JPS61125205A - Loaded antenna - Google Patents

Loaded antenna

Info

Publication number
JPS61125205A
JPS61125205A JP24681884A JP24681884A JPS61125205A JP S61125205 A JPS61125205 A JP S61125205A JP 24681884 A JP24681884 A JP 24681884A JP 24681884 A JP24681884 A JP 24681884A JP S61125205 A JPS61125205 A JP S61125205A
Authority
JP
Japan
Prior art keywords
antenna
line
capacitor
length
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP24681884A
Other languages
Japanese (ja)
Inventor
Susumu Nakabayashi
中林 進
Tokuyoshi Oba
大場 徳喜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANTENNA GIKEN KK
Toyo Communication Equipment Co Ltd
Original Assignee
ANTENNA GIKEN KK
Toyo Communication Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ANTENNA GIKEN KK, Toyo Communication Equipment Co Ltd filed Critical ANTENNA GIKEN KK
Priority to JP24681884A priority Critical patent/JPS61125205A/en
Publication of JPS61125205A publication Critical patent/JPS61125205A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/06Details
    • H01Q9/14Length of element or elements adjustable
    • H01Q9/145Length of element or elements adjustable by varying the electrical length

Landscapes

  • Details Of Aerials (AREA)

Abstract

PURPOSE:To decrease the antenna element length only with the addition of a simple circuit by connecting a capacitor having a required capacitance between a lower end of a negative pole element and an outer conductor of a coaxial feeder leading to a feeding part in parallel with said element. CONSTITUTION:In taking the length of the line as l1<lambda/4 for example, the impedance Zs in an inductance L ( reactance jX1). In connecting a capacitance C (-jX1) to the open end of the line, the impedance Zs' viewed from thecapacitor is expressed in equation I, where omega is an angular velocity. In selecting the capacitor so as to zero the denominator (1-omega<2>LC), the Z's is infi nite, causing the line to be resonated. For example, a positive pole and a nega tive pole elements 16, 17 having a length shorter than lambda/4 are connected respec tively to a center conductor 20 and an outer conductor 21 of a coaxial feeder 19 and a capacitor 22 is connected between the lower end of the negative pole element 17 and the outer condutor 21 of the coaxial line to constitute an h-type antenna.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は垂直ダイポール系アンテナ例えばスリーブ・
アンテナ又はh型アンテナのエレメント長を短縮したも
のに関する。
[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to vertical dipole antennas such as sleeve and
This relates to an antenna or an h-type antenna with a shortened element length.

〔従来の技術〕[Conventional technology]

従来、垂直ダイポール糸アンテナに使用する給電線とし
ては通常、特性インピーダンスが50図に示すように行
うのが一般的である。
Conventionally, a feed line used in a vertical dipole thread antenna has generally had a characteristic impedance as shown in Figure 50.

即ち、同軸ケーブル1の外被導体、所鯖シールド部2の
一端を前記アンテナの負極エレメント3に他端を無線通
信機4の筐体5に又この同軸ケーブル1の内導体6の一
端をアンテナの正極エレメント7にかつ他端を無線通信
機のホット端子8に夫々接続する。
That is, one end of the outer conductor of the coaxial cable 1, the shield part 2, is connected to the negative electrode element 3 of the antenna, the other end is connected to the housing 5 of the wireless communication device 4, and one end of the inner conductor 6 of this coaxial cable 1 is connected to the antenna. and the other end to the hot terminal 8 of the wireless communication device, respectively.

しかし、このように接続して垂直ダイポール・アンテナ
を使用すると、負極エレメント3と平行して垂下する前
記同軸給を線1の外被導体部2には、該アンテナから輻
射する電磁波(偏位II流)に誘起さねて^周波電流■
か流れ該郡全体に定在波(8tanding wave
 ) 9が生ずる。
However, when a vertical dipole antenna is connected in this manner, the coaxial feed hanging in parallel with the negative pole element 3 is exposed to the electromagnetic waves radiated from the antenna (deviation II Frequency current induced in the current
There are 8 standing waves throughout the county.
) 9 occurs.

この定在波の誘起状態はこれら通イハ機器の周囲環境、
例えば同軸給電線とアース(大地)との接触状態或はこ
れらアンテナ・エレメントに近接する導電体又は鋳電体
物實等の有無によって大きく変動する。また給電線に定
在波が存在するとアンテナ給電点に於けるアンテナ・エ
レメントとのインピーダンス整合が大きく乱れアンテナ
本来の特性を得られない。
The induced state of this standing wave is caused by the surrounding environment of these devices,
For example, it varies greatly depending on the state of contact between the coaxial feeder line and the ground, or the presence or absence of a conductor or cast material in the vicinity of these antenna elements. Furthermore, if standing waves exist in the feed line, the impedance matching with the antenna element at the antenna feed point will be greatly disturbed, making it impossible to obtain the original characteristics of the antenna.

即ち、アンテナエレメント谷部のインピーダンスは該部
に流れる高周波電流と電圧の比で表わさ才1、給電点に
於いて正極及び負極アンテナ・エレメントとこれに接続
された同軸給電線の内外導体とに流れる電流か等しい状
態にてはじめて両者の整合が得られるものであるから上
述の如(同軸給電線の外被導体のみに流れる電流が生す
るとこれによりアンテナ・エレメントに生ずべき正規の
電圧及び電流の定在波の分布状態が変形され、結果的に
給電点に於けるインピーダンス整合か乱れアンテナの利
得及び指向性パターンか悪化する。
In other words, the impedance of the antenna element valley is expressed as the ratio of the high-frequency current flowing through the valley to the voltage flowing through the positive and negative antenna elements and the inner and outer conductors of the coaxial feed line connected to them at the feeding point. Since matching between the two can only be achieved when the currents are equal, as mentioned above (if a current flows only through the outer conductor of the coaxial feed line, the normal voltage and current that should be generated in the antenna element) The distribution state of the standing wave is distorted, resulting in a disturbance in the impedance matching at the feed point and a deterioration in the gain and directivity pattern of the antenna.

この現象はアンテナから電磁波を輻射する時のみならず
受イハ時に於いても同様に生じ通信系全体の受信感度に
大幅な変動をきた1−0この不都合を除去するために従
来から第7図(al及び(b)に示すようなh型アンテ
ナ及びスリーブ・アンテナが用いられている。
This phenomenon occurs not only when radiating electromagnetic waves from the antenna, but also during reception, and causes a large fluctuation in the receiving sensitivity of the entire communication system.1-0 In order to eliminate this inconvenience, conventional methods have been used as shown in Fig. 7 ( H-type antennas and sleeve antennas as shown in al and (b) are used.

本発明の理解を助けるためにこれらのうち同図(blに
示した従来のスリーブ・アンテナの動作な歩セ→説明す
る。
To help understand the present invention, the operational steps of the conventional sleeve antenna shown in FIG.

同図(b)に於いて、10及び】1は夫々λ/4(λは
使用波長)長を有する正極及び負極アンテナ・エレメン
トであって該負極エレメント11はその内部に同軸給電
線12を責通せしめた中空パイプ構造とし給電部13に
於いて該同軸給電線12の内導体6と前記正極アンテナ
・エレメント10とを又その外導体2と前記負極アンテ
ナ・エレメント11とを夫々接続したものである。
In the figure (b), 10 and 1 are positive and negative antenna elements each having a length of λ/4 (λ is the wavelength used), and the negative element 11 has a coaxial feed line 12 inside it. The inner conductor 6 of the coaxial feed line 12 and the positive antenna element 10 are connected to the inner conductor 6 of the coaxial feed line 12, and the outer conductor 2 of the coaxial feed line 12 is connected to the negative antenna element 11 in the feed section 13. be.

斯かる構造力アンテナに於いて、前記負極アンテナ・エ
レメント11とこれの中心軸に位置する同軸給電線の外
被導体2とで新らたに構成される同軸状線路の下端開口
部からアンテナ給電部13側を晃込んだインピーダンス
ZINはλ/4長平行伝送路の終端を短絡したものとな
るから周知の通り極めて大きな値(理論的には無限大)
となる。
In such a structural force antenna, the antenna is fed from the lower end opening of the coaxial line newly constructed of the negative antenna element 11 and the outer sheath conductor 2 of the coaxial feed line located at the center axis of the negative antenna element 11. The impedance ZIN that impinges on the section 13 side is equivalent to short-circuiting the ends of the λ/4 long parallel transmission line, so as is well known, it has an extremely large value (theoretically infinite).
becomes.

従って、このような関係を維持する眠りこの高インピー
ダンスのためにアンテナ、特に負極エレメントから輻射
する電磁波に誘起されて同軸給!線外被導体に%流が流
れることがなく、前述のような定住波が生じないからア
ンテナと無線機とのインピーダンス整合が乱されること
がない。
Therefore, maintaining this relationship is induced by the electromagnetic waves radiated from the antenna, especially the negative pole element, due to this high impedance and the coaxial feed! Since no current flows into the conductor outside the line, and the above-mentioned fixed waves are not generated, impedance matching between the antenna and the radio equipment is not disturbed.

しかしながら、このような現象に基づいて安定に使用し
得るのはアンテナ・エレメント長がλ/4又はその近傍
の極めて狭い範囲に限られアンテナの適用周波数帯域と
して広くできない。
However, based on this phenomenon, stable use is limited to an extremely narrow range in which the antenna element length is λ/4 or its vicinity, and the frequency band to which the antenna can be applied cannot be widened.

又、同様の理由からホイップ・アンテナ或はブラウン・
アンテナ等に於いて用いられるように、短縮コイルを挿
入してエレメント&を短くした短縮アンテナの実現はこ
れらスリーブ型或はh型アンテナでは不可能であった。
Also, for the same reason, whip antenna or brown antenna
It has not been possible to realize a shortened antenna by inserting a shortening coil to shorten the element &, as used in antennas, etc., with these sleeve-type or h-type antennas.

即ち、従来のスリーブ型或はh型アンテナでは少な(と
も負極エレメントの長さがλ/4必要であり例えこれに
コイルを挿入してエレメント長を短縮しても負極エレメ
ントと平行する同軸給電線の外被導体にコイルを挿入し
てこの長さを短縮することは不可能であるから従前の原
理は適用できなかった。
In other words, with conventional sleeve-type or H-type antennas, the length of the negative pole element is required to be λ/4. Since it is impossible to shorten this length by inserting a coil into the jacketed conductor, the previous principle could not be applied.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述のように従来垂直偏波にて使用するダイポール系ア
ンテナでは、これに使用する同軸給電線の外被導体に不
要高周波電流を生じさせないための手段がλ/4長を有
する負極エレメントとこれと平行する同軸給IE#i!
の外被導体とで、一端を短絡した平行線路を構成するこ
とによって該平行線路の開口端、即ち前記負極エレメン
トの下端部から給電点側をみたインピーダンスを極めて
大きく(理論的に無限大)するものであったため、アン
テナエレメント長を知紬することが不iJ能であった。
As mentioned above, in conventional dipole antennas used in vertically polarized waves, the means to prevent unnecessary high frequency current from occurring in the outer conductor of the coaxial feed line used is a negative electrode element having a length of λ/4 and a negative electrode element having a length of λ/4. Parallel coaxial feed IE#i!
By configuring a parallel line with one end short-circuited with the jacket conductor, the impedance seen from the open end of the parallel line, that is, the lower end of the negative electrode element toward the feed point side, is made extremely large (theoretically infinite). Therefore, it was impossible to know the length of the antenna element.

L問題を解決するための手段] 本発明は上述したような従来のダイポール系アンデナの
諸問題に鑑みてなされたものであって、アンテナエレメ
ント長を知組せしめかつ従来のアンテナと凹環の利得を
得る手段として次の如き構成をとる。
Means for Solving the L Problem] The present invention has been made in view of the problems of the conventional dipole antenna as described above, and it has been made in view of the problems of the conventional dipole antenna as described above. As a means of obtaining this, the following configuration is adopted.

即ち、アンテナ・エレメントな用足の長さに短縮しかつ
この負極エレメントの下端部と、該エレメントに平行す
る前記同軸給電線の外被導体との間に後述する如くエレ
メントの短縮率に応じたPjr費の値のコンデンサを接
続する。又前記同軸給電線の−E述した部分が導体中空
パイプ等でおおわれた構造のものである場合は、前記コ
ンデンサを該中空パイプと前記負極エレメント下端部と
の間に接続することによって短縮されたアンテナ・エレ
メント長を電気的に補い従来のスリーブ・アンテナ又は
h型アンテナと同等の作用および特性を得るようにする
That is, the length of the antenna element is shortened to the length required for the antenna element, and a gap is formed between the lower end of the negative electrode element and the jacket conductor of the coaxial feed line parallel to the element according to the shortening rate of the element, as described later. Connect a capacitor with the value of Pjr. In addition, if the part mentioned in -E of the coaxial feeder line has a structure covered with a conductor hollow pipe, etc., the length can be shortened by connecting the capacitor between the hollow pipe and the lower end of the negative electrode element. The length of the antenna element is electrically compensated to obtain the same operation and characteristics as a conventional sleeve antenna or h-type antenna.

〔作用〕[Effect]

このように構成したアンテナの前記コンデンサの値の決
定方法及びその作用について以下旺細に説明する。
The method of determining the value of the capacitor of the antenna thus constructed and its operation will be described in detail below.

第8図に示すように、長さlくλ/4の31行線路14
.14’の一端を短絡したものは前述のニレメントラ短
縮したh型又はスリーブアンテナの負極エレメントとこ
れに平行する同軸給tSO外被導体とで新らたに構成さ
れる平行線路の等価回路とみなせる。
As shown in FIG. 8, a 31-row line 14 of length l and λ/4
.. The one with one end of 14' shorted can be regarded as an equivalent circuit of a parallel line newly constructed by the negative pole element of the above-mentioned shortened h-type or sleeve antenna and a coaxially fed tSO jacket conductor parallel to the negative pole element.

周知の如(、平行線路は分布定数回路となり線路の損失
が実質上無視し得る程度に小さいから、−万端を短絡し
たλ/4艮平行線路の他万端からみたインピーダンスZ
8は共振現象によって無限大となる。
As is well known (parallel line becomes a distributed constant circuit and line loss is so small that it can be virtually ignored), the impedance Z of the parallel line seen from the other end of the λ/4 wire with the two ends shorted is
8 becomes infinite due to the resonance phenomenon.

しかし、前記線路長がλ/4より短い場合には共振せず
ある有限のインピーダンスを程する。
However, if the line length is shorter than λ/4, no resonance occurs and a certain finite impedance is maintained.

このような回路を所望周波数において共振せしめるため
には第9図に示す如く線路の開放端にコンデンサCを接
続すJlばよい。
In order to make such a circuit resonate at a desired frequency, it is sufficient to connect a capacitor C to the open end of the line as shown in FIG.

以下この場合のコンデンサの値を算出する手順を数式を
用いて説明する。
The procedure for calculating the capacitor value in this case will be explained below using mathematical formulas.

一般に、第10図に示すように一端をインピーダンスz
RでP:端した平行線%15.15’の他端からみたイ
ンピーダンス2は次式で表わされる。
Generally, one end is connected to an impedance z as shown in Figure 10.
R and P: The impedance 2 seen from the other end of the parallel line %15.15' is expressed by the following equation.

Z=Zol(Za+jZotan# )/(Zo+jZ
Rtan#))(Ω]・・・1この式の終端インピーダ
ンスZRを零、即ち短絡すると前記インピーダンスZs
は Za = jZo ta++βl 〔Ω〕    ・・
・・・・・・・・・・・・・2となるから、線路長lと
Zaとの関係を図示すると第11図となる。
Z=Zol(Za+jZotan#)/(Zo+jZ
Rtan#))(Ω]...1 If the terminal impedance ZR in this equation is zero, that is, short-circuited, the impedance Zs
is Za = jZo ta++βl [Ω] ・・
. . . 2. Therefore, the relationship between the line length l and Za is shown in FIG. 11.

即ち、線路の長さlを零から増加するとこれに応じてイ
ンピーダンスZsはインダクタンス成分として序々に増
大しl−λ/4に於いて***振し誘4性インピーダンス
Zs−ωとなると同時に同一点にて容量性インピーダン
スZs −00K 転じ、更にlが増大すると28は漸
少し、l−λ/2にて零となる。
That is, when the line length l is increased from zero, the impedance Zs gradually increases as an inductance component, anti-resonates at l-λ/4, becomes the diquadratic impedance Zs-ω, and at the same time reaches the same point. The capacitive impedance Zs -00K changes, and as l further increases, 28 gradually decreases and becomes zero at l-λ/2.

このような変化は線路長lの増加とともにλ/2を周期
として繰返し生じる。
Such changes occur repeatedly at a period of λ/2 as the line length l increases.

ここで今前記線路の長さが1.<λ/4である場合を考
えると、同図中点線の如(このIvl!路の開放端から
みたインピーダンスz8はりブクタンスjX□を有する
インダクタイスLとなる。そこで第12図に示すように
線路の開放端に−jX+なるリアクタンスのキャパシタ
ンスCを接続すると、このコンデンサ両端からみたイン
ピーダンスZ++’はこれを伝搬する信号の角速度をω
としてZ’s = jωL/ (1−ω2LC)   
    ・−・・・−3となるから上式の右辺分母(l
−ω’LC)を零となる如くコンデンサの値をえらべば
Z’a=ωとなり、線路を共振させることができる。従
って、−万端を短絡したλ/4長線路と等価になる。
Now, the length of the line is 1. Considering the case where When a capacitance C with a reactance of -jX+ is connected to the open end of the
As Z's = jωL/ (1-ω2LC)
・−・・・−3, so the right-hand side denominator (l
-ω'LC) is set to zero, Z'a=ω, and the line can be made to resonate. Therefore, it is equivalent to a λ/4 long line with all ends shorted.

本発明はこのような原理に基づき、λ/4より短い負極
エレメントとこれに平行する同軸給電線の外被導体とで
構成する平行線路にコンデンザを付加して共振させるこ
とにより従来のスリーブ・アンテナ又はh型アンテナと
ほぼ同等の性能をもったアンテナを実現するものである
Based on this principle, the present invention adds a capacitor to a parallel line consisting of a negative electrode element shorter than λ/4 and a jacket conductor of a coaxial feeder line parallel to the negative electrode element to make it resonate. Alternatively, it is possible to realize an antenna having almost the same performance as an h-type antenna.

〔実施例) 以下、本発明を図ボした実施例に基づいて詳細に説明す
る。
[Example] Hereinafter, the present invention will be described in detail based on a simplified example.

第1図は本発明をh型アンテナに通用した場合の一実施
例を示す構造図である。
FIG. 1 is a structural diagram showing an embodiment in which the present invention is applied to an h-type antenna.

同図に於いて16及び17はλ/4より短かい正極及び
負極エレメントでル)って、これらを給電部1Bに於い
て同軸給電線19の中心導体20及び外被導体21と夫
々接続すると共に前記負極エレメント17の下端部と上
述した同軸給電線外被導体21との間にコンデンサ22
を接続してh型アンテナを構成する。
In the figure, 16 and 17 are positive and negative electrode elements shorter than λ/4, and these are connected to the center conductor 20 and outer conductor 21 of the coaxial feed line 19, respectively, in the feed section 1B. At the same time, a capacitor 22 is connected between the lower end of the negative electrode element 17 and the above-mentioned coaxial feed line outer conductor 21.
Connect them to form an h-type antenna.

この場合の上記コンデンサの値及び作用は前述のとおり
である。
The value and operation of the capacitor in this case are as described above.

第2図(al及び(b)は共に本発明の他の実施例を示
すものであって、同図ta)はh型アンテナの負極エレ
メントに平行して給電部に至る同軸給電線19が導体中
空パイプ23で葎われたものである場合の対応を示すも
のであり、この場合は前述のコンデンサ22を該導体中
空パイプ23と負極エレメント17の下端部との間に接
続すればよい。
FIG. 2 (al) and (b) both show other embodiments of the present invention, and FIG. 2 (ta) shows that the coaxial feed line 19 running parallel to the negative pole element of the H-type antenna and reaching the feed section is a conductor. This figure shows how to deal with the case where the hollow pipe 23 is used. In this case, the above-mentioned capacitor 22 may be connected between the conductor hollow pipe 23 and the lower end of the negative electrode element 17.

尚、このように負極ニレインド17とこれに平行する導
体中空パイプ23との間隔がスペーサ24等によって固
定されたものである場合には前記コンデンサ22に代え
て、同図(b)に示す如く、負極エレメント17の下端
部に前記導体中空パイプ23に向けて設けたネジ孔にビ
スを貫通せしめ、その先端面と前記導体中空パイプ23
の側面との間に静電容量を生ぜしめかつこの間隔を調整
することによって所望の容量を得るようにすれば、適用
周波数への調整が容易となり極めて便利である。
In this case, when the distance between the negative electrode nirain 17 and the conductor hollow pipe 23 parallel thereto is fixed by the spacer 24 or the like, instead of the capacitor 22, as shown in FIG. A screw is passed through a screw hole provided at the lower end of the negative electrode element 17 toward the conductor hollow pipe 23, and the tip surface and the conductor hollow pipe 23 are inserted into a screw hole.
If a desired capacitance is obtained by creating a capacitance with the side surface of the capacitor and adjusting this distance, adjustment to the applied frequency becomes easy and is extremely convenient.

又、本発明をスリーブ・アンテナに適用するにあたって
は、第3図に示す如く、前述のコンデンサを負極エレメ
ントとしての導体円筒25の下端部内壁とこの内部を貫
通する同軸給1!19の外被導体21との間に挿入接続
すればよい。
Furthermore, in applying the present invention to a sleeve antenna, as shown in FIG. What is necessary is just to insert and connect between it and the conductor 21.

尚、この場合の前記コンデンサとしては通常の円盤形磁
器コンデンサ或は積層セラミックコンデンサであっても
よいが、第4図に示す如く中間の誘電体26を挟んで円
筒電極27と28を対向せしめる如く構成したコンデン
サを負極エレメント25下端内壁と同軸給電線19との
間隙に嵌着したものであってもよく、このようにすれば
Uコンデンサが負極エレメントと給電線との支持機能を
合せもち構造上より強固なものとなろう。もちろんスリ
ーブ・アンテナに於いても前記第2図(b)と同様にネ
ジを用いた容量形成手段或はトリマコンデンサ等容量可
変なるものを用いて調整を容易ならしめる如くしてもよ
いことは明らかであろう。
In this case, the capacitor may be an ordinary disk-shaped ceramic capacitor or a multilayer ceramic capacitor, but as shown in FIG. The configured capacitor may be fitted into the gap between the inner wall of the lower end of the negative electrode element 25 and the coaxial feeder line 19. In this way, the U capacitor can have a supporting function for both the negative electrode element and the feeder line, and the structure is improved. Let's become stronger. Of course, it is obvious that the sleeve antenna may also be easily adjusted by using a capacitance forming means using a screw or a variable capacitance such as a trimmer capacitor as shown in FIG. 2(b). Will.

尚、以上の実施例ではいづれも正極エレメントの短縮を
補う手段については述べなかったが、この補完手段とし
ては周知の如く短縮コイルを挿入する方法或は給電部に
コイルとコンデンサとからなるπ型整合回路を介在せし
める方法等を用いればよい。しかしながら正極エレメン
トの短縮によってアンテナの性能を著しく損われない場
合は、あえてこねらの補完手段を講する必要はないであ
ろう。
In the above embodiments, we have not described any means for compensating for the shortening of the positive electrode element, but as well-known methods for compensating for this, there is a method of inserting a shortening coil, or a method of inserting a shortening coil in the power supply section, or a method of inserting a π type consisting of a coil and a capacitor in the power supply section. A method such as interposing a matching circuit may be used. However, if the shortening of the positive electrode element does not significantly impair the performance of the antenna, there is no need to take additional supplementary measures.

尚更に、本発明は上述の単−型アンテナのみならずこれ
らを放射器とする八木アンテナ等の多素子アンテナに応
用することもできる。
Furthermore, the present invention can be applied not only to the above-mentioned single-type antenna but also to multi-element antennas such as Yagi antennas using these antennas as radiators.

第5図は本発明を多素子アンテナに適用した場合の一実
施例を示すものであって、スリーブ・アンテナを放射器
として夫々のエレメント長を短縮した5素子八木アンテ
ナのスリーブ部分に上述と同様の手法によってその負極
エレメント下端内壁と給電線外被導体との間にコンデン
サを挿入すると共に他のエレメントに短縮コイルを挿入
して所望の周波数に共振せしめたものである。
FIG. 5 shows an embodiment in which the present invention is applied to a multi-element antenna, in which the sleeve antenna is used as a radiator and the length of each element is shortened. By this method, a capacitor is inserted between the inner wall of the lower end of the negative electrode element and the outer conductor of the power supply line, and a shortened coil is inserted in the other element to make it resonate at a desired frequency.

このようにすれば夫々のエレメントを短縮した多素子ア
ンテナを実現できる。
In this way, it is possible to realize a multi-element antenna in which each element is shortened.

〔発明の効果〕〔Effect of the invention〕

本発明は以上説明したように構成しかつ機能するもので
あるから、簡単な回路を付加するのみで、従来不可能で
あったエレメント長を短縮したスリーブ・アンテナ又は
h型アンテナ或はこれらを放射器とする多素子アンテナ
を実現1−るうえで極めて大きな効果を奏する。
Since the present invention is configured and functions as explained above, by simply adding a simple circuit, it is possible to create a sleeve antenna or an H-type antenna with a shortened element length, which was previously impossible, or to radiate these antennas. This has an extremely large effect in realizing a multi-element antenna as a device.

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

第1図は本発明に係かるh型アンテナの一実施例を示す
構成図、第2図は本発明の他の実施例を示す図であって
(a)はh型アンテナが変形された場合の本発明の実施
例を示す構造図及び(b)は本発明に用いるコンデンサ
形成手段の一実施例をボす構造図、第3図は本発明をス
リーブ・アンテナに通用する場合の構造図、第4図はス
リーブアンテナに本発明を適用する場合のコンデンサの
一実施例を示す構造図、第5図は本発明を適用した多素
子アンテナの一実施例な示す構造図、第6図は従来のダ
イポールアンテナを使用する場合の給を線に誘起する定
在波を説明する図、第7図(、)及び(b)は夫々従来
のh型アンテナ及びスリーブアンテナを示す構造図、第
8図、第9図、第10図、第11及び12図は夫々本発
明の詳細な説明する分布定数線路の模式図及びその特性
図である。 14及び14′・・・平行線路、16・・・正極アンテ
ナ・エレメント、17・・・負極アンテナ・エレメント
、18・・・給電部、19・・・同軸給′iiI線、2
0・・・同軸給電線の中心導体、21・・・同軸給電線
の外被導体、22・・・コンデンサ、23°・・導体中
空パイプ、25・・・スリーブアンテナの負極エレメン
ト、29・・・多素子アンテナの放射器としてのスリー
ブ・アンテナ。
FIG. 1 is a configuration diagram showing one embodiment of an h-type antenna according to the present invention, and FIG. 2 is a diagram showing another embodiment of the present invention, in which (a) shows a case where the h-type antenna is modified. Fig. 3 is a structural diagram showing an embodiment of the present invention, and (b) is a structural diagram showing an embodiment of the capacitor forming means used in the present invention, and Fig. 3 is a structural diagram when the present invention is applied to a sleeve antenna. Fig. 4 is a structural diagram showing an embodiment of a capacitor when the present invention is applied to a sleeve antenna, Fig. 5 is a structural diagram showing an embodiment of a multi-element antenna to which the present invention is applied, and Fig. 6 is a conventional structure diagram. 7(a) and (b) are structural diagrams showing a conventional h-type antenna and sleeve antenna, respectively. , FIG. 9, FIG. 10, FIG. 11, and FIG. 12 are a schematic diagram of a distributed constant line and a characteristic diagram thereof, respectively, which explain the present invention in detail. 14 and 14'...Parallel line, 16...Positive antenna element, 17...Negative antenna element, 18...Power feeding part, 19...Coaxial feed'iii line, 2
0... Center conductor of coaxial feed line, 21... Outer conductor of coaxial feed line, 22... Capacitor, 23°... Conductor hollow pipe, 25... Negative electrode element of sleeve antenna, 29... - Sleeve antenna as a radiator of a multi-element antenna.

Claims (2)

【特許請求の範囲】[Claims] (1)スリーブ・アンテナ或はh型アンテナ等の垂直ダ
イポール系アンテナ若しくはこれらを放射器とする多素
子アンテナの各エレメントを短縮したものに於いて、そ
の負極エレメントの下端部と該エレメントと平行してそ
の給電部に至る同軸給電線の外被導体との間に所要値の
コンデンサを接続したことを特徴とする短縮アンテナ。
(1) In a vertical dipole antenna such as a sleeve antenna or an H-type antenna, or a shortened version of each element of a multi-element antenna that uses these as a radiator, the lower end of the negative pole element is parallel to the element. A shortened antenna characterized in that a capacitor of a required value is connected between the sheath conductor of the coaxial feed line and the feed part of the coaxial feed line.
(2)前記アンテナの負極エレメントに平行して給電部
に至る同軸給電線が導体中空パイプ等で覆われた構造で
ある場合に於いて、前記コンデンサを該中空パイプと前
記負極エレメントの下端部との間に接続したことを特徴
とする特許請求の範囲(1)記載の短縮アンテナ。
(2) In the case where the coaxial feeder line running parallel to the negative electrode element of the antenna and extending to the feeder is covered with a conductive hollow pipe, etc., the capacitor is connected to the hollow pipe and the lower end of the negative electrode element. The shortened antenna according to claim (1), characterized in that the shortened antenna is connected between the antennas.
JP24681884A 1984-11-21 1984-11-21 Loaded antenna Pending JPS61125205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24681884A JPS61125205A (en) 1984-11-21 1984-11-21 Loaded antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24681884A JPS61125205A (en) 1984-11-21 1984-11-21 Loaded antenna

Publications (1)

Publication Number Publication Date
JPS61125205A true JPS61125205A (en) 1986-06-12

Family

ID=17154144

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24681884A Pending JPS61125205A (en) 1984-11-21 1984-11-21 Loaded antenna

Country Status (1)

Country Link
JP (1) JPS61125205A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005260603A (en) * 2004-03-11 2005-09-22 Maspro Denkoh Corp Antenna system
JP2005277954A (en) * 2004-03-25 2005-10-06 Maspro Denkoh Corp Yagi-uda antenna equipment
JP2007049213A (en) * 2004-12-03 2007-02-22 Mitsubishi Electric Corp Antenna system
JP2009218925A (en) * 2008-03-11 2009-09-24 Mitsubishi Cable Ind Ltd Antenna system
JP2010081433A (en) * 2008-09-26 2010-04-08 Mitsubishi Cable Ind Ltd Antenna device and method for manufacturing the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005260603A (en) * 2004-03-11 2005-09-22 Maspro Denkoh Corp Antenna system
JP2005277954A (en) * 2004-03-25 2005-10-06 Maspro Denkoh Corp Yagi-uda antenna equipment
JP2007049213A (en) * 2004-12-03 2007-02-22 Mitsubishi Electric Corp Antenna system
JP2009218925A (en) * 2008-03-11 2009-09-24 Mitsubishi Cable Ind Ltd Antenna system
JP2010081433A (en) * 2008-09-26 2010-04-08 Mitsubishi Cable Ind Ltd Antenna device and method for manufacturing the same

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