwatch-type Portable Radio Device” (199
3 years, IEICE Spring Conference, B-101). As shown in FIG. 10 (a), a rectangular conductor is provided with a slit, and a capacitor for resonating is provided substantially at the center. It is known that an excitation point is provided at a remote place. As shown in FIGS. 10B and 10C, the characteristic is that the directivity is small and radio waves from any direction can be received or radiated to the same degree.
【０００３】[0003]
【発明が解決しようとする課題】このような小型のアン
テナは、実際に使用する周波数の波長に比べかなり短い
ものが要求される。そこで「従来の技術」の欄でも述べ
たとおり、コイルを直列に装荷して短縮することや上記
論文にも記載されているように、導体を短くしておいて
共振させるためのコンデンサを用いているが、コイルを
直列に装荷すると、コイルの直径分太くなり小型化を行
うことができず、共振のためにコンデンサを用いると、
そのコンデンサを接続する位置によって位相が変化し、
使用する周波数によっては最適な励振を行うことができ
ない場合や、使用する周波数の帯域が減少し、通信の信
頼性が低下することもある。Such a small antenna is required to be considerably shorter than the wavelength of the frequency actually used. Therefore, as described in the "Prior art" section, loading a coil in series to shorten it, and as described in the above paper, use a capacitor to resonate while keeping the conductor short. However, if the coils are loaded in series, it will be thicker by the diameter of the coil and it will not be possible to reduce the size.If a capacitor is used for resonance,
The phase changes depending on the position where the capacitor is connected,
Depending on the frequency used, optimum excitation may not be performed, or the frequency band used may decrease, resulting in a decrease in communication reliability.
【０００４】本発明は、小型化に優れ、広帯域で、かつ
周波数と最適な励振点を容易に調整できるアンテナと、
そのアンテナを用いた送受信装置を提供することを目的
とする。The present invention is an antenna which is excellent in miniaturization, has a wide band, and can easily adjust the frequency and the optimum excitation point, and
It is an object of the present invention to provide a transmitting / receiving device using the antenna.
【０００５】[0005]
【課題を解決するための手段】本発明のアンテナは、図
１に示すように、一平面内に使用周波数の波長をλとし
た時の長さが０．４λ以下である導体Ｄ１と、その導体
Ｄ１に平行な地導体Ｄ２とを有し、その両端部において
導体Ｄ１と地導体Ｄ２とをコンデンサＣ１及びＣ２によ
って接続し、導体Ｄ１の略中央部に励振点Ｐ1、Ｐ2を設
けたことを特徴とする。As shown in FIG. 1, an antenna according to the present invention includes a conductor D1 having a length of 0.4λ or less when the wavelength of a used frequency is λ in one plane, and A ground conductor D2 parallel to the conductor D1 is provided, the conductor D1 and the ground conductor D2 are connected at both ends by capacitors C1 and C2, and excitation points P 1 and P 2 are provided at substantially the center of the conductor D1. It is characterized by
【０００６】この励振点は導体Ｄ１の長さをＬ１とする
と、導体Ｄ１の端部から０．３Ｌ１〜０．７Ｌ１の範囲
であることが好ましく、この範囲より外側ではアンテナ
の損失が大きい。When the length of the conductor D1 is L1, this excitation point is preferably in the range of 0.3L1 to 0.7L1 from the end of the conductor D1, and the antenna loss is large outside this range.
【０００７】また、上記アンテナを折り返して、図３に
示すように、一平面内に使用周波数の波長λとした時の
長さが０．４λ以下である導体Ｄ１と、その導体Ｄ１を
囲むように形成したコ字状の地導体Ｄ２とを有し、その
コ字状の先端部において、導体Ｄ１と地導体Ｄ２とをコ
ンデンサＣ１及びＣ２によって接続し、その他方の端部
において、導体Ｄ１の略端部近傍に励振点を設けたこと
ができる。Further, by folding back the antenna, as shown in FIG. 3, the conductor D1 having a length of 0.4λ or less when the wavelength λ of the operating frequency is set in one plane, and the conductor D1 are surrounded. And a ground conductor D2 having a U-shape formed at the end, and the conductor D1 and the ground conductor D2 are connected by capacitors C1 and C2 at the tip end of the U-shape, and the conductor D1 is connected at the other end. An excitation point may be provided near the end.
【０００８】この場合の励振点も、上記ストレートのア
ンテナと同様に導体Ｄ１の長さをＬ２とすると、コンデ
ンサＣ１、Ｃ２の接続されていない端部から０〜０．２
Ｌ２の範囲であることが好ましい。The excitation point in this case is also 0 to 0.2 from the end where the capacitors C1 and C2 are not connected, where the length of the conductor D1 is L2, as in the straight antenna.
It is preferably in the range of L2.
【０００９】また、コンデンサＣ１、Ｃ２にトリマコン
デンサを用いれば、個々のアンテナの物理的形状による
誤差を吸収して、最適な励振点とを調整でき好ましい。Further, it is preferable to use trimmer capacitors as the capacitors C1 and C2, because it is possible to adjust the optimum excitation point by absorbing the error due to the physical shape of each antenna.
【００１０】この前記ストレートのアンテナの、コンデ
ンサＣ１、Ｃ２の値と最適な励振点との関係は、次のよ
うにして求めることができる。まず、使用するアンテナ
の導体Ｄ１の長さを決め、コンデンサＣ１、Ｃ２を線路
の特性インピ−ダンスＺ0 で正規化した値と、その時に
共振が得られる励振点を測定し、これを図７に示すよう
にグラフ化しておく。このグラフは、実際には測定して
得られたものではなく、線路の特性インピ−ダンスをＺ
0と、線路の損失αを仮定して計算式から求めたもので
ある。計算式を次に示す。The relationship between the values of the capacitors C1 and C2 and the optimum excitation point of the straight antenna can be obtained as follows. First, the length of the conductor D1 of the antenna to be used is determined, the value obtained by normalizing the capacitors C1 and C2 by the characteristic impedance Z 0 of the line, and the excitation point at which resonance is obtained at that time are measured. Graph it as shown in. This graph is not actually obtained by measurement, but the characteristic impedance of the line is Z
It is obtained from the calculation formula assuming 0 and the line loss α. The calculation formula is shown below.
【００１１】[0011]
【式１】 (Z1・Z2)÷(Z1-Z2)=Z0・・・・・・・・・・・・・・・・・・・・・（１） ただし Z1=(X1+Z0tanhΓ(L1-Lf))÷(Z0+X1tanhΓ(L1-Lf)) ・・・・・・・・（２） Z2=(X2+Z0tanhΓLf)÷(Z0+X2tanhΓLf) ・・・・・・・・・・・・・（３） X1=1÷ωC1, X2=1÷ωC2・・・・・・・・・・・・・・・・・・・・（４） Γ=α+jβ, β=２π÷λ ・・・・・・・・・・・・・・・・・・・（５） このようにして求めたグラフを元に、図１に示す形状の
アンテナを作成し、コンデンサＣ１、Ｃ２の値を決定し
て、導体Ｄ１の位置とアンテナの入力インピ−ダンスを
測定すれば、図８に示すような関係を求めることがで
き、この時にインピ−ダンスの整合がとれる箇所（Ｒ／
Ｚ0＝１）を励振点とすれば、最も効率の高いアンテナ
が得られる。図８からわかるように整合のとれる箇所は
２箇所存在する。[Formula 1] (Z 1 · Z 2 ) ÷ (Z 1 -Z 2 ) = Z 0・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (1) where Z 1 = (X 1 + Z 0 tanh Γ (L 1 -L f )) ÷ (Z 0 + X 1 tanh Γ (L 1 -L f )) ・ ・ ・ ・ ・ ・ (2) Z 2 = (X 2 + Z 0 tanh ΓL f ) ÷ (Z 0 + X 2 tanh ΓL f ) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (3) X 1 = 1 ÷ ωC 1 , X 2 = 1 ÷ ωC 2 (4) Γ = α + jβ, β = 2π ÷ λ (5) ) Based on the graph thus obtained, an antenna having the shape shown in FIG. 1 is created, the values of the capacitors C1 and C2 are determined, and the position of the conductor D1 and the input impedance of the antenna are measured. The relationship as shown in FIG. 8 can be obtained, and at this time, the point (R /
If Z 0 = 1) is set as the excitation point, the antenna with the highest efficiency can be obtained. As can be seen from FIG. 8, there are two matching points.
【００１２】このようなアンテナは、具体的には、一般
に配線板用に使用される絶縁基板上に直線状の導体Ｄ１
と、それに平行な地導体Ｄ２を設け、その両端部におい
て、導体Ｄ１と地導体Ｄ２とをコンデンサＣ１及びＣ２
によって接続し、導体Ｄ１の略中央部に励振点を設けて
作成することができ、さらに詳しくは、印刷配線板用銅
張り積層板の導体として必要な箇所以外をエッチング除
去する、一般の配線板の製造法を用いることによって作
成することができる。このようにして作成したアンテナ
を送受信機の筺体の一平面と平行に取り付ければ、狭い
箇所へアンテナを取り付けることができ、機器の小型化
を行うことができる。Specifically, such an antenna includes a linear conductor D1 on an insulating substrate generally used for wiring boards.
And a ground conductor D2 parallel to the ground conductor D2 and the conductor D1 and the ground conductor D2 at both ends of the ground conductor D2 and the capacitors C1 and C2.
Can be formed by providing an excitation point at a substantially central portion of the conductor D1, and more specifically, a general wiring board in which a portion of the copper-clad laminate for a printed wiring board other than a portion required as a conductor is removed by etching. Can be prepared by using the manufacturing method of. By mounting the antenna thus created in parallel with a plane of the housing of the transceiver, the antenna can be mounted in a narrow space, and the device can be downsized.
【００１３】また、上記折り返したアンテナについても
同様に絶縁基板上に直線状の導体Ｄ１と、それに平行な
地導体Ｄ２を設け、その両端部において、導体Ｄ１と地
導体Ｄ２とをコンデンサＣ１及び２によって接続し、導
体Ｄ１の略中央部に励振点を設けたアンテナを送受信機
の筺体の一平面に貼り合わせることもできる。Also in the folded antenna, similarly, a linear conductor D1 and a ground conductor D2 parallel to the straight conductor are provided on the insulating substrate, and the conductor D1 and the ground conductor D2 are connected to the capacitors C1 and C2 at both ends thereof. It is also possible to attach an antenna having an excitation point provided at substantially the center of the conductor D1 to one surface of the housing of the transmitter / receiver.
【００１４】また、これらのアンテナは送受信機の筺体
の一平面と平行に取り付け、筺体によってカバーするこ
ともでき、アンテナを絶縁保護することができ好まし
い。Further, these antennas can be mounted in parallel with one plane of the housing of the transceiver and can be covered with the housing, and the antenna can be insulated and protected, which is preferable.
【００１５】この他にも、通常のアンテナと同様にアン
テナ用コネクタに直接取り付けることもでき、また、別
の箇所に設置したアンテナとケーブルを用いて接続する
ことも可能である。In addition to the above, the antenna can be directly attached to the antenna connector like an ordinary antenna, or can be connected to an antenna installed at another location using a cable.
【００１６】[0016]
【作用】本発明者は、鋭意検討の結果、以下ような知見
を得て本発明をなしたものである。すなわち、短縮アン
テナを作成するにあたって、短縮した時の線路でも共振
が得られるようにコンデンサをアンテナの先端２箇所に
設け、図９に示すような励振点（Ｘ＝０）を中心とする
線対称アンテナを作成し、その電界分布を測定した。そ
の結果、このアンテナがある周波数で共振し、かつ整合
がとれた時は同図に示すように、電界の相対レベルが最
も低くなる箇所は励振点からそれた箇所にあること、及
び両端のコンデンサ容量は同図の左側の方が大きいこと
がわかった。このことから、 （１）共振時の電界分布は、図９の電界の相対レベルが
最も低くなる箇所は電界が０で、両端部（コンデンサが
附加されている位置）が最大である。 （２）両端の電界の強さはコンデンサ容量によって異な
り、容量が大きいほど電界は小さくなる。 （３）コンデンサ容量が大きいほどアンテナを短縮する
ことができる。 （４）電界０の位置を堺に左右で電界の位相が反転す
る。 （５）よって、このアンテナの指向性は８の字特性とな
る。 （６）電界０の位置のインピ−ダンス（純抵抗値）は０
で、両端に近づくに従って大きくなる。 （７）従って、整合のとれる励振点は電界０の位置を挟
んで２箇所存在する。 （８）電界０の位置をアンテナの中央に位置させ、左右
の電界分布（絶対値）を対称にするには両コンデンサの
値を等しくすればよい。 （９）ただし、この場合の励振点は中央からずれた位置
となる。中央を挟んで２箇所あるのでどちからを選べば
よい。 （10）この場合、アンテナを中央から折り返せば（図
３）位相はどの箇所でも同相となるため、指向性はほぼ
無指向性にすることができる。 等々の結論が得られた。The present inventor has accomplished the present invention by earning the following knowledge as a result of extensive studies. That is, when creating a shortened antenna, capacitors are provided at the two tips of the antenna so that resonance can be obtained even in the shortened line, and line symmetry about the excitation point (X = 0) as shown in FIG. 9 is the center. An antenna was created and its electric field distribution was measured. As a result, when this antenna resonates at a certain frequency and is matched, as shown in the figure, the location where the relative level of the electric field is the lowest is located away from the excitation point and the capacitors at both ends. It was found that the capacity was larger on the left side of the figure. From this, (1) the electric field distribution at the time of resonance is such that the electric field is 0 at the portion where the relative level of the electric field in FIG. 9 is the lowest, and the both ends (positions where capacitors are added) are maximum. (2) The strength of the electric field at both ends depends on the capacity of the capacitor, and the larger the capacity, the smaller the electric field. (3) The antenna can be shortened as the capacitor capacity increases. (4) The phase of the electric field is reversed left and right with the position of the electric field 0 as Sakai. (5) Therefore, the directivity of this antenna has an 8-shaped characteristic. (6) Impedance (pure resistance value) at the position of 0 electric field is 0
And it gets bigger as it gets closer to both ends. (7) Therefore, there are two matching excitation points with the electric field 0 interposed therebetween. (8) To position the position of the electric field 0 at the center of the antenna and make the left and right electric field distributions (absolute values) symmetrical, the values of both capacitors should be equal. (9) However, the excitation point in this case is a position deviated from the center. Since there are two places across the center, you can choose which one. (10) In this case, if the antenna is folded back from the center (FIG. 3), the phase will be the same at any place, so the directivity can be made almost omnidirectional. And so on.
【００１７】[0017]
実施例１ 図１に示すように、ガラス布／テトラフルオロエチレン
樹脂を用いた片面銅張り積層板の銅箔の不要な箇所を、
通常の配線板の製造に用いる方法でエッチング除去し、
使用周波数を４００ＭＨｚ、波長を７５０ｍｍとした時
の長さＬ１が約１００ｍｍである導体Ｄ１と、その導体
Ｄ１に平行な地導体Ｄ２とをトリマコンデンサＣ１及び
Ｃ２によって接続し、導体Ｄ１の略中央部に励振点を設
けたアンテナを作成した。この時の励振点は、図に示す
ように、導体Ｄ１の端部から略中央の４８ｍｍであっ
た。このアンテナの特性を図２に示す。導体Ｄ１の略中
央部を励振点として整合をとるべくトリマコンデンサＣ
１及びＣ２を調整したため、電界０の位置が導体Ｄ１の
中央部から大きくずれており、同図の特性は左右非対称
となっている。あらかじめ励振点を導体Ｄ１の中央部か
らずらせておき、電界０の位置が導体Ｄ１の略中央部に
位置するようにトリマコンデンサＣ１、Ｃ２を調整すれ
ば、同図の特性は左右対称の８の字とすることができ
る。Example 1 As shown in FIG. 1, unnecessary portions of a copper foil of a one-sided copper-clad laminate using a glass cloth / tetrafluoroethylene resin were
Etching-removed by the method used to manufacture ordinary wiring boards,
A conductor D1 having a length L1 of about 100 mm when the operating frequency is 400 MHz and a wavelength of 750 mm and a ground conductor D2 parallel to the conductor D1 are connected by trimmer capacitors C1 and C2, and a substantially central portion of the conductor D1 is connected. An antenna with an excitation point was created. The excitation point at this time was 48 mm approximately in the center from the end of the conductor D1, as shown in the figure. The characteristics of this antenna are shown in FIG. The trimmer capacitor C is used for matching with the substantially central portion of the conductor D1 as an excitation point.
Since 1 and C2 are adjusted, the position of the electric field 0 is largely deviated from the central portion of the conductor D1, and the characteristics of FIG. If the excitation point is shifted in advance from the central portion of the conductor D1 and the trimmer capacitors C1 and C2 are adjusted so that the position of the electric field 0 is located substantially in the central portion of the conductor D1, the characteristic of FIG. It can be written.
【００１８】実施例２ 図３に示すように、ガラス布／テトラフルオロエチレン
樹脂を用いた片面銅張り積層板の銅箔の不要な箇所を、
通常の配線板の製造に用いる方法でエッチング除去し、
使用周波数を４００ＭＨｚ、波長を７５０ｍｍとした時
の長さＬ２が５０ｍｍである導体Ｄ１と、その導体Ｄ１
を囲むように形成したコ字状の地導体Ｄ２とを有し、そ
のコ字状の先端部において、導体Ｄ１と地導体Ｄ２とを
コンデンサＣ１及びＣ２によって接続し、その他方の端
部において、導体Ｄ１の略端部近傍に励振点を設けたア
ンテナを作成した。この時の励振点は、図に示すよう
に、導体Ｄ１の端部からＬ１は５ｍｍであった。このア
ンテナの特性を図４に示す。Example 2 As shown in FIG. 3, unnecessary portions of the copper foil of the one-sided copper-clad laminate using glass cloth / tetrafluoroethylene resin were removed.
Etching-removed by the method used to manufacture ordinary wiring boards,
A conductor D1 having a length L2 of 50 mm when a frequency used is 400 MHz and a wavelength is 750 mm, and the conductor D1
And a ground conductor D2 having a U-shape formed so as to surround C, and the conductor D1 and the ground conductor D2 are connected by capacitors C1 and C2 at the tip of the U-shape, and at the other end, An antenna having an excitation point near the end of the conductor D1 was produced. The excitation point at this time was, as shown in the figure, L1 was 5 mm from the end of the conductor D1. The characteristics of this antenna are shown in FIG.
【００１９】実施例３ 図５に示すように、実施例１で作成したアンテナを送受
信機の筺体の一平面と平行に取り付けた送受信装置を作
成した。この送受信機の周波数は４００ＭＨｚ帯、出力
約１０ｄＢｍの特定小電力無線設備である。Example 3 As shown in FIG. 5, a transmitter / receiver was prepared in which the antenna prepared in Example 1 was attached in parallel with one plane of the housing of the transceiver. The frequency of this transceiver is 400 MHz band, and it is a specific low power radio equipment with an output of about 10 dBm.
【００２０】実施例４ 図６に示すように、実施例２で作成したアンテナを送受
信機の筺体の一平面に貼り合わせた送受信装置を作成し
た。この送信受信機も実施例３と同様に周波数４００Ｍ
Ｈｚ帯、出力約１０ｄＢｍの特定小電力無線設備であ
る。Example 4 As shown in FIG. 6, a transmitting / receiving device was prepared by attaching the antenna prepared in Example 2 to one plane of the housing of the transceiver. This transmitter / receiver also has a frequency of 400M as in the third embodiment.
It is a specific low-power radio equipment with a Hz band and an output of about 10 dBm.
【００２１】[0021]
【発明の効果】以上に説明したように、本発明によっ
て、小型化に優れ、かつ周波数と最適な励振点を容易に
調整できるアンテナと、そのアンテナを用いた送受信装
置を提供することができる。As described above, according to the present invention, it is possible to provide an antenna which is excellent in downsizing and which can easily adjust a frequency and an optimum excitation point, and a transmitting / receiving apparatus using the antenna.
【図１】本発明の一実施例を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of the present invention.
【図２】本発明の一実施例の特性を示す線図である。FIG. 2 is a diagram showing characteristics of an example of the present invention.
【図３】本発明の他の実施例を示す斜視図である。FIG. 3 is a perspective view showing another embodiment of the present invention.
【図４】本発明の他の実施例の特性を示す線図である。FIG. 4 is a diagram showing characteristics of another embodiment of the present invention.
【図５】本発明の一実施例の一態用を示す斜視図であ
る。FIG. 5 is a perspective view showing an embodiment of the present invention.
【図６】本発明の他の実施例の一態用を示す斜視図であ
る。FIG. 6 is a perspective view showing another embodiment of the present invention.
【図７】本発明の一実施例に用いたコンデンサの値と最
適な励振点の関係を示す線図である。FIG. 7 is a diagram showing a relationship between a value of a capacitor used in an example of the present invention and an optimum excitation point.
【図８】本発明の一実施例に用いた励振点と入力インピ
−ダンスの関係を示す線図である。FIG. 8 is a diagram showing a relationship between an excitation point and an input impedance used in one example of the present invention.
【図９】本発明の原理を説明するためのアンテナと、そ
の位置と電界分布を説明するための線図である。FIG. 9 is a diagram for explaining an antenna for explaining the principle of the present invention and a position and electric field distribution thereof.
【図１０】（ａ）は従来例を説明するための斜視図であ
り、（ｂ）及び（ｃ）は従来例のアンテナの特性を説明
するための線図である。10A is a perspective view for explaining a conventional example, and FIGS. 10B and 10C are diagrams for explaining characteristics of an antenna of a conventional example.
Claims (9)
の長さが０．４λ以下である導体Ｄ１と、その導体Ｄ１
に平行な地導体Ｄ２とを有し、その両端部において、導
体Ｄ１と地導体Ｄ２とをコンデンサＣ１及びＣ２によっ
て接続し、導体Ｄ１の略中央部に励振点を用いたことを
特徴とするアンテナ。1. A conductor D1 having a length of 0.4λ or less, where λ is a wavelength of a used frequency in one plane, and the conductor D1.
An antenna having a ground conductor D2 parallel to the conductor D2, the conductor D1 and the ground conductor D2 being connected at both ends thereof by capacitors C1 and C2, and an excitation point being used at substantially the center of the conductor D1. .
導体Ｄ１の端部から０．３Ｌ１〜０．７Ｌ１の範囲であ
ることを特徴とする請求項１に記載のアンテナ。2. The antenna according to claim 1, wherein an excitation point is within a range of 0.3L1 to 0.7L1 from an end portion of the conductor D1, where L1 is a length of the conductor D1.
の長さが０．４λ以下である導体Ｄ１と、その導体Ｄ１
を囲むように形成したコ字状の地導体Ｄ２とを有し、そ
のコ字状の先端部において導体Ｄ１と地導体Ｄ２とをコ
ンデンサＣ１及びＣ２によって接続し、その他方の端部
において、導体Ｄ１の略端部近傍に励振点を設けたこと
を特徴とするアンテナ。3. A conductor D1 having a length of 0.4λ or less, where λ is a wavelength of a used frequency in one plane, and the conductor D1.
And a ground conductor D2 having a U-shape formed so as to surround the conductor, the conductor D1 and the ground conductor D2 are connected by capacitors C1 and C2 at the tip of the U-shape, and the conductor is connected at the other end. An antenna characterized in that an excitation point is provided in the vicinity of substantially the end of D1.
点がコンデンサＣ１、Ｃ２の接続されていない端部から
０〜０．２Ｌ２の範囲であることを特徴とする請求項３
に記載のアンテナ。4. The conductor D1 has a length L2, and its excitation point is in the range of 0 to 0.2 L2 from the ends where the capacitors C1 and C2 are not connected.
Antenna described in.
サであることを特徴とする請求項１〜４のうちいずれか
に記載のアンテナ。5. The antenna according to claim 1, wherein the capacitors C1 and C2 are trimmer capacitors.
平行な地導体Ｄ２を設け、その両端部において、導体Ｄ
１と地導体Ｄ２とをコンデンサＣ１及びＣ２によって接
続し、導体Ｄ１の略中央部に励振点を設けたアンテナを
送受信機の筺体の一平面と平行に取り付けたことを特徴
とする送受信装置。6. A linear conductor D1 and a ground conductor D2 parallel to the straight conductor D1 are provided on an insulating substrate, and the conductor D is provided at both ends thereof.
1. A transmission / reception apparatus, characterized in that an antenna having an excitation point provided at a substantially central portion of the conductor D1 is connected in parallel with one plane of a housing of a transceiver, by connecting 1 and a ground conductor D2 by capacitors C1 and C2.
平行な地導体Ｄ２を設け、その両端部において、導体Ｄ
１と地導体Ｄ２とをコンデンサＣ１及びＣ２によって接
続し、導体Ｄ１の略中央部に励振点を設けたアンテナを
送受信機の筺体の一平面に貼り合わせたことを特徴とす
る送受信装置。7. A linear conductor D1 and a ground conductor D2 parallel to the straight conductor D1 are provided on an insulating substrate, and the conductor D is provided at both ends thereof.
1. A transmission / reception device characterized in that 1 and a ground conductor D2 are connected by capacitors C1 and C2, and an antenna having an excitation point provided at a substantially central portion of the conductor D1 is bonded to one plane of a housing of a transceiver.
体Ｄ１を囲むように形成したコ字状の地導体Ｄ２とを有
し、その一方の端部において、導体Ｄ１と地導体Ｄ２と
をコンデンサＣ１及びＣ２によって接続し、その他方の
端部において、導体Ｄ１の略端部近傍に励振点を設けた
アンテナを送受信機の筺体の一平面と平行に取り付けた
ことを特徴とする送受信装置。8. A linear conductor D1 and a U-shaped ground conductor D2 formed so as to surround the conductor D1 on an insulating substrate, and the conductor D1 and the ground conductor D2 are provided at one end thereof. Is connected by capacitors C1 and C2, and at the other end, an antenna having an excitation point near the end of the conductor D1 is attached in parallel with one plane of the housing of the transceiver. apparatus.
体Ｄ１を囲むように形成したコ字状の地導体Ｄ２とを有
し、その一方の端部において、導体Ｄ１と地導体Ｄ２と
をコンデンサＣ１及びＣ２によって接続し、その他方の
端部において、導体Ｄ１の略端部近傍に励振点を設けた
アンテナを送受信機の筺体の一平面に貼り合わせたこと
を特徴とする送受信装置。9. A linear conductor D1 and a U-shaped ground conductor D2 formed so as to surround the conductor D1 on an insulating substrate, and the conductor D1 and the ground conductor D2 are provided at one end thereof. Is connected by capacitors C1 and C2, and at the other end, an antenna having an excitation point near the end of the conductor D1 is attached to one plane of the housing of the transceiver. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021789A JPH08222943A (en) | 1995-02-09 | 1995-02-09 | Small sized antenna and transmitter-receiver using the antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021789A JPH08222943A (en) | 1995-02-09 | 1995-02-09 | Small sized antenna and transmitter-receiver using the antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08222943A true JPH08222943A (en) | 1996-08-30 |
Family
ID=12064837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7021789A Pending JPH08222943A (en) | 1995-02-09 | 1995-02-09 | Small sized antenna and transmitter-receiver using the antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08222943A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012142706A (en) * | 2010-12-28 | 2012-07-26 | Tdk Corp | Radio communication antenna and radio communication device |
| WO2013011703A1 (en) * | 2011-07-20 | 2013-01-24 | 株式会社フジクラ | Antenna and wireless tag |
-
1995
- 1995-02-09 JP JP7021789A patent/JPH08222943A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012142706A (en) * | 2010-12-28 | 2012-07-26 | Tdk Corp | Radio communication antenna and radio communication device |
| US9054428B2 (en) | 2010-12-28 | 2015-06-09 | Tdk Corporation | Antenna and wireless communication unit |
| WO2013011703A1 (en) * | 2011-07-20 | 2013-01-24 | 株式会社フジクラ | Antenna and wireless tag |
| WO2013012083A1 (en) * | 2011-07-20 | 2013-01-24 | 株式会社フジクラ | Antenna and wireless tag |
| CN103814478A (en) * | 2011-07-20 | 2014-05-21 | 株式会社藤仓 | Antenna and wireless tag |
| US8991716B2 (en) | 2011-07-20 | 2015-03-31 | Fujikura Ltd. | Antenna and wireless tag |
| CN103814478B (en) * | 2011-07-20 | 2016-02-24 | 株式会社藤仓 | Antenna and wireless identification tag |
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