JPH0537227A - Circularly polarized wave microstrip antenna and its frequency adjustment method - Google Patents
Circularly polarized wave microstrip antenna and its frequency adjustment methodInfo
- Publication number
- JPH0537227A JPH0537227A JP19016691A JP19016691A JPH0537227A JP H0537227 A JPH0537227 A JP H0537227A JP 19016691 A JP19016691 A JP 19016691A JP 19016691 A JP19016691 A JP 19016691A JP H0537227 A JPH0537227 A JP H0537227A
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- Prior art keywords
- conductor
- frequency
- circularly polarized
- microstrip antenna
- adjusting
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘電体基板の一方の表
面に接地導体が形成され、他方の表面に放射導体が形成
されてなる円偏波マイクロストリップアンテナ及びその
周波数調整方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarized microstrip antenna in which a ground conductor is formed on one surface of a dielectric substrate and a radiation conductor is formed on the other surface, and a frequency adjusting method thereof. is there.
【０００２】[0002]
【従来の技術】図７は、従来の円偏波マイクロストリッ
プアンテナの平面図である。同図に示す従来の円偏波マ
イクロストリッアンテナ７は、円形の誘電体基板４の一
方の表面全体に接地導体（図では見えていない）が形成
されるとともに、他方の表面の中央位置に放射導体８が
形成され、前記接地導体面側から不図示の同軸ケーブル
により中心Ｏから径方向に偏心させて設けられた放射導
体８の給電点Ｐに給電されるようになっている。2. Description of the Related Art FIG. 7 is a plan view of a conventional circularly polarized microstrip antenna. In the conventional circularly polarized microstrip antenna 7 shown in the figure, a ground conductor (not visible in the figure) is formed on one entire surface of the circular dielectric substrate 4 and the other surface is radiated to the center position. A conductor 8 is formed and is fed from the ground conductor surface side to a feeding point P of a radiating conductor 8 provided eccentrically in a radial direction from a center O by a coaxial cable (not shown).
【０００３】上記放射導体８は、円形を成し、中心Ｏと
給電点Ｐとを結ぶ直線Ｍに対して±４５°傾斜させた２
本の直線ｍ，ｎと交叉する４つの外周縁端部には、円偏
波の電波を放射するための矩形状の突起８ａ〜８ｄがそ
れぞれ形成されている。The radiation conductor 8 has a circular shape and is inclined ± 45 ° with respect to a straight line M connecting the center O and the feeding point P.
Rectangular protrusions 8a to 8d for radiating circularly polarized radio waves are respectively formed at four outer peripheral edge portions that intersect the straight lines m and n of the book.
【０００４】従来、上記突起８ａ〜８ｄの長さを短くす
ると、円偏波の長径と短径との比である軸比が変化する
とともに、該軸比が最小となる共振周波数が上方に変化
することが知られ、この特性を利用して円偏波マイクロ
ストリップアンテナ７の軸比調整と共振周波数の調整と
が行われている。Conventionally, when the lengths of the protrusions 8a to 8d are shortened, the axial ratio, which is the ratio of the major axis to the minor axis of circularly polarized waves, changes, and the resonance frequency at which the axial ratio becomes minimum changes upward. It is known that this characteristic is used to adjust the axial ratio and the resonance frequency of the circularly polarized microstrip antenna 7.
【０００５】すなわち、円偏波マイクロストリップアン
テナ７の共振周波数は、一般に放射導体７の直径Ｒ、誘
電体基板４の比誘電率ε及びその厚さｔにより決定され
ることから、これら３つのパラメータの設計値を適当に
設定して円偏波マイクロストリップアンテナ７の初期周
波数（無調整の時の共振周波数）を目標周波数より低く
目に設定しておき、上記４つの突起８ａ〜８ｄを同量ず
つ切削し、その長さＬｔを短くすることにより軸比を最
小に調整するとともに、該軸比が最小となる共振周波数
を徐々に目標周波数まで上昇させるようにしている。That is, since the resonance frequency of the circularly polarized microstrip antenna 7 is generally determined by the diameter R of the radiation conductor 7, the relative permittivity ε of the dielectric substrate 4 and its thickness t, these three parameters are used. Of the circularly polarized microstrip antenna 7 is set to a value lower than the target frequency, and the four protrusions 8a to 8d are equal in amount. The axial ratio is adjusted to the minimum by cutting each of them and shortening the length Lt, and the resonance frequency at which the axial ratio is minimized is gradually increased to the target frequency.
【０００６】[0006]
【発明が解決しようとする課題】上記従来の円偏波マイ
クロストリップアンテナ７は、円偏波発生用の突起８ａ
〜８ｄを切削することにより共振周波数を徐々に上昇さ
せて共振周波数を目標値に調整することは可能である
が、共振周波数を低下させる調整部は設けられていない
ので、共振周波数を徐々に低下させて周波数調整するこ
とは困難になっている。このため、前記突起８ａ〜８ｄ
を削り過ぎ、調整すべき共振周波数が目標周波数をオー
バーした場合には、周波数調整不良となり、製造工程に
おける収率を低下させることとなっている。The conventional circularly polarized microstrip antenna 7 described above has a projection 8a for generating a circularly polarized wave.
Although it is possible to gradually increase the resonance frequency by cutting ~ 8d to adjust the resonance frequency to the target value, the resonance frequency is gradually decreased because no adjustment unit for decreasing the resonance frequency is provided. Therefore, it is difficult to adjust the frequency. Therefore, the protrusions 8a to 8d
If the resonance frequency to be adjusted exceeds the target frequency by cutting too much, the frequency adjustment becomes defective and the yield in the manufacturing process is reduced.
【０００７】また、上記突起８ａ〜８ｄを切削すること
により円偏波の軸比と共振周波数の両方を同時に調整し
ているので、両者をバランスよく調整することも困難で
ある。Further, since both the axial ratio of the circularly polarized wave and the resonance frequency are adjusted at the same time by cutting the projections 8a to 8d, it is difficult to adjust both in a well-balanced manner.
【０００８】本発明は、上記課題に鑑みてなされたもの
であり、軸比等の他の特性に影響を与えることなく共振
周波数を上下両方向に調整することのできる円偏波マイ
クロストリップアンテナ及びその周波数調整方法を提供
することを目的とする。The present invention has been made in view of the above problems, and a circularly polarized microstrip antenna capable of adjusting the resonance frequency in both up and down directions without affecting other characteristics such as axial ratio and the like. An object is to provide a frequency adjustment method.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に、請求項１記載の発明は、誘電体基板の一方面に接地
導体が形成されるとともに、他方面に放射導体が形成さ
れ、該放射導体に偏心させて設けられた給電点に給電さ
れる円偏波マイクロストリップアンテナであって、上記
放射導体はその外周縁端部であって、中心と上記給電点
とを結ぶ方向を基準として４５×（２Ｎ＋１）°（Ｎは
整数）の位置にそれぞれ軸比調整用の突起又は切欠が形
成されるとともに、９０Ｎ°（Ｎは整数）の位置にそれ
ぞれ１又は２以上の周波数調整用の突起が形成され、か
つ、該突起の基端部近傍に１又は２以上の周波数調整用
の導体欠除部が形成されたものである。In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a ground conductor is formed on one surface of a dielectric substrate and a radiation conductor is formed on the other surface thereof. A circularly polarized microstrip antenna that is fed to a feeding point provided eccentrically to a radiation conductor, wherein the radiation conductor is an end portion of an outer peripheral edge of the radiation conductor with reference to a direction connecting a center and the feeding point. A projection or a notch for adjusting the axial ratio is formed at a position of 45 × (2N + 1) ° (N is an integer), and one or more projections for adjusting the frequency are provided at a position of 90 N ° (N is an integer). Is formed, and one or more conductor cutout portions for frequency adjustment are formed near the base end portion of the protrusion.
【００１０】また、請求２記載の発明は、前記放射導体
に形成された周波数調整用の突起を切削することによ
り、又は周波数調整用の導体欠除部を案内として該放射
導体の外周縁端部にスリット状の切欠を形成することに
より上記円偏波マイクロストリップアンテナの周波数調
整を行うものである。The invention according to claim 2 is characterized in that the frequency adjusting projection formed on the radiation conductor is cut, or the outer peripheral edge portion of the radiation conductor is guided by the frequency adjusting conductor notch. The frequency of the circularly polarized microstrip antenna is adjusted by forming a slit-shaped notch.
【００１１】[0011]
【作用】本発明によれば、円偏波マイクロストリップア
ンテナの放射導体の外周縁端部の上記４つの所定位置に
は周波数を調整するための突起と導体欠除部とが予め形
成されている。According to the present invention, a protrusion for adjusting the frequency and a conductor notch are formed in advance at the four predetermined positions on the outer peripheral edge of the radiation conductor of the circularly polarized microstrip antenna. .
【００１２】上記突起は、共振周波数を上方に調整する
ための調整部であって、４つの放射導体の外周縁端部に
形成された各突起を同量ずつ切削し、該各突起の長さを
短くすることにより円偏波マイクロストリップアンテナ
の共振周波数を上昇させることができる。The protrusions are adjusting portions for adjusting the resonance frequency upward, and the protrusions formed on the outer peripheral edge portions of the four radiation conductors are cut by the same amount, and the lengths of the protrusions are adjusted. The resonance frequency of the circularly polarized microstrip antenna can be increased by shortening.
【００１３】一方、上記導体欠除部は、共振周波数を下
方に調整するための調整部であって、該導体欠除部を案
内として放射導体を外周方向に切削し、４つの放射導体
の外周縁端部にスリット状の切欠を同数ずつ形成するこ
とにより円偏波マイクロストリップアンテナの共振周波
数を低下させることができる。On the other hand, the conductor cutout portion is an adjustment portion for adjusting the resonance frequency downward, and the radiation conductor is cut in the outer peripheral direction using the conductor cutout portion as a guide, and the radiation conductor is cut out from the four radiation conductors. The resonance frequency of the circularly polarized microstrip antenna can be lowered by forming the same number of slit-shaped notches in the peripheral edge portion.
【００１４】従って、円偏波マイクロストリップアンテ
ナは、上記４つの放射導体の外周縁端部に形成された各
突起を同量ずつ切削し、該各突起の長さを短くすること
により共振周波数を徐々に上昇させて共振周波数の調整
が行われる一方、上記４つの放射導体の外周縁端部にス
リット状の切欠をそれぞれ形成することにより共振周波
数を徐々に低下させて共振周波数の調整が行われる。Therefore, in the circularly polarized microstrip antenna, the protrusions formed on the outer peripheral edge portions of the four radiation conductors are cut by the same amount, and the length of each protrusion is shortened to reduce the resonance frequency. The resonance frequency is adjusted by gradually increasing the resonance frequency, and the resonance frequency is adjusted by gradually reducing the resonance frequency by forming slit-shaped notches in the outer peripheral edge portions of the four radiation conductors. .
【００１５】[0015]
【実施例】図１は、本発明に係る円偏波マイクロストリ
ップアンテナの一実施例を示す平面図である。また、図
２は、前記図１のＡ−Ａ線断面図である。1 is a plan view showing an embodiment of a circularly polarized microstrip antenna according to the present invention. FIG. 2 is a sectional view taken along the line AA of FIG.
【００１６】円偏波マイクロストリップアンテナ１は、
下表面全体に接地導体３が形成された円形の誘電体基板
４の上表面の中央部に、該誘電体基板４の直径Ｄよりも
十分に短い直径Ｒを有する円形状の放射導体２を形成し
て成り、前記接地導体３側から同軸ケーブル５により放
射導体２の中心Ｏから径方向に偏心させて設けられた給
電点Ｐに給電されるようになっている。上記同軸ケーブ
ル５の外導体５ａは、上記接地導体３に接続され、内導
体５ｂは、上記誘電体基板４を貫通して上表面の放射導
体２に接続されている。The circularly polarized microstrip antenna 1 is
A circular radiating conductor 2 having a diameter R sufficiently shorter than the diameter D of the dielectric substrate 4 is formed in the central portion of the upper surface of the circular dielectric substrate 4 having the ground conductor 3 formed on the entire lower surface. Power is supplied from the side of the grounding conductor 3 to the feeding point P provided by being eccentric in the radial direction from the center O of the radiation conductor 2 by the coaxial cable 5. The outer conductor 5a of the coaxial cable 5 is connected to the ground conductor 3, and the inner conductor 5b penetrates the dielectric substrate 4 and is connected to the radiation conductor 2 on the upper surface.
【００１７】また、前記放射導体２の外周縁端部であっ
て、該放射導体２の中心Ｏから給電点Ｐを通る半径方向
を基準として４５×（２Ｎ＋１）°（Ｎは整数）方向、
すなわち、４５°，１３５°，２２５°，３１５°方向
の位置には、それぞれ幅Ｗｔ、長さＬｔの矩形状の突部
２３ａ〜２３ｄが形成されている。なお、突起２１ａ，
２１ｃの長さＬｔは、突起２３ｂ，２３ｄよりも長く構
成されている。Further, at the outer peripheral edge portion of the radiation conductor 2, the direction of 45 × (2N + 1) ° (N is an integer) with reference to the radial direction passing from the center O of the radiation conductor 2 through the feeding point P,
That is, rectangular protrusions 23a to 23d having a width Wt and a length Lt are formed at positions in the 45 °, 135 °, 225 °, and 315 ° directions, respectively. The protrusions 21a,
The length Lt of 21c is longer than the protrusions 23b and 23d.
【００１８】上記突起２３ａ〜２３ｄは、円偏波の電波
を放射させるためのモード縮退分離素子であって、上記
放射導体２の外周縁端部の４ヵ所のうち少なくともいず
れか１ヵ所に突起が形成されていれば、円偏波を発生さ
せることができる。The projections 23a to 23d are mode degeneracy separation elements for radiating circularly polarized radio waves, and the projections are provided at least at any one of the four locations on the outer peripheral edge of the radiation conductor 2. If formed, circularly polarized waves can be generated.
【００１９】また、上記突起２３ａ〜２３ｄは、その長
さＬｔを変化させることにより円偏波の短径に対する長
径の比である軸比を変化させることができるとともに、
軸比が最小となる共振周波数を変化させることができる
ものである。突起２３ａ〜２３ｄの長さＬｔを短くする
と、軸比が最小となる共振周波数は上昇し、長くする
と、該共振周波数は低下する。Further, by changing the length Lt of the projections 23a to 23d, the axial ratio, which is the ratio of the long diameter to the short diameter of the circularly polarized wave, can be changed, and
The resonance frequency that minimizes the axial ratio can be changed. When the length Lt of the protrusions 23a to 23d is shortened, the resonance frequency at which the axial ratio becomes the minimum increases, and when the length Lt is increased, the resonance frequency decreases.
【００２０】従って、後述するように上記突起２３ａ〜
２３ｄの長さＬｔを調整することにより円偏波の短径に
対する長径の比である軸比が調整されるようになってい
る。Therefore, as will be described later, the projections 23a ...
By adjusting the length Lt of 23d, the axial ratio, which is the ratio of the major axis to the minor axis of the circularly polarized wave, is adjusted.
【００２１】また、上記放射導体２の外周縁端部であっ
て、上記半径方向を基準として９０Ｎ°（Ｎは整数）方
向、すなわち、０°，９０°，１８０°，２７０°方向
の位置には、それぞれ周波数調整用の突起２１ａ〜２１
ｄが５本ずつ形成されている。また、放射導体２の外周
部の上記突起２１ａ〜２１ｄの基端部近傍には、それぞ
れ周波数調整用の導体欠除部２２ａ〜２２ｄが４個ずつ
形成されている。At the outer peripheral edge of the radiating conductor 2, at positions of 90 N ° (N is an integer), that is, 0 °, 90 °, 180 °, 270 °, with respect to the radial direction. Are projections 21a to 21 for frequency adjustment, respectively.
Five d are formed. Further, four conductor notch portions 22a to 22d for frequency adjustment are formed near the base end portions of the protrusions 21a to 21d on the outer peripheral portion of the radiation conductor 2.
【００２２】なお、上記突起２１ａ〜２１ｄは、少なく
とも１本ずつ形成されていればよく、５本以上形成して
いてもよい。また、上記導体欠除部２２ａ〜２２ｄにつ
いても少なくとも１個ずつ形成されていればよく、４個
以上形成していてもよい。The projections 21a to 21d may be formed at least one each, and may be formed in five or more. Further, the conductor cutout portions 22a to 22d may be formed at least one each, and may be formed in four or more.
【００２３】図３は、放射導体２の外周縁端部に形成さ
れた周波数調整用の突起２１ａ及び導体欠除部２２ａと
軸比調整用の突起２３ａとの部分を拡大した図である。FIG. 3 is an enlarged view of the frequency adjusting protrusion 21a and the conductor notch 22a and the axial ratio adjusting protrusion 23a formed on the outer peripheral edge of the radiation conductor 2. As shown in FIG.
【００２４】５本の各突起２１ａは、適宜の幅Ｗと長さ
Ｌとを有し、適宜の間隔を設けて放射導体２の外周から
放射状に突設されている。また、４個の各導体欠除部２
２ａは、適宜の直径ｄを有する円形の穴で、上記突起２
１ａ間の隙間と中心Ｏとを結ぶ線上であって放射導体２
の外周縁端から予め設定された距離Ｓだけ内側に設けら
れている。Each of the five protrusions 21a has an appropriate width W and a length L, and is radially provided from the outer periphery of the radiating conductor 2 at appropriate intervals. Also, each of the four conductor cutout portions 2
2a is a circular hole having an appropriate diameter d,
The radiation conductor 2 is on the line connecting the gap between the 1a and the center O.
Is provided inside by a preset distance S from the outer peripheral edge.
【００２５】これら４個の導体欠除部２２ａは、誘電体
基板４に放射導体２が形成される前に予め誘電体基板４
に穿設されるか、或いは、放射導体２が形成された後に
誘電体基板４に穿設される。These four conductor cutout portions 22a are formed in advance on the dielectric substrate 4 before the radiation conductor 2 is formed on the dielectric substrate 4.
Or the dielectric substrate 4 after the radiation conductor 2 is formed.
【００２６】なお、上記導体欠除部２２ａ〜２２ｄは、
後述するように切欠２４を形成するためのガイドである
から、円形に限らず、楕円、矩形その他の任意の形状に
することができる。The conductor cutout portions 22a to 22d are
Since it is a guide for forming the cutout 24 as described later, it is not limited to a circular shape, but may be an elliptical shape, a rectangular shape, or any other shape.
【００２７】上記突起２１ａ〜２１ｄは、周波数を上方
に調整するためのもので、突起２１ａ〜２１ｄを切削し
（図３の突起２１ａの点線部参照）、その長さＬを短く
するのに応じて円偏波マイクロストリップアンテナ１の
共振周波数ｆｏを上昇させることができるものである。
特に４ヵ所の放射導体２の外周縁端部における各突起２
１ａ〜２１ｄを同量ずつ切削すると、円偏波マイクロス
トリップアンテナ１の特性、例えば入力インピーダンス
や円偏波の軸比等に影響を与えることなく共振周波数ｆ
ｏを徐々に上昇させることができる。The protrusions 21a to 21d are for adjusting the frequency upward, and the protrusions 21a to 21d are cut (see the dotted line portion of the protrusion 21a in FIG. 3) to shorten the length L thereof. The resonance frequency fo of the circularly polarized microstrip antenna 1 can be increased.
In particular, each protrusion 2 at the outer peripheral edge of the radiation conductor 2 at four locations
By cutting 1a to 21d by the same amount, the resonance frequency f can be obtained without affecting the characteristics of the circularly polarized microstrip antenna 1, such as the input impedance and the axial ratio of circularly polarized waves.
It is possible to gradually increase o.
【００２８】また、上記導体欠除部２２ａ〜２２ｄは、
周波数を下方に調整するためのもので、図３に示すよう
に導体欠除部２２ａを案内として外周方向に放射導体２
を切削し、放射導体２の外周縁端部にスリット状の切欠
２４を形成することにより、その切欠２４の数に応じて
共振周波数ｆｏを低下させることができるものである。
特に４ヵ所の放射導体２の外周縁端部にそれぞれ同数の
切欠２４を形成することにより円偏波マイクロストリッ
プアンテナ１の特性、例えば入力インピーダンス、円偏
波の軸比等に影響を与えることなく共振周波数ｆｏを徐
々に低下させることができる。The conductor cutout portions 22a to 22d are
This is for adjusting the frequency downward, and as shown in FIG.
By cutting and forming the slit-shaped notches 24 in the end portion of the outer peripheral edge of the radiation conductor 2, the resonance frequency fo can be reduced according to the number of the notches 24.
Particularly, by forming the same number of notches 24 at the outer peripheral edge portions of the four radiating conductors 2, the characteristics of the circularly polarized microstrip antenna 1 such as the input impedance and the axial ratio of circularly polarized waves are not affected. The resonance frequency fo can be gradually reduced.
【００２９】図４は、突起２１ａの切削量に対する共振
周波数の変化量（上昇量）の実験結果の一例を示す図で
ある。また、図５は、切欠２４の長さＳに対する周波数
の変化量（低下量）の実験結果の一例を示す図である。FIG. 4 is a diagram showing an example of an experimental result of the amount of change (the amount of increase) of the resonance frequency with respect to the cutting amount of the protrusion 21a. In addition, FIG. 5 is a diagram illustrating an example of an experimental result of a frequency change amount (a decrease amount) with respect to the length S of the notch 24.
【００３０】なお、図４に示す突起の切削量は、４つの
放射導体２の外周縁端部に形成された各突起２１ａ〜２
１ｄの切削量を示し、図５に示す切欠の長さＳは、４ヵ
所の外周縁端部に各１個ずつ切欠２４を形成するときの
該切欠２４の長さを示している。The cutting amounts of the protrusions shown in FIG. 4 are the same as those of the protrusions 21a to 21a formed on the outer peripheral edge portions of the four radiation conductors 2.
A cutting amount of 1d is shown, and the length S of the notch shown in FIG. 5 shows the length of the notch 24 when forming one notch 24 at each of the four outer peripheral edge portions.
【００３１】また、実験に使用した円偏波マイクロスト
リップアンテナ１は、共振周波数ｆｏ＝１．５７５ＧＨ
ｚのもので、各部の寸法は、
誘電体基板４；比誘電率ε＝２１．４、直径Ｄ＝３７ｍ
ｍ、厚さｔ＝６ｍｍ
放射導体２；直径Ｒ＝２０．６ｍｍの円形放射導体
周波数調整用突起２１ａ〜２１ｄ；幅Ｗ＝０．４ｍｍ、
長さＬ＝１ｍｍ
導体欠除部２２ａ〜２２ｄ；直径ｄ＝０．７ｍｍの円
形、形成可能な切欠２４の長さＳ＝０．２５ｍｍ〜０．
７５ｍｍ
軸比調整用突起２３ａ，２３ｃ；幅Ｗｔ＝１ｍｍ、長さ
Ｌｔ＝１ｍｍ
軸比調整用突起２３ｂ，２３ｄ；幅Ｗｔ＝１ｍｍ、長さ
Ｌｔ＝２ｍｍ
である。The circular polarization microstrip antenna 1 used in the experiment has a resonance frequency fo = 1.575 GH.
The size of each part is z. The dielectric substrate 4; relative permittivity ε = 21.4, diameter D = 37 m
m, thickness t = 6 mm Radiation conductor 2; Circular radiation conductor with diameter R = 20.6 mm 21a to 21d for frequency adjustment; Width W = 0.4 mm,
Length L = 1 mm Conductor cutouts 22a to 22d; circular shape with diameter d = 0.7 mm, length S of cutout 24 that can be formed S = 0.25 mm to 0.
75 mm Axial ratio adjusting projections 23a and 23c; width Wt = 1 mm, length Lt = 1 mm Axial ratio adjusting projections 23b and 23d; width Wt = 1 mm and length Lt = 2 mm.
【００３２】図４に示されるように、共振周波数ｆｏ
は、４つの放射導体２の外周縁端部の各突起２１ａ〜２
１ｄを０．１ｍｍ短くする毎におよそ０．７ＭＨｚずつ
上昇することが分かった。従って、４つの放射導体２の
外周縁端部の各突起２１ａ〜２１ｄを適当な量ずつ切削
することにより周波数を徐々に上昇させて円偏波マイク
ロストリップアンテナ１の共振周波数ｆｏの微調整を行
うことができる。As shown in FIG. 4, the resonance frequency fo
Are the projections 21a-2 of the outer peripheral edge of the four radiation conductors 2.
It was found that each time 1d was shortened by 0.1 mm, it increased by about 0.7 MHz. Therefore, the frequency is gradually increased by finely adjusting the resonance frequency fo of the circularly polarized wave microstrip antenna 1 by cutting each of the protrusions 21a to 21d at the outer peripheral edge of the four radiation conductors 2 by an appropriate amount. be able to.
【００３３】また、図５に示されるように、例えば４つ
の放射導体２の外周縁端部にそれぞれ長さＳ＝０．２５
ｍｍの切欠２４を１個ずつ形成すると、共振周波数ｆｏ
はおよそ２．５ＭＨｚ低下し、切欠２４の長さＳを０．
１ｍｍ長くする毎に共振周波数ｆｏの低下量は、およそ
１ＭＨｚずつ増加することが分かった。従って、適当な
長さの切欠２４が形成可能に導体欠除部２２ａ〜２２ｄ
を設け、４つの放射導体２の外周縁端部に形成される各
切欠２４の数を増加させることにより周波数を段階的に
低下させて円偏波マイクロストリップアンテナ１の共振
周波数ｆｏの微調整を行うことができる。Further, as shown in FIG. 5, for example, the length S = 0.25 is provided at the outer peripheral edge portions of the four radiation conductors 2, respectively.
When the notches 24 of mm are formed one by one, the resonance frequency fo
Is about 2.5 MHz, and the length S of the notch 24 is 0.
It was found that the reduction amount of the resonance frequency fo increases by about 1 MHz each time the length is increased by 1 mm. Therefore, the conductor notch portions 22a to 22d are formed so that the notch 24 having an appropriate length can be formed.
Is provided, the frequency is gradually reduced by increasing the number of the notches 24 formed at the outer peripheral edge portions of the four radiation conductors 2 to finely adjust the resonance frequency fo of the circularly polarized microstrip antenna 1. It can be carried out.
【００３４】次に、上記円偏波マイクロストリップアン
テナ１の周波数調整について説明する。円偏波マイクロ
ストリップアンテナ１の共振周波数ｆｏは、主に誘電体
基板４の厚さｔ、誘電体基板４の比誘電率ε及び放射導
体の直径Ｒのパラメータにより決定される。そこで、上
記３つのパラメータの設計値を適当に選定し、円偏波マ
イクロストリップアンテナ１の共振周波数ｆｏの初期周
波数（誘電体基板４の表裏面に放射導体２と接地導体３
とを形成し、無調整のときの軸比が最小となる共振周波
数）を目標値よりも少し低くなるようにしておく。例え
ば上述の図４に示した例では、初期周波数をおよそ１．
５７ＧＨｚに設定しておく。Next, the frequency adjustment of the circularly polarized microstrip antenna 1 will be described. The resonance frequency fo of the circularly polarized microstrip antenna 1 is mainly determined by parameters of the thickness t of the dielectric substrate 4, the relative permittivity ε of the dielectric substrate 4 and the diameter R of the radiation conductor. Therefore, the design values of the above three parameters are appropriately selected, and the initial frequency of the resonance frequency fo of the circularly polarized wave microstrip antenna 1 (the radiation conductor 2 and the ground conductor 3 on the front and back surfaces of the dielectric substrate 4) is selected.
And the resonance frequency at which the axial ratio is the minimum when there is no adjustment) is set to be slightly lower than the target value. For example, in the example shown in FIG. 4 above, the initial frequency is approximately 1.
It is set to 57 GHz.
【００３５】次に、円偏波の軸比が規格値以下でない場
合は、上記４つの軸比調整用の突起２３ａ〜２３ｄをそ
れぞれ同量ずつ削る作業を１回若しくは数回行うことに
より円偏波の軸比を規格値以下に調整する。次に、軸比
調整後の軸比が最小となる共振周波数ｆｏが目標周波数
以下であれば、上記周波数調整用の突起２１ａ〜２１ｄ
をそれぞれ同量ずつ削る作業を１回若しくは数回行うこ
とにより共振周波数ｆｏを徐々に上昇させて目標周波数
に調整する。例えば上述の図４に示した例では、目標周
波数１．５７５ＧＨｚに調整する。Next, when the axial ratio of the circularly polarized wave is not less than the standard value, the above-mentioned four axial ratio adjusting projections 23a to 23d are each shaved by the same amount by one or several times. Adjust the wave axial ratio below the standard value. Next, if the resonance frequency fo at which the axial ratio after adjustment of the axial ratio is the minimum is equal to or lower than the target frequency, the protrusions 21a to 21d for frequency adjustment are provided.
The resonance frequency fo is gradually increased by adjusting the target frequency by one or several times. For example, in the example shown in FIG. 4 described above, the target frequency is adjusted to 1.575 GHz.
【００３６】なお、上記切削作業において、１回の作業
で突起２１ａ〜２１ｄを１本ずつ切削するようにしても
よく、或いは１回の作業で突起２１ａ〜２１ｄの一部を
切削し、数回の作業で１本目の突起がなくなると、２本
目の突起２１ａ〜２１ｄを切削するようにしてもよい。In the above cutting work, the projections 21a to 21d may be cut one by one in a single operation, or a part of the projections 21a to 21d may be cut in a single operation and then several times. When the first protrusion disappears in the above work, the second protrusions 21a to 21d may be cut.
【００３７】そして、上記突起２１ａ〜２１ｄを削り過
ぎ、共振周波数ｆｏが目標周波数を超えた場合は、１回
の作業で導体欠除部２２ａ〜２２ｄを案内として４ヵ所
の放射導体２の外周縁端部にそれぞれ１個ずつ切欠２４
を形成する作業を１回又は数回繰り返して共振周波数ｆ
ｏを徐々に低下させて目標周波数に設定する。When the protrusions 21a to 21d are cut too much and the resonance frequency fo exceeds the target frequency, the outer peripheral edges of the four radiating conductors 2 are guided by the conductor notched portions 22a to 22d in one operation. One notch 24 at each end
The resonance frequency f by repeating the work of forming
The value o is gradually decreased to set the target frequency.
【００３８】一方、軸比調整後の共振周波数ｆｏが既に
目標周波数以上であれば、上述の導体欠除部２２ａ〜２
２ｄを案内とする切欠２４の形成作業により共振周波数
ｆｏを徐々に低下させて目標周波数に設定し、この作業
で共振周波数ｆｏが目標周波数以下に低下した場合は、
更に上述の突起２１ａ〜２１ｄの切削作業により共振周
波数ｆｏを徐々に上昇させて目標周波数に設定する。On the other hand, if the resonance frequency fo after the adjustment of the axial ratio is already equal to or higher than the target frequency, the conductor cutout portions 22a to 22a described above are obtained.
When the resonance frequency fo is gradually lowered to the target frequency by the work of forming the notch 24 with 2d as a guide, and the resonance frequency fo is lowered to the target frequency or lower by this work,
Further, the resonance frequency fo is gradually raised by the cutting work of the protrusions 21a to 21d to set the target frequency.
【００３９】なお、上記実施例では、円形の放射導体２
を有する円偏波マイクロストリップアンテナ１について
説明したが、本発明は、例えば図６に示すように方形の
放射導体２′であってもよく、その他任意の形状の放射
導体を有する円偏波マイクロストリップアンテナ１に適
用することができる。In the above embodiment, the circular radiation conductor 2 is used.
Although the circular polarization microstrip antenna 1 having the above has been described, the present invention may be a rectangular radiation conductor 2'as shown in FIG. 6, for example, or a circular polarization microstrip having a radiation conductor of any other shape. It can be applied to the strip antenna 1.
【００４０】[0040]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、誘電体基板の表裏面の接地導体と放射導体
とを形成してなる円偏波マイクロストリップアンテナに
おいて上記放射導体の外周縁端部であって、放射導体中
心と給電点とを結ぶ方向を基準として９０Ｎ°（Ｎは整
数）方向の位置に、それぞれ周波数を上方に調整するた
めの突起と周波数を下方に調整するための導体欠除部と
を形成したので、上記突起の長さ若しくは上記導体欠除
部を案内として形成される切欠の長さを調整することに
より他の特性に影響を与えることなく周波数を調整する
ことができる。As described above, according to the invention described in claim 1, in the circularly polarized microstrip antenna in which the ground conductor and the radiation conductor on the front and back surfaces of the dielectric substrate are formed, A protrusion for adjusting the frequency upward and a frequency for adjusting the frequency downward, respectively, at the outer peripheral edge portion, at a position in the direction of 90 N ° (N is an integer) with reference to the direction connecting the center of the radiation conductor and the feeding point. Since the conductor cutout portion is formed for adjusting the frequency without adjusting other characteristics by adjusting the length of the protrusion or the length of the cutout formed by using the conductor cutout portion as a guide. can do.
【００４１】また、請求項２記載の発明によれば、円偏
波マイクロストリップアンテナの放射導体の外周縁端部
の上記特定位置に予め形成された周波数を上方に調整す
るための突起を切削することにより、又は周波数を下方
に調整するための導体欠除部を案内として切欠を形成す
ることにより周波数の調整を行うようにしたので、他の
特性に影響を与えることなく周波数の調整を簡単に行う
ことができる。According to the second aspect of the present invention, the protrusion for adjusting the frequency upward formed in advance at the specific position on the outer peripheral edge of the radiation conductor of the circularly polarized microstrip antenna is cut. By adjusting the frequency, or by forming the notch with the conductor notch for adjusting the frequency downward as a guide, the frequency can be adjusted easily without affecting other characteristics. It can be carried out.
【００４２】また、周波数調整作業において目標周波数
を超えた場合にも、逆方向に周波数を再調整することが
でき、周波数の調整不良を低減することができる。Further, even when the target frequency is exceeded in the frequency adjustment work, the frequency can be readjusted in the opposite direction, and the frequency adjustment error can be reduced.
【図１】本発明に係る円偏波マイクロストリップアンテ
ナの一実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of a circular polarization microstrip antenna according to the present invention.
【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】放射導体の外周縁端部に形成された周波数調整
用の突起及び導体欠除部と軸比調整用の突起の部分を拡
大した図である。FIG. 3 is an enlarged view of a frequency adjusting protrusion and a conductor notch formed on the outer peripheral edge of the radiating conductor, and an axial ratio adjusting protrusion.
【図４】周波数調整用突起の切削量に対する周波数の変
化量を示す図である。FIG. 4 is a diagram showing a change amount of frequency with respect to a cutting amount of a frequency adjusting protrusion.
【図５】切欠の長さに対する周波数の変化量を示す図で
ある。FIG. 5 is a diagram showing the amount of change in frequency with respect to the length of a notch.
【図６】本発明に係る円偏波マイクロストリップアンテ
ナの第２実施例の放射導体の形状を示す図である。FIG. 6 is a diagram showing the shape of a radiation conductor of a second embodiment of the circularly polarized microstrip antenna according to the present invention.
【図７】従来の円偏波マイクロストリップアンテナの一
実施例を示す平面図である。FIG. 7 is a plan view showing an embodiment of a conventional circularly polarized microstrip antenna.
１ 円偏波マイクロストリップアンテナ ２，２′ 放射導体 ３ 接地導体 ４ 誘電体基板 ５ 給電用同軸ケーブル ２１ａ〜２１ｄ，２３ａ〜２３ｄ 突起 ２２ａ〜２２ｄ 導体欠除部 Ｐ 給電点 1 circular polarized microstrip antenna 2,2 'radiation conductor 3 Ground conductor 4 Dielectric substrate 5 Coaxial cable for feeding 21a-21d, 23a-23d Protrusion 22a to 22d Conductor cutaway portion P feeding point
Claims (2)
れるとともに、他方面に放射導体が形成され、該放射導
体に偏心させて設けられた給電点に給電される円偏波マ
イクロストリップアンテナであって、上記放射導体はそ
の外周縁端部であって、中心と上記給電点とを結ぶ方向
を基準として４５×（２Ｎ＋１）°（Ｎは整数）の位置
にそれぞれ軸比調整用の突起又は切欠が形成されるとと
もに、９０Ｎ°（Ｎは整数）の位置にそれぞれ１又は２
以上の周波数調整用の突起が形成され、かつ、該突起の
基端部近傍に１又は２以上の周波数調整用の導体欠除部
が形成されていることを特徴とする円偏波マイクロスト
リップアンテナ。1. A circularly polarized microstrip in which a grounding conductor is formed on one surface of a dielectric substrate and a radiation conductor is formed on the other surface, and power is fed to a feeding point provided eccentrically to the radiation conductor. In the antenna, the radiating conductor is an end portion of an outer peripheral edge of the radiating conductor and is used for adjusting an axial ratio at a position of 45 × (2N + 1) ° (N is an integer) with reference to a direction connecting a center and the feeding point. Protrusions or notches are formed, and 1 or 2 at 90 N ° (N is an integer), respectively.
A circularly polarized wave microstrip antenna characterized in that the frequency adjusting protrusion is formed, and one or more conductor adjusting portions for frequency adjustment are formed in the vicinity of the base end of the protrusion. .
の突起を切削することにより、又は周波数調整用の導体
欠除部を案内として該放射導体の外周縁端部にスリット
状の切欠を形成することにより周波数の調整を行うこと
を特徴とする請求項１記載の円偏波マイクロストリップ
アンテナの周波数調整方法。2. A slit-like notch is formed at the outer peripheral edge of the radiation conductor by cutting a frequency-adjusting protrusion formed on the radiation conductor or by using a frequency-adjusting conductor notch as a guide. The frequency adjustment method for a circularly polarized wave microstrip antenna according to claim 1, wherein the frequency is adjusted by performing the adjustment.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3190166A JP2816455B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna and its frequency adjustment method |
| DE69232020T DE69232020T2 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized stripline antenna and method for its frequency adjustment |
| DE69227222T DE69227222T2 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized stripline antenna and method for adjusting its frequency |
| EP92112868A EP0525726B1 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized wave microstrip antenna and frequency adjusting method therefor |
| EP97121860A EP0836241B1 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized wave microstrip antenna and frequency adjusting method therefor |
| US07/922,692 US5410322A (en) | 1991-07-30 | 1992-07-30 | Circularly polarized wave microstrip antenna and frequency adjusting method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3190166A JP2816455B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna and its frequency adjustment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0537227A true JPH0537227A (en) | 1993-02-12 |
| JP2816455B2 JP2816455B2 (en) | 1998-10-27 |
Family
ID=16253533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3190166A Expired - Lifetime JP2816455B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna and its frequency adjustment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816455B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0525805U (en) * | 1991-09-11 | 1993-04-02 | 松下電器産業株式会社 | Micro strip antenna |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141006A (en) * | 1982-02-17 | 1983-08-22 | Nippon Telegr & Teleph Corp <Ntt> | Diversity antenna for circular polarized wave |
| JPS58215808A (en) * | 1982-06-10 | 1983-12-15 | Matsushita Electric Ind Co Ltd | Microstrip antenna |
| JPS63100802A (en) * | 1986-10-17 | 1988-05-02 | Matsushita Electric Ind Co Ltd | Manufacture of waveguide |
-
1991
- 1991-07-30 JP JP3190166A patent/JP2816455B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141006A (en) * | 1982-02-17 | 1983-08-22 | Nippon Telegr & Teleph Corp <Ntt> | Diversity antenna for circular polarized wave |
| JPS58215808A (en) * | 1982-06-10 | 1983-12-15 | Matsushita Electric Ind Co Ltd | Microstrip antenna |
| JPS63100802A (en) * | 1986-10-17 | 1988-05-02 | Matsushita Electric Ind Co Ltd | Manufacture of waveguide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0525805U (en) * | 1991-09-11 | 1993-04-02 | 松下電器産業株式会社 | Micro strip antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2816455B2 (en) | 1998-10-27 |
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