JP2852377B2 - Circularly polarized microstrip antenna - Google Patents
Circularly polarized microstrip antennaInfo
- Publication number
- JP2852377B2 JP2852377B2 JP3190167A JP19016791A JP2852377B2 JP 2852377 B2 JP2852377 B2 JP 2852377B2 JP 3190167 A JP3190167 A JP 3190167A JP 19016791 A JP19016791 A JP 19016791A JP 2852377 B2 JP2852377 B2 JP 2852377B2
- Authority
- JP
- Japan
- Prior art keywords
- circularly polarized
- radiation conductor
- conductor
- microstrip antenna
- resonance frequency
- 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.)
- Expired - Lifetime
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
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.
【０００２】[0002]
【従来の技術】従来、例えば特開平３−８０６０３号公
報に示されるように放射導体の外周縁端部の特定の位置
に円偏波発生用の突起又は切欠が形成され、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が知られている。2. Description of the Related Art Conventionally, as shown in, for example, JP-A-3-80603, a projection or notch for generating circularly polarized waves is formed at a specific position on the outer peripheral edge of a radiation conductor, and the radiation conductor is eccentric. 2. Description of the Related Art A circularly polarized microstrip antenna that is fed to a feeding point provided in such a manner is known.
【０００３】図７は、上記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。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、方形の
誘電体基板９の一方面全体に接地導体（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。FIG. 7 is a plan view showing one embodiment of the above-mentioned conventional circularly polarized microstrip antenna. In the conventional circularly polarized microstrip antenna 7 shown in FIG. 1, a ground conductor (not shown in the figure) is formed on one entire surface of a rectangular dielectric substrate 9 and a radiation conductor 8 is provided at the center of the other surface. Is formed, and power is supplied to the feed point P of the radiation conductor 8 provided eccentrically in the radial direction from the center O by a coaxial cable (not shown) from the ground conductor surface side.
【０００４】上記放射導体８は、半径Ｒの円形を成し、
中心Ｏと給電点Ｐとを結ぶ直線Ｍ１に対して４５°傾斜
させた直線Ｍ２上であって外周縁端部に矩形状の突起８
１ａ，８１ｂが形成され、上記直線Ｍ１に対して−４５
°傾斜させた直線Ｍ３上であって外周縁端部に切欠８２
ａ，８２ｂが形成されている。The radiation conductor 8 has a circular shape with a radius R,
A rectangular projection 8 is formed on a straight line M2 inclined at 45 ° with respect to a straight line M1 connecting the center O and the feeding point P at the outer peripheral edge.
1a and 81b are formed, and -45 with respect to the straight line M1.
The notch 82 is on the straight line M3 inclined at the outer peripheral edge.
a, 82b are formed.
【０００５】上記突起８１ａ，８１ｂ及び切欠８２ａ，
８２ｂは、円偏波を発生させるためのモード縮退分離素
子として動作するものであり、これら突起８１ａ，８１
ｂ及び切欠８２ａ，８２ｂの長さを変化させると、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変化するようになって
いる。The projections 81a, 81b and the notches 82a,
The projection 82a operates as a mode degenerate separation element for generating circularly polarized waves.
When the lengths of b and the notches 82a and 82b are changed, the axial ratio, which is the ratio between the major axis and the minor axis of the circularly polarized wave, changes,
The resonance frequency at which the axial ratio is minimized changes.
【０００６】すなわち、上記突起８１ａ，８１ｂの長さ
Ｌ１を短くすると、共振周波数は上昇し、上記切欠８２
ａ，８２ｂの長さＬ２を長くすると、共振周波数は低下
する。That is, when the length L1 of the projections 81a and 81b is shortened, the resonance frequency increases, and the notch 82
When the length L2 of a and 82b is increased, the resonance frequency decreases.
【０００７】従って、従来、上記突起８１ａ，８１ｂ及
び切欠８２ａ，８２ｂを切削し、突起８１ａ，８１ｂの
長さＬ１又は切欠８２ａ，８２ｂの長さＬ２を調節する
ことにより円偏波マイクロストリップアンテナ７の周波
数調整を行う方法が提案されている。Therefore, conventionally, the circularly polarized microstrip antenna 7 is formed by cutting the projections 81a and 81b and the notches 82a and 82b and adjusting the length L1 of the projections 81a and 81b or the length L2 of the notches 82a and 82b. Has been proposed.
【０００８】[0008]
【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８１
ａ，８１ｂ及び切欠８２ａ，８２ｂを切削して円偏波の
軸比と共振周波数の両方を同時に調整しなければなら
ず、両者をバランスよく調整することは困難である。The above-described conventional circularly polarized microstrip antenna 7 has a projection 81 for generating circularly polarized waves.
a, 81b and the notches 82a, 82b must be cut to adjust both the axial ratio of the circularly polarized wave and the resonance frequency at the same time, and it is difficult to adjust both in a well-balanced manner.
【０００９】また、円偏波発生用の突起８１ａ，８１ｂ
の長さＬ１及び切欠８２ａ，８２ｂを長さＬ２を変化さ
せると、例えば入力インピーダンスや指向性等の特性に
も影響があり、周波数のみを調整することは困難であ
る。Also, protrusions 81a and 81b for generating circularly polarized waves are provided.
When the length L1 and the length L2 of the notches 82a and 82b are changed, characteristics such as input impedance and directivity are affected, and it is difficult to adjust only the frequency.
【００１０】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周波
数を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 has as its object to provide a circularly polarized microstrip antenna whose frequency can be adjusted without affecting other characteristics such as an axial ratio. And
【００１１】[0011]
【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、放射導体中心と上
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
置にそれぞれ共振周波数を上昇方向に調整するための１
又は２以上の突起が形成されたものである。なお、上記
周波数調整用の突起に代えて共振周波数を低下方向に調
整するための切欠を形成してもよい（請求項２）。According to a first aspect of the present invention, a ground conductor is formed on one surface of a dielectric substrate, and a radiation conductor is formed on the other surface. A circularly polarized microstrip antenna that is fed to a feed point provided eccentrically to a radiation conductor, wherein the radiation conductor is an outer peripheral edge portion of the microstrip antenna, the direction connecting the radiation conductor center and the feed point. 45 × (2N + 1) as reference
A projection or a notch for adjusting the axial ratio is formed at a position of ° (N is an integer), and a protrusion or a notch for adjusting the resonance frequency in a rising direction at a position of 90 N ° (N is an integer).
Alternatively, two or more projections are formed. Note that a cutout for adjusting the resonance frequency in a decreasing direction may be formed in place of the frequency adjustment protrusion (claim 2).
【００１２】また、請求項３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
第１の給電点と第２の給電点とにそれぞれ給電される円
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、放射導体中心と上記第１
の給電点とを結ぶ方向に対して０°及び１８０°の位置
及び放射導体中心と上記第２の給電点とを結ぶ方向に対
して０°及び１８０°の位置にそれぞれ共振周波数を上
昇方向に調整するための１又は２以上の突起が形成され
ているものである。According to a third aspect of the present invention, in the first aspect, a ground conductor is formed on one surface of the dielectric substrate, and a radiating conductor is formed on the other surface, and the radiating conductor is eccentrically provided. A circularly polarized microstrip antenna which is fed to a feeding point and a second feeding point, wherein the radiation conductor is an outer peripheral edge portion, and a radiation conductor center and the first
The resonance frequencies are increased in the directions of 0 ° and 180 ° with respect to the direction connecting the feeding point of the first and second positions, and at the positions of 0 ° and 180 ° with respect to the direction connecting the center of the radiation conductor and the second feeding point. One or two or more protrusions for adjustment are formed.
【００１３】[0013]
【作用】請求項１記載の発明によれば、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０°，９０°，１８０°，２７０°の位置にそ
れぞれ形成された１又は２以上の突起は、共振周波数を
上昇方向に調整するための調整部であって、該突起の長
さを変化させると、円偏波の軸比や指向性や入力インピ
ーダンス等の他の特性に影響を与えることなく共振周波
数を変化させることができるものである。According to the present invention, the outer peripheral edge of the radiation conductor is located at 0 °, 90 °, 180 °, and 270 ° with respect to the direction connecting the center of the radiation conductor and the feeding point. The one or more protrusions formed are adjustment portions for adjusting the resonance frequency in the ascending direction. When the length of the protrusions is changed, the axial ratio, the directivity, and the input impedance of the circularly polarized wave are changed. The resonance frequency can be changed without affecting other characteristics.
【００１４】すなわち、突起を切削してその長さを短く
すると、円偏波マイクロストリップアンテナの共振周波
数は上昇する。That is, when the length of the protrusion is reduced by cutting, the resonance frequency of the circularly polarized microstrip antenna increases.
【００１５】従って、円偏波マイクロストリップアンテ
ナは、上記放射導体の外周縁端部の９０Ｎ°（Ｎ＝０，
１，２，３）の位置に形成された各突起を同量ずつ切削
し、その長さを短くすることにより円偏波の軸比や指向
性や入力インピーダンス等の他の特性に影響を与えるこ
となく共振周波数を徐々に上昇させて目標値に調整する
ことができる。Therefore, the circularly polarized microstrip antenna has a 90 N ° (N = 0,
By cutting each projection formed at the position of (1, 2, 3) by the same amount and shortening its length, other characteristics such as the axial ratio, directivity and input impedance of circularly polarized waves are affected. Without increasing the resonance frequency, the resonance frequency can be gradually increased and adjusted to the target value.
【００１６】また、請求項２記載の発明によれば、切欠
は、円偏波の軸比や指向性や入力インピーダンス等の他
の特性に影響を与えることなく共振周波数を変化させる
ことができるものであって、該切欠を切削してその長さ
を長くすると、円偏波マイクロストリップアンテナの共
振周波数は低下する。According to the second aspect of the present invention, the notch can change the resonance frequency without affecting other characteristics such as the axial ratio of circularly polarized waves, directivity, and input impedance. If the notch is cut to increase its length, the resonance frequency of the circularly polarized microstrip antenna decreases.
【００１７】従って、円偏波マイクロストリップアンテ
ナは、上記放射導体の外周縁端部の９０Ｎ°（Ｎ＝０，
１，２，３）の位置に形成された各切欠を同量ずつ切削
し、その長さを長くすることにより円偏波の軸比や指向
性や入力インピーダンス等の他の特性に影響を与えるこ
となく共振周波数を徐々に低下させて目標値に調整する
ことができる。Therefore, the circularly polarized microstrip antenna has a 90N ° (N = 0,
Each notch formed at the position of (1, 2, 3) is cut by the same amount, and other characteristics such as the axial ratio, directivity, and input impedance of circularly polarized waves are affected by increasing the length. Thus, the resonance frequency can be gradually lowered and adjusted to the target value.
【００１８】また、請求項３記載の発明によれば、放射
導体の外周縁端部であって放射導体中心と第１の給電点
とを結ぶ方向に対して０°，１８０°の位置と放射導体
中心と第２の給電点とを結ぶ方向に対して０°，１８０
°の位置とにそれぞれ形成された１又は２以上の突起
は、上述と同様に円偏波の軸比や指向性や入力インピー
ダンス等の他の特性に影響を与えることなく共振周波数
を調整することのできる調整部である。上記突起を切削
してその長さを短くすると、共振周波数は上昇する。[0018] According to the third aspect of the invention Symbol mounting, 0 ° to the direction connecting the A outer peripheral edge radiating conductor around a first feed point of the radiating conductor, and the position of 180 ° 0 °, 180 ° with respect to the direction connecting the radiation conductor center and the second feeding point
Respectively formed on the position of ° 1 or 2 or more collision force
Is an adjustment unit that can adjust the resonance frequency without affecting other characteristics such as the axial ratio, the directivity, and the input impedance of the circularly polarized wave, as described above. A shorter the length by cutting the projections, the resonant frequency is Ru on Noborisu.
【００１９】従って、円偏波マイクロストリップアンテ
ナは、上記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、各突起の長さを短くすることにより、
円偏波の軸比や指向性や入力インピーダンス等の他の特
性に影響を与えることなく共振周波数を徐々に上昇させ
て目標値に調整することができる。[0019] Thus, the circularly polarized wave microstrip antenna, to each collision force formed on the outer circumferential edge of the radiating conductor <br/> cut by the same amount, to reduce the length of each projection And
Increasing the resonance frequency gradually without affecting other characteristics such as circular polarization axis ratio, directivity and input impedance
It can be adjusted to a goal value each.
【００２０】[0020]
【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。FIG. 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.
【００２１】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
A circular radiation conductor 2 having a diameter R sufficiently shorter than the diameter D of the dielectric substrate 4 is formed at the center of the upper surface of the circular dielectric substrate 4 having the ground conductor 3 formed on the entire lower surface. The power is supplied from the ground conductor 3 side to a feed point P provided eccentrically 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 through the dielectric substrate 4 and is connected to the radiation conductor 2 on the upper surface.
【００２２】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
２１ａ〜２１ｄが形成されている。なお、突起２１ａ，
２１ｃの長さＬｔは、突起２１ｂ，２１ｄよりも長く構
成されている。A 45 × (2N + 1) ° (N is an integer) direction which is a radial direction passing through the feeding point P from the center O of the radiation conductor 2 at the outer peripheral edge of the radiation conductor 2;
That is, rectangular protrusions 21a to 21d having a width Wt and a length Lt are formed at positions in the directions of 45 °, 135 °, 225 °, and 315 °, respectively. The protrusions 21a,
The length Lt of 21c is longer than the protrusions 21b and 21d.
【００２３】上記突起２１ａ〜２１ｄ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 21a to 21d are mode degenerate separation elements for radiating circularly polarized radio waves, and the projections are formed in at least one of four locations on the outer peripheral edge of the radiation conductor 2. If it is formed, circular polarization can be generated.
【００２４】また、上記突起２１ａ〜２１ｄ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２１ａ〜２１ｄ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。The lengths Lt of the projections 21a to 21d can be changed to change the axial ratio, which is the ratio of the major axis to the minor axis of the circularly polarized wave.
The resonance frequency at which the axial ratio is minimized can be changed. When the length Lt of the protrusions 21a to 21d is shortened, the resonance frequency at which the axial ratio becomes minimum increases, and when the length Lt is increased, the resonance frequency decreases.
【００２５】従って、後述するように上記突起２１ａ〜
２１ｄ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 described later, the protrusions 21a to 21a
By adjusting the length Lt of 21d, the axial ratio, which is the ratio of the major axis to the minor axis of the circularly polarized wave, is adjusted.
【００２６】なお、円偏波の電波を放射させるために、
上記突起２１ａ〜２１ｄに代えて切欠を設け、該切欠の
長さを調整することにより上記軸比を調整するようにし
てもよい。切欠を設けた場合には、突起の場合とは逆に
その長さを短くすると、軸比が最小となる共振周波数は
低下し、長くすると、該共振周波数は上昇する。In order to emit a circularly polarized radio wave,
A cutout may be provided instead of the projections 21a to 21d, and the axial ratio may be adjusted by adjusting the length of the cutout. In the case where the notch is provided, the resonance frequency at which the axial ratio is minimized decreases when the length is shortened, and the resonance frequency increases when the length is increased.
【００２７】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、それぞれ幅Ｗ、長さＬの矩形状の突起２２
ａ〜２２ｄが形成されている。Further, the outer peripheral edge of the radiation conductor 2 is located in a 90N ° (N is an integer) direction, that is, a position in the 0 °, 90 °, 180 °, or 270 ° direction with respect to the radial direction. Is a rectangular projection 22 having a width W and a length L, respectively.
a to 22d are formed.
【００２８】上記突起２２ａ〜２２ｄは、円偏波マイク
ロストリップアンテナ１の共振周波数を調整するための
周波数調整部であって、該突起２２ａ〜２２ｄの長さＬ
を長くすると、前記共振周波数を低くすることができ、
短くすると、前記共振周波数は高くすることができるも
のである。The protrusions 22a to 22d are frequency adjusting portions for adjusting the resonance frequency of the circularly polarized microstrip antenna 1, and have a length L of the protrusions 22a to 22d.
When the length is longer, the resonance frequency can be lowered,
The shorter the resonance frequency, the higher the resonance frequency.
【００２９】従って、後述するように放射導体２の外周
縁端部の上記４ヵ所に形成された各突起２２１ａ〜２２
ｄを同量ずつ切削し、その長さＬ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１の特性、例え
ば、指向性、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を徐々に上昇させて周波
数調整をすることが可能になっている。Accordingly, as will be described later, each of the projections 221a to 221 formed at the four positions on the outer peripheral edge of the radiation conductor 2 is described below.
By cutting d by the same amount and reducing its length L, resonance can be achieved without affecting the characteristics of the circularly polarized microstrip antenna 1, such as directivity, input impedance, and axial ratio of circularly polarized waves. The frequency can be adjusted by gradually increasing the frequency.
【００３０】なお、本実施例では、放射導体２の外周縁
端部の上記４ヵ所に周波数調整用の突起２２ａ〜２２ｄ
を形成しているが、図３に示すように該突起２２ａ〜２
２ｄに代えて幅ｄ、長さＳの切欠２３ａ〜２３ｄを形成
してもよい。In this embodiment, the frequency adjusting projections 22a to 22d are provided at the four locations on the outer peripheral edge of the radiation conductor 2.
The protrusions 22a to 22a are formed as shown in FIG.
Notches 23a to 23d of width d and length S may be formed instead of 2d.
【００３１】前記切欠２３ａ〜２３ｄを形成した場合
は、突起２２ａ〜２２ｄの場合とは逆に該切欠２３ａ〜
２３ｄの長さＳを長くすると、前記共振周波数を低くす
ることができ、短くすると、前記共振周波数は高くする
ことができるものである。When the notches 23a to 23d are formed, the notches 23a to 23d are formed in a manner opposite to the case of the projections 22a to 22d.
By increasing the length S of 23d, the resonance frequency can be lowered, and by shortening it, the resonance frequency can be increased.
【００３２】従って、放射導体２の外周縁端部の上記４
ヵ所に形成された各切欠２３ａ〜２３ｄを同量ずつ切削
し、その長さＳを長くすることにより、円偏波マイクロ
ストリップアンテナ１の他の特性に影響を与えることな
く共振周波数を徐々に低下させて周波数調整をすること
が可能になる。Accordingly, the above-mentioned 4 at the outer peripheral edge of the radiation conductor 2
By cutting the notches 23a to 23d formed at the same locations by the same amount and increasing the length S, the resonance frequency is gradually lowered without affecting other characteristics of the circularly polarized microstrip antenna 1. Then, the frequency can be adjusted.
【００３３】図４は、上記突起２２ａ〜２２ｄの長さＬ
又は切欠２３ａ〜２３ｄの長さＳに対する共振周波数の
変化量の実験結果の一例を示す図である。FIG. 4 shows the length L of the projections 22a to 22d.
Alternatively, it is a figure showing an example of an experimental result of a change amount of a resonance frequency with respect to a length S of the notches 23a to 23d.
【００３４】同図は、共振周波数がおよそ１．５７５Ｇ
Ｈｚの円偏波マイクロストリップアンテナ１を用い、放
射導体２の外周縁端部の上記４ヵ所に形成された突起２
２ａ〜２２ｄ又は切欠２３ａ〜２３ｄを同時に同量ずつ
変化させて共振周波数の変化を調べたものである。The figure shows that the resonance frequency is about 1.575 G
Hz circularly polarized microstrip antenna 1, and projections 2 formed at the above four locations on the outer peripheral edge of radiation conductor 2.
2a to 22d or notches 23a to 23d are simultaneously changed by the same amount, and a change in resonance frequency is examined.
【００３５】また、同図において突起又は切欠の長さが
０ｍｍというのは、突起２２ａ〜２２ｄも切欠２３ａ〜
２３ｄも形成されていない状態であり、この時の共振周
波数を基準として突起２２ａ〜２２ｄの長さＬ又は切欠
２３ａ〜２３ｄの長さＳを変化させたときの共振周波数
の変化量を示している。In the figure, the fact that the length of the projection or notch is 0 mm means that the projections 22a to 22d also have the notches 23a to 23d.
23d is also not formed, and shows the amount of change in the resonance frequency when the length L of the protrusions 22a to 22d or the length S of the notches 23a to 23d is changed with reference to the resonance frequency at this time. .
【００３６】なお、実験に用い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＝１．５７５ＧＨｚ
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＝３７ｍｍ、厚さｔ＝６ｍｍ 放射導体２；直径Ｒ＝２０．６ｍｍの円形放射導体 軸比調整用突起２１ａ，２１ｃ；幅Ｗｔ＝１ｍｍ、長さＬｔ＝２ｍｍ 軸比調整用突起２１ｂ，２１ｄ；幅Ｗｔ＝１ｍｍ、長さＬｔ＝１ｍｍ 突起２２ａ〜２２ｄ；幅Ｗ＝０．７ｍｍ、長さＬ＝０〜１ｍｍ 切欠２３ａ〜２３ｄ；幅ｄ＝０．７ｍｍ、長さＳ＝０〜１ｍｍ である。The circularly polarized microstrip antenna 1 used in the experiment has a resonance frequency fo = 1.575 GHz.
The dimensions of each part are as follows: Dielectric substrate 4; relative permittivity ε = 21.4, diameter D = 37 mm, thickness t = 6 mm Radiating conductor 2: circular radiation conductor having diameter R = 20.6 mm Axial ratio adjustment Projections 21a, 21c; width Wt = 1 mm, length Lt = 2 mm projections 21b, 21d for axial ratio adjustment; width Wt = 1 mm, length Lt = 1 mm projections 22a to 22d; width W = 0.7 mm, length L = 0 to 1 mm Notches 23a to 23d; width d = 0.7 mm, length S = 0 to 1 mm.
【００３７】図４から分かるように共振周波数は、ほぼ
突起２２ａ〜２２ｄの長さＬ又は切欠２３ａ〜２３ｄの
長さＳに比例して変化し、その変化率は、突起２２ａ〜
２２ｄの長さＬを短くする場合、およそ＋１０ＭＨｚ／
ｍｍ、切欠２３ａ〜２３ｄの長さＳを長くする場合、お
よそ−１０ＭＨｚ／ｍｍである。As can be seen from FIG. 4, the resonance frequency changes substantially in proportion to the length L of the protrusions 22a to 22d or the length S of the cutouts 23a to 23d, and the rate of change is the same as that of the protrusions 22a to 22d.
When shortening the length L of 22d, approximately +10 MHz /
mm, and the length S of the notches 23a to 23d is approximately −10 MHz / mm.
【００３８】従って、突起２２ａ〜２２ｄ又は切欠２３
ａ〜２３ｄを微少量ずつ切削し、突起２２ａ〜２２ｄの
長さＬを短くすることにより、或いは切欠２３ａ〜２３
ｄの長さＳを長くすることにより共振周波数を数ＭＨｚ
単位で上昇又は低下させて周波数の微調整を行うことが
できる。Therefore, the projections 22a to 22d or the notches 23
a to 23d are cut little by little and the length L of the projections 22a to 22d is shortened or the notches 23a to 23d are cut.
The resonance frequency can be increased to several MHz by increasing the length S of d.
The frequency can be finely adjusted by increasing or decreasing in units.
【００３９】次に、上記突起２２ａ〜２２ｄを有する放
射導体２を備えた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２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の共振周波数の初期値（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 circularly polarized microstrip antenna 1 provided with the radiation conductor 2 having the projections 22a to 22d.
Will be described. The resonance frequency of the circularly polarized microstrip antenna 1 is determined mainly 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 2. Therefore, the design values of the above three parameters are appropriately selected, and the initial value of the resonance frequency of the circularly polarized microstrip antenna 1 (the radiation conductor 2 and the ground conductor 3 are formed on the front and back surfaces of the dielectric substrate 4, The resonance frequency at which the axial ratio at the time of adjustment becomes minimum) is set slightly lower than the target value. For example, in the example shown in FIG. 4 described above, the initial frequency is set to about 1.57 GHz.
【００４０】次に、円偏波の軸比が規格値外の場合は、
上記４つの軸比調整用の突起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円
偏波の軸比を規格値内に調整する。次に、周波数調整用
の突起２２ａ〜２２ｄ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 out of the standard value,
The operation of shaving the four axial ratio adjusting projections 21a to 21d by the same amount once or several times is performed to adjust the axial ratio of the circularly polarized wave to a standard value. Next, the work of shaving the frequency adjusting protrusions 22a to 22d by the same amount is performed for one time.
One or several times, the resonance frequency fo is gradually increased and adjusted to the target frequency. For example, in the example shown in FIG. 4, the target frequency is adjusted to 1.575 GHz.
【００４１】なお、放射導体２に上記突起２２ａ〜２２
ｄに代えて切欠２３ａ〜２３ｄを設けたものでは、上記
の場合とは逆に初期周波数を目標値よりも少し高めに設
定しておき、切欠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共振周波数ｆ
ｏを徐々に低下させて目標周波数に調整する。The projections 22a to 22a are provided on the radiation conductor 2.
In the case where notches 23a to 23d are provided in place of d, contrary to the above case, the initial frequency is set slightly higher than the target value, and the work of cutting each of the notches 23a to 23d by the same amount is performed once. Or by performing several times, the resonance frequency f
o is gradually decreased and adjusted to the target frequency.
【００４２】さて、上記実施例は、１点給電式の円偏波
マイクロストリップアンテナの放射導体２に周波数調整
用の突起２２ａ〜２２ｄ又は切欠２３ａ〜２３ｄを設け
たものであるが、２点給電式の円偏波マイクロストリッ
プアンテナの放射導体２に周波数調整用の突起２２ａ〜
２２ｄ又は切欠２３ａ〜２３ｄを設けても同様の効果を
得ることができる。In the above embodiment, the radiation conductor 2 of the one-point feeding type circularly polarized microstrip antenna is provided with the projections 22a to 22d or notches 23a to 23d for frequency adjustment. Projections 22a to 22e for frequency adjustment
The same effect can be obtained by providing 22d or notches 23a to 23d.
【００４３】図５は、周波数調整用の突起２２ａ〜２２
ｄが形成された２点給電式の円偏波マイクロストリップ
アンテナの放射導体２を示したものである。FIG. 5 shows projections 22a-22 for frequency adjustment.
FIG. 3 shows a radiation conductor 2 of a two-point feeding type circularly polarized microstrip antenna in which d is formed.
【００４４】円形の放射導体２の中心Ｏで直交する直線
ｍ，ｎ上であって、該放射導体２の適所に第１の給電点
Ｐ１と第２の給電点Ｐ２とが偏心させて設けられ、放射
導体２の外周縁端部であって、前記中心Ｏと上記第１の
給電点Ｐ１とを結ぶ方向に対して０°及び１８０°の位
置と、前記中心Ｏと上記第２の給電点Ｐ２とを結ぶ方向
に対して０°及び１８０°の位置とに周波数調整用の突
起２２ａ〜２２ｄが形成されている。A first feeding point P1 and a second feeding point P2 are eccentrically provided on straight lines m and n orthogonal to each other at the center O of the circular radiation conductor 2 and at appropriate positions of the radiation conductor 2. A position at 0 ° and 180 ° with respect to a direction connecting the center O and the first feeding point P1 at an outer peripheral end of the radiation conductor 2, and the center O and the second feeding point. Protrusions 22a to 22d for frequency adjustment are formed at 0 ° and 180 ° with respect to the direction connecting P2.
【００４５】図６は、周波数調整用の切欠２３ａ〜２３
ｄが形成された２点給電式の円偏波マイクロストリップ
アンテナの放射導体２を示したもので、図５に示す放射
導体２の突起２２ａ〜２２ｄに代えて切欠２３ａ〜２３
ｄを形成したものである。FIG. 6 shows notches 23a to 23 for frequency adjustment.
FIG. 5 shows a radiation conductor 2 of a two-point feeding type circularly polarized microstrip antenna formed with d. Notches 23a to 23d instead of the projections 22a to 22d of the radiation conductor 2 shown in FIG.
d is formed.
【００４６】なお、上記実施例では、放射導体２の外周
縁端部の上記特定の位置にそれぞれ１個ずつ突起２２ａ
〜２２ｄ又は切欠２３ａ〜２３ｄを設けていたが、それ
ぞれ２個以上の突起２２ａ〜２２ｄ又は切欠２３ａ〜２
３ｄを設けるようにしてもよい。In the above-described embodiment, one projection 22a is provided at each of the specific positions on the outer peripheral edge of the radiation conductor 2.
22d or notches 23a to 23d, but two or more projections 22a to 22d or notches 23a to 2
3d may be provided.
【００４７】また、円形に限らず、方形その他の任意の
形状を有する放射導体２の外周縁端部の上記特定の位置
に上記周波数調整用の突起２２ａ〜２２ｄ又は切欠２３
ａ〜２３ｄを形成してもよい。The projections 22a to 22d or the notches 23 for adjusting the frequency are provided at the specific positions on the outer peripheral edge of the radiating conductor 2 having not only a circular shape but also a square shape or any other shape.
a to 23d may be formed.
【００４８】[0048]
【発明の効果】以上説明したように、本発明によれば、
誘電体基板の表裏面に接地導体と放射導体とを形成して
なる１点給電式の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１又は２以上の共振周波数
を上昇方向に調整するための突起を形成したので、該突
起を切削し、その長さを短くすることにより円偏波の軸
比や指向性や入力インピーダンス等の他の特性に影響を
与えることなく共振周波数を上昇させて簡単に目標値に
調整することができる。As described above, according to the present invention,
In a one-point feeding type circularly polarized microstrip antenna having a ground conductor and a radiating conductor formed on the front and back surfaces of a dielectric substrate, an outer peripheral edge of the radiating conductor, the radiating conductor center and a feeding point, Are formed at positions in the direction of 90 N ° (N is an integer) with respect to the direction connecting the two directions, so that one or two or more resonance frequencies are adjusted in the ascending direction. By doing so, the resonance frequency can be increased and easily adjusted to the target value without affecting other characteristics such as the axial ratio, the directivity, and the input impedance of the circularly polarized wave.
【００４９】また、上記周波数調整用の突起に代えて共
振周波数を低下方向に調整するための切欠を形成したの
で、該切欠を切削し、その長さを長くすることにより円
偏波の軸比や指向性や入力インピーダンス等の他の特性
に影響を与えることなく共振周波数を低下させて簡単に
目標値に調整することができる。In addition, a notch for adjusting the resonance frequency in a decreasing direction is formed in place of the frequency adjusting protrusion, and the notch is cut and the length thereof is increased to thereby increase the axial ratio of the circularly polarized wave. The resonance frequency can be reduced and the target value can be easily adjusted without affecting other characteristics such as directivity, input impedance, and the like.
【００５０】また、誘電体基板の表裏面に接地導体と放
射導体とを形成してなる２点給電式の円偏波マイクロス
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第１の給電点とを結ぶ方向に対
して０°及び１８０°の位置及び放射導体中心と第２の
給電点とを結ぶ方向に対して０°及び１８０°の位置に
それぞれ１又は２以上の周波数調整用の突起を成形した
ので、上記と同様に円偏波の軸比や指向性や入力インピ
ーダンス等の他の特性に影響を与えることなく共振周波
数を上昇させて簡単に目標値に調整することができる。In a two-point feeding type circularly polarized microstrip antenna having a ground conductor and a radiating conductor formed on the front and back surfaces of a dielectric substrate, an outer peripheral edge of the radiating conductor and a center of the radiating conductor are provided. 1 and 2 or more at positions of 0 ° and 180 ° with respect to the direction connecting the radiating conductor and the second feeding point with respect to the direction connecting the radiating conductor center and the second feeding point. Having formed the collision force for adjusting the frequency of the easily targeted by the upper temperature the resonant frequency without affecting the other properties, such as the axial ratio and the directivity or input impedance of the circular polarization in the same manner as described above Value can be adjusted.
【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 circularly polarized 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 line AA ′ of FIG.
【図３】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. 3 is a view showing a shape of a radiation conductor of a circularly polarized microstrip antenna according to a second embodiment of the present invention.
【図４】周波数調整用の突起又は切欠の長さに対する周
波数の変化量を示す図である。FIG. 4 is a diagram illustrating a change amount of a frequency with respect to a length of a protrusion or a notch for frequency adjustment.
【図５】本発明に係る円偏波マイクロストリップアンテ
ナの第３実施例の放射導体の形状を示す図である。FIG. 5 is a view showing a shape of a radiation conductor of a third embodiment of the circularly polarized microstrip antenna according to the present invention.
【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４実施例の放射導体の形状を示す図である。FIG. 6 is a view showing the shape of a radiation conductor of a fourth 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 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，２２ａ〜２２ｄ 突起 ２３ａ〜２３ｄ 切欠 Ｐ 給電点 DESCRIPTION OF SYMBOLS 1 Circularly polarized microstrip antenna 2 Radiation conductor 3 Ground conductor 4 Dielectric substrate 5 Coaxial cable for power supply 21a-21d, 22a-22d Projection 23a-23d Notch P Feed point
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−33905（ＪＰ，Ａ) 特開 平３−80603（ＪＰ，Ａ) 特開 昭58−141006（ＪＰ，Ａ) 特開 平２−48803（ＪＰ，Ａ) 伊藤、他、「深いノッチを装荷した小 型マイクロストリップアンテナの実験」 （昭和63年電子情報通信学会秋季全国大 会Ｂ−32) (58)調査した分野(Int.Cl.6，ＤＢ名) H01Q 13/08 H01Q 21/24──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-33905 (JP, A) JP-A-3-80603 (JP, A) JP-A-58-141006 (JP, A) JP-A-2- 48803 (JP, A) Ito et al., “Experiment of small microstrip antenna loaded with deep notch” (IEICE Autumn Meeting 1988, B-32) (58) Fields studied (Int. Cl) . 6 , DB name) H01Q 13/08 H01Q 21/24
Claims (3)
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、放射導体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
れ共振周波数を上昇方向に調整するための１又は２以上
の突起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 ground conductor is formed on one surface of a dielectric substrate and a radiation conductor is formed on the other surface, and a feeding point is provided eccentrically to the radiation conductor. In the antenna, the radiation conductor is an outer peripheral edge thereof, and the axial ratio is adjusted to a position of 45 × (2N + 1) ° (N is an integer) with respect to a direction connecting the radiation conductor center and the feeding point. And one or more projections for adjusting the resonance frequency in the ascending direction at 90 N ° (N is an integer). Wave microstrip antenna.
プアンテナにおいて、放射導体は、周波数調整用の突起
に代えて共振周波数を低下方向に調整するための切欠が
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。2. The circularly polarized microstrip antenna according to claim 1, wherein the radiation conductor is formed with a notch for adjusting the resonance frequency in a decreasing direction instead of the frequency adjustment projection. Circularly polarized microstrip antenna.
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第１の給電点と第２の給電点
とにそれぞれ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、放射導体中心と上記第１の給電点とを結ぶ方向に対
して０°及び１８０°の位置及び放射導体中心と上記第
２の給電点とを結ぶ方向に対して０°及び１８０°の位
置にそれぞれ共振周波数を上昇方向に調整するための１
又は２以上の突起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。3. A grounding conductor is formed on one surface of a dielectric substrate, and a radiating conductor is formed on the other surface. A first feeding point and a second feeding point provided eccentrically on the radiating conductor. , Respectively, wherein the radiation conductor is an outer peripheral edge thereof, and is 0 ° and 180 ° with respect to a direction connecting the center of the radiation conductor and the first feed point. 1 for adjusting the resonance frequency in the ascending direction at a position of 0 ° and at a position of 0 ° and 180 ° with respect to the direction connecting the center of the radiation conductor and the second feed point, respectively.
Alternatively, a circularly polarized microstrip antenna, wherein two or more projections are formed.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3190167A JP2852377B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna |
| EP97121860A EP0836241B1 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized wave microstrip antenna and frequency adjusting method therefor |
| 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 |
| DE69232020T DE69232020T2 (en) | 1991-07-30 | 1992-07-28 | Circularly polarized stripline antenna and method for its frequency adjustment |
| 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 |
|---|---|---|---|
| JP3190167A JP2852377B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0537228A JPH0537228A (en) | 1993-02-12 |
| JP2852377B2 true JP2852377B2 (en) | 1999-02-03 |
Family
ID=16253552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3190167A Expired - Lifetime JP2852377B2 (en) | 1991-07-30 | 1991-07-30 | Circularly polarized microstrip antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2852377B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080043480A (en) * | 2006-11-14 | 2008-05-19 | (주) 큐알온텍 | Method for manufacturing microstrip patch antena |
| JP2008236362A (en) * | 2007-03-20 | 2008-10-02 | Ngk Spark Plug Co Ltd | Patch antenna and its characteristic adjusting method |
Family Cites Families (2)
| 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 |
| JPH088446B2 (en) * | 1989-08-23 | 1996-01-29 | 株式会社村田製作所 | Microstrip antenna |
-
1991
- 1991-07-30 JP JP3190167A patent/JP2852377B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 伊藤、他、「深いノッチを装荷した小型マイクロストリップアンテナの実験」（昭和６３年電子情報通信学会秋季全国大会Ｂ−３２） |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0537228A (en) | 1993-02-12 |
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