JP3262387B2 - Spiral antenna - Google Patents
Spiral antennaInfo
- Publication number
- JP3262387B2 JP3262387B2 JP29285692A JP29285692A JP3262387B2 JP 3262387 B2 JP3262387 B2 JP 3262387B2 JP 29285692 A JP29285692 A JP 29285692A JP 29285692 A JP29285692 A JP 29285692A JP 3262387 B2 JP3262387 B2 JP 3262387B2
- Authority
- JP
- Japan
- Prior art keywords
- annular member
- dielectric substrate
- dielectric
- spiral antenna
- radiating element
- 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 - Fee Related
Links
Landscapes
- Details Of Aerials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、渦巻アンテナに関し、
特に、広い放射指向特性を有する渦巻アンテナに関す
る。BACKGROUND OF THE INVENTION The present invention relates to a spiral antenna.
In particular, it relates to a spiral antenna having a wide radiation directivity characteristic.
【０００２】[0002]
【従来の技術】従来、この種の渦巻アンテナとしては、
例えば図５の一部断面した斜視図に示すものがある。同
図において、渦巻アンテナ１は、表面に渦巻状の放射素
子２ａ，２ｂが形成された誘電体基板３を、中空の円筒
部材４の開口部に載置し、該誘電体基板３の外周縁を、
その半径方向で、前記誘電体基板３の放射素子形成面と
垂直な断面がＬ字状の損失性誘電体から成る接着環状部
材５により、前記誘電体基板３を前記中空の円筒部材４
に接着、結合させていた。2. Description of the Related Art Conventionally, as this kind of spiral antenna,
For example, there is one shown in a partially sectional perspective view of FIG. Referring to FIG. 1, a spiral antenna 1 includes a dielectric substrate 3 having spiral radiating elements 2a and 2b formed on a surface thereof, and a hollow cylinder.
It is placed on the opening of the member 4 and the outer peripheral edge of the dielectric substrate 3 is
In the radial direction, the radiating element forming surface of the dielectric substrate 3 is
By bonding the annular portion <br/> member 5 section perpendicular Ru consists L-shaped lossy dielectric, the dielectric substrate 3 the hollow cylindrical member 4
Was bonded and bonded.
【０００３】前記誘電体基板３を前記中空の円筒部材４
に結合するに際し、前記誘電体基板３の外周縁部と前記
接着環状部材５との接合面に電波吸収材６を塗布し、該
基板３上の渦巻状の放射素子２ａ，２ｂを流れる電流を
該放射素子２ａ，２ｂの端部で吸収させている。[0003] The dielectric substrate 3 is connected to the hollow cylindrical member 4.
When bonding to the substrate, a radio wave absorbing material 6 is applied to the joint surface between the outer peripheral edge of the dielectric substrate 3 and the adhesive annular member 5, and the current flowing through the spiral radiating elements 2a and 2b on the substrate 3 is reduced. The light is absorbed at the ends of the radiating elements 2a and 2b.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前述の
ような従来の渦巻アンテナ１にあっては、所要の放射指
向特性を得るために、その特性を大きく変化させること
は困難であった。However, in the conventional spiral antenna 1 as described above, it is difficult to largely change the characteristics in order to obtain required radiation directivity characteristics.
【０００５】すなわち、前記渦巻アンテナ１の放射指向
特性は、その放射素子２ａ，２ｂを流れる電流の自己調
整作用により、強い放射の生ずる位置が、自動的に決定
されてしまうため、通常の放射指向特性以外の特性、特
に、より広い放射指向特性が要求される分野には適用で
きないという問題点があった。In other words, the radiation directivity of the spiral antenna 1 is determined by the self-adjustment effect of the current flowing through the radiation elements 2a and 2b. There is a problem that it cannot be applied to characteristics other than the characteristics, particularly, to a field where a wider radiation directivity characteristic is required.
【０００６】本発明はかかる点に鑑みなされたもので、
その目的は前記問題点を解消し、より広い放射指向特性
が得られるような渦巻アンテナを提供することにある。[0006] The present invention has been made in view of such a point,
An object of the present invention is to solve the above-mentioned problem and to provide a spiral antenna capable of obtaining a wider radiation directivity characteristic.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
の本発明の構成は、渦巻状の放射素子が形成される誘電
体基板を、中空の円筒部材に結合するため、該誘電体基
板の外縁部を、電波吸収材を介して環状部材により、前
記中空の円筒部材に固着する渦巻アンテナにおいて、次
のとおりある。Means for Solving the Problems The configuration of the present invention for achieving the above object, a dielectric substrate spiral radiating element Ru is formed, for coupling to a hollow cylindrical member, the dielectric substrate The spiral antenna in which the outer edge is fixed to the hollow cylindrical member by an annular member via a radio wave absorbing material is as follows.
【０００８】前記環状部材は、その半径方向で、前記誘
電体基板の放射素子形成面と垂直な断面が、結合される
前記誘電体基板及び前記中空の円筒部材が占める中心角
が約９０度の範囲の切り欠きを有するほぼ円形状又はほ
ぼ楕円形状の誘電体から成り、前記放射素子に該環状部
材を装荷させる渦巻アンテナである。 [0008] The annular member, in its radial direction, the guide
The cross section perpendicular to the radiating element forming surface of the electronic substrate is joined
Central angle occupied by the dielectric substrate and the hollow cylindrical member
Have a substantially circular or approximately circular shape with a notch
Pot a dielectric elliptical, a spiral antenna Ru is loaded with the annulus <br/> material to the radiating element.
【０００９】また、前記環状部材は、その半径方向で、
前記誘電体基板の放射素子形成面と垂直な断面が、Ｌ字
状の誘電体から成るとともに、該環状部材の外側に、そ
の半径方向で、前記誘電体基板の放射素子形成面と垂直
な断面が、固着される前記環状部材が占める中心角が約
９０度の範囲の切り欠きを有するほぼ円形状又はほぼ楕
円形状の誘電体から成る外側環状部材を固着し、前記放
射素子に該外側環状部材を装荷させる渦巻アンテナであ
る。 [0009] Further , the annular member has a radial direction,
The cross section perpendicular to the radiating element forming surface of the dielectric substrate is L-shaped.
And an outer surface of the annular member.
In the radial direction, perpendicular to the radiating element forming surface of the dielectric substrate.
The central angle occupied by the annular member to be fixed is approximately
Almost circular or elliptical with cutouts in the range of 90 degrees
An outer annular member made of a circular dielectric is fixed to the outer annular member.
A spiral antenna for loading the outer annular member on the radiation element.
You.
【００１０】[0010]
【作用】[Action]
前記のように構成される渦巻アンテナは、前記The spiral antenna configured as described above,
環状部材、又は前記外側環状部材の、半径方向で、前記In the radial direction of the annular member or the outer annular member,
誘電体基板の放射素子形成面と垂直な断面の形状、大きShape and size of the cross section perpendicular to the radiating element formation surface of the dielectric substrate
さ及びその誘電率を選択することにより、その放射指向By selecting its dielectric constant and its radiation permittivity
特性を大きく変化させ、かつ所要の広い放射指向特性をCharacteristics and greatly change the required radiation pattern.
得ることができる。Obtainable.
【００１１】[0011]
【実施例】以下、図面に基づいて本発明の好適な実施例DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to the drawings.
を例示的に詳しく説明する。Will be described in detail by way of example.
【００１２】（第１実施例）図１は、本発明の渦巻アン
テナの第１実施例を示す一部断面した斜視図で、図５と
同一部材には同一符号を付してその説明を省略する。 (First Embodiment) FIG.
FIG. 5 is a partially sectional perspective view showing the first embodiment of the tena.
The same members are denoted by the same reference numerals and description thereof will be omitted.
【００１３】図１において、渦巻アンテナ１１は、図５
に示す接着環状部材５に代えて、半径方向で、前記誘電
体基板３の放射素子形成面と垂直な断面が、結合される
前記誘電体基板３及び前記中空の円筒部材４が占める中
心角が約９０度の範囲の切り欠きを有するほぼ円形状の
誘電体から成る環状部材１２により、前記誘電体基板３
の外周縁部を前記中空の円筒部材４に結合させるととも
に、渦巻状の放射素子 ２ａ，２ｂに前記環状部材１２を
装荷させている。 In FIG . 1, a spiral antenna 11 is shown in FIG.
In place of the adhesive annular member 5 shown in FIG.
A cross section perpendicular to the radiating element forming surface of the body substrate 3 is joined.
When the dielectric substrate 3 and the hollow cylindrical member 4 occupy
A substantially circular shape with a notch with a center angle of about 90 degrees
The dielectric substrate 3 is formed by the annular member 12 made of a dielectric.
Is connected to the hollow cylindrical member 4.
Then, the annular member 12 is attached to the spiral radiating elements 2a and 2b.
Loading.
【００１４】この環状部材１２の前記断面は前記ほぼ円
形状に限らず、その対応する形状がほぼ楕円形状又は多
角形状でもよく、かつ結合される前記誘電体基板３及び
前記中空の円筒部材４が占める中心角が約９０度の範囲
を切り欠いている。The cross section of the annular member 12 is substantially circular.
Not only the shape but also the corresponding shape may be substantially elliptical or polygonal, and the dielectric substrates 3 and
The central angle occupied by the hollow cylindrical member 4 is cut out in a range of about 90 degrees.
【００１５】前記渦巻アンテナ１１の放射素子２ａ，２
ｂから放射される電波は、前記環状部材１２内を通過す
る領域（広角域）と、通過しない領域（正面域）とに分
けることができる。Radiating elements 2a, 2 of spiral antenna 11
radio wave radiated from the b includes a region that passes through the ring-shaped member 12 (wide area), it can be divided into a region which does not pass (front area).
【００１６】前記電波が前記環状部材１２内を通過する
領域では、該環状部材１２の誘電体による波長短縮作
用、誘電体表面での反射、屈折作用及び誘電体内部での
反射、屈折作用が生ずる。[0016] In areas where the radio wave passes through the ring-shaped member 12, the wavelength shortening effect by the dielectric of the annular member 12, reflected at the dielectric surface, the refractive effect and dielectric reflection inside, the refracting action Occurs.
【００１７】これらの作用から、前記渦巻アンテナ１１
の開口面の電磁界分布を広角域で変化させ、結果として
遠方界が広い放射指向特性を持たせる。又、前記環状部
材１２の前記断面形状、大きさ及び誘電体の誘電率を変
化させて、前記渦巻アンテナ１１の開口面の電磁界分布
を変化させ、結果として放射指向特性も変化させること
ができる。From these actions, the spiral antenna 11
The electromagnetic field distribution on the opening surface of the first lens is changed in a wide angle range, and as a result, the far field has a wide radiation directivity characteristic. Further, the sectional shape of the ring-shaped portion <br/> member 12, by changing the dielectric constant of the size and the dielectric, changing the electromagnetic field distribution of the open face of the spiral antenna 11, resulting in radiation patterns Can also be changed.
【００１８】（第２実施例）図２は、本発明の第２実施
例を示す一部断面した斜視図で、図１の変形例である。
図２において、渦巻アンテナ２１の環状部材２２は誘電
体から成り、その半径方向で、前記誘電体基板３の放射
素子形成面と垂直な断面形状は、図１に示される前記環
状部材１２の一部変形で、その内側の円弧の一点から引
いた接線２２ａと、前記誘電体基板３の面とで形成され
る部分２２ｂが付加され、前記誘電体基板３との接合面
が、該誘電体基板３に固着される。[0018] (Second Embodiment) FIG 2 is a perspective view partially sectioned and showing a second embodiment of the present invention is a modification of FIG.
2, the ring-shaped member 22 of the spiral antenna 21 is a dielectric, in the radial direction, the radiation of the dielectric substrate 3
The cross-sectional shape perpendicular to the element formation surface, the ring shown in Figure 1
In some variations of Jo member 12, formed by the tangent 22a drawn from a point of the arc of the inner, and the dielectric substrate 3 surface
A portion 22 b is added, and the bonding surface with the dielectric substrate 3 is fixed to the dielectric substrate 3.
【００１９】このような環状部材２２を、前記放射素子
２ａ，２ｂに装荷させるので、前記環状部材２２の前記
付加される部分２２ｂの形状及び大きさにより、前記渦
巻ア ンテナ２１の放射指向特性を、所要の指向特性に調
整することができる。 Such an annular member 22 is connected to the radiating element
2a and 2b, so that the annular member 22
Depending on the shape and size of the portion 22b to be added,
Directional characteristics of radiation Makia antenna 21, adjusted to the required directional characteristics
Can be adjusted.
【００２０】（第３実施例）図３は、本発明の第３実施
例を示す一部断面した斜視図で、図５と同一部材には同
一符号を付してその説明を省略する。 (Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
FIG. 5 is a partially sectional perspective view showing an example.
The same reference numerals are given and the description is omitted.
【００２１】図３において、渦巻アンテナ３１は、環状
部材として、従来の渦巻アンテナ１を構成するもので、
その半径方向で、前記誘電体基板３の放射素子形成面と
垂直な断面が、Ｌ字状の誘電体から成る前記接着環状部
材５を有し、この接着環状部材５の外側に、その半径方
向で、前記誘電体基板３の放射素子形成面と垂直な断面
が、固着される前記接着環状部材５が占める中心角が約
９０度の範囲の切り欠きを有するほぼ円形状の誘電体か
ら成る外側環状部材を固着するとともに、前記放射素子
２ａ，２ｂに該外側環状部材３２を装荷させている。 In FIG . 3, the spiral antenna 31 has an annular shape.
The member constitutes the conventional spiral antenna 1,
In the radial direction, the radiating element forming surface of the dielectric substrate 3 is
The bonding annular portion having a vertical cross section formed of an L-shaped dielectric;
A material 5 is provided on the outside of the adhesive annular member 5 in the radial direction.
Perpendicular to the radiating element forming surface of the dielectric substrate 3
However, the central angle occupied by the bonded annular member 5 to be fixed is about
An almost circular dielectric with a notch in the range of 90 degrees
An outer annular member comprising the radiating element
The outer annular member 32 is loaded on 2a and 2b.
【００２２】前記外側環状部材３２の前記断面は、前記
ほぼ円形状に限らず、その対応する形状がほぼ楕円形状
又は多角形状でもよく、かつ固着される前記接着環状部
材５が占める中心角が約９０度の範囲を切り欠いてい
る。 The cross section of the outer annular member 32 is
Not only a circular shape but the corresponding shape is almost elliptical
Or said adhesive annular portion which may be polygonal and is fixed
The center angle occupied by the material 5 is notched in the range of about 90 degrees.
You.
【００２３】前記渦巻アンテナ３１は、前記外側環状部
材３２の前記断面形状、大きさ及び誘電体の誘電率によ
り、放射指向特性を所要の指向特性に調整することがで
きる。 The spiral antenna 31 includes the outer annular portion.
The cross-sectional shape and size of the material 32 and the dielectric constant of the dielectric.
The radiation directional characteristics can be adjusted to the required directional characteristics.
Wear.
【００２４】図４は、本実施例による渦巻アンテナ３１
と従来の渦巻アンテナ１との各放射指向特性（放射角に
対する放射減衰量を示す）の比較図である。同図から明
らかなように、本実施例の前記外側環状部材３２を装荷
することにより、渦巻アンテナ３１の放射指向特性は、
従来のものに比較して広い放射角にわたり減衰量の変動
が少なく、広い放射指向特性が得られている。 FIG . 4 shows a spiral antenna 31 according to this embodiment.
Radiation directivity characteristics of the conventional spiral antenna 1 and
FIG. 6 is a comparison diagram of (a) shows a radiation attenuation amount. From the same figure
As described above, the outer annular member 32 of the present embodiment is loaded.
By doing so, the radiation directivity characteristics of the spiral antenna 31
Attenuation variation over a wider radiation angle compared to conventional ones
And a wide radiation directivity characteristic is obtained.
【００２５】なお、本発明の技術は前記実施例における
技術に限定されるものではなく、同様な機能を果す他の
態様の手段によってもよく、また本発明の技術は前記構
成の 範囲内において種々の変更、付加が可能である。 The technique of the present invention is the same as that of the above embodiment.
It is not limited to technology, but other functions that perform similar functions
The technique of the present invention may be based on the above-described configuration.
Various changes and additions are possible within the scope of the invention.
【００２６】[0026]
【発明の効果】【The invention's effect】
以上の説明から明らかなように本発明のAs is clear from the above description, the present invention
渦巻アンテナによれば、渦巻状の放射素子が形成されるAccording to the spiral antenna, a spiral radiating element is formed.
誘電体基板を中空の円筒部材に結合するための環状部An annular portion for joining a dielectric substrate to a hollow cylindrical member
材、又は断面Ｌ字状環状部材の外側に固着する外側環状Material or outer ring fixed to the outside of L-shaped annular member
部材は、その半径方向で、誘電体基板の放射素子形成面The member is located in the radial direction on the radiating element forming surface of the dielectric substrate.
と垂直な断面が、結合される前記誘電体基板及び前記中A cross section perpendicular to the dielectric substrate and the
空の円筒部材、又は前記断面Ｌ字状環状部材が占める中Empty cylindrical member or inside of the above L-shaped annular member
心角が約９０度の範囲の切り欠きを有するほぼ円形状又A substantially circular shape having a notch with a center angle of about 90 degrees or
はほぼ楕円形状の誘電体から成り、前記放射素子に前記Is composed of a substantially elliptical dielectric, and the radiating element
環状部材又は前記外側環状部材を装荷させるので、前記Because the annular member or the outer annular member is loaded,
環状部材又は前記外側環状部材の前記断面形状、大きさThe cross-sectional shape and size of the annular member or the outer annular member
及びその誘電率を選択することにより、種々のより広いAnd by choosing its dielectric constant
放射指向特性を得ることができる。Radiation directivity can be obtained.
【図１】本発明の渦巻アンテナの第１実施例を示す一部
断面した斜視図である。FIG. 1 is a partially sectional perspective view showing a first embodiment of a spiral antenna according to the present invention.
【図２】本発明の第２実施例を示す一部断面した斜視図
である。FIG. 2 is a partially sectional perspective view showing a second embodiment of the present invention.
【図３】本発明の第３実施例を示す一部断面した斜視図
である。FIG. 3 is a partially sectional perspective view showing a third embodiment of the present invention.
【図４】第３実施例による渦巻アンテナ３１と、従来の
渦巻アンテナ１との各放射指向特性(放射角に対する放
射減衰量を示す)の比較図である。FIG. 4 is a comparison diagram of radiation directivity characteristics (showing radiation attenuation with respect to a radiation angle) between the spiral antenna 31 according to the third embodiment and the conventional spiral antenna 1;
【図５】従来の渦巻アンテナを示す一部断面した斜視図
である。FIG. 5 is a partially sectional perspective view showing a conventional spiral antenna.
１，１１，２１，３１ 渦巻アンテナ ２ａ，２ｂ 放射素子 ３ 誘電体基板 ４ 中空の円筒部材 ５ 接着環状部材 ６ 電波吸収材 １２，２２ 環状部材 ３２ 外側環状部材1, 11, 21, 31 spiral antenna 2a, 2b radiating element 3 dielectric substrate 4 hollow cylindrical member 5 adhered annular member 6 radio wave absorbing member 12, 22 rings like member 32 the outer ring-shaped member
Claims (2)
板を、中空の円筒部材に結合するため、該誘電体基板の
外縁部を、電波吸収材を介して環状部材により、前記中
空の円筒部材に固着する渦巻アンテナにおいて、前記環状部材は、その半径方向で、前記誘電体基板の放
射素子形成面と垂直な断面が、結合される前記誘電体基
板及び前記中空の円筒部材が占める中心角が約９０度の
範囲の切り欠きを有するほぼ円形状又はほぼ楕円形状の
誘電体から成り、 前記放射素子に該環状部材を装荷させることを特徴とす
る渦巻アンテナ。1. A dielectric substrate spiral radiating element Ru is formed, for coupling to a hollow cylindrical member, the outer edge of the dielectric substrate, the annular member through the radio wave absorbing member, wherein during
In a spiral antenna fixed to an empty cylindrical member , the annular member has a radial direction in which the dielectric substrate extends.
A cross section perpendicular to the surface on which the projection element is formed,
The central angle occupied by the plate and the hollow cylindrical member is about 90 degrees.
Almost circular or almost elliptical with notches in the range
A dielectric, a spiral antenna, characterized in that Ru is loaded with the annular member to said radiating element.
板を、中空の円筒部材に結合するため、該誘電体基板の
外縁部を、電波吸収材を介して環状部材により、前記中
空の円筒部材に固着する渦巻アンテナにおいて、 前記環状部材は、その半径方向で、前記誘電体基板の放
射素子形成面と垂直な断面が、Ｌ字状の誘電体から成る
とともに、該環状部材の外側に、その半径方向で、前記
誘電体基板の放射素子形成面と垂直な断面が、固着され
る前記環状部材が占める中心角が約９０度の範囲の切り
欠きを有するほぼ円形状又はほぼ楕円形状の誘電体から
成る外側環状部材を固着し、 前記放射素子に該外側環状部材を装荷させることを特徴
とする渦巻アンテナ。 2. A dielectric substrate on which a spiral radiating element is formed.
In order to connect the plate to the hollow cylindrical member, the dielectric substrate
The outer edge portion is formed by an annular member through a radio wave absorbing material.
In a spiral antenna fixed to an empty cylindrical member, the annular member has a radial direction in which the dielectric substrate extends.
The cross section perpendicular to the projection element forming surface is made of an L-shaped dielectric.
With the outside of the annular member, in its radial direction,
The cross section perpendicular to the radiating element formation surface of the dielectric substrate is
The central angle occupied by the annular member is approximately 90 degrees.
From a substantially circular or almost elliptical dielectric with a notch
And fixing the outer annular member to the radiating element.
And a spiral antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29285692A JP3262387B2 (en) | 1992-10-30 | 1992-10-30 | Spiral antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29285692A JP3262387B2 (en) | 1992-10-30 | 1992-10-30 | Spiral antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06152225A JPH06152225A (en) | 1994-05-31 |
| JP3262387B2 true JP3262387B2 (en) | 2002-03-04 |
Family
ID=17787259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29285692A Expired - Fee Related JP3262387B2 (en) | 1992-10-30 | 1992-10-30 | Spiral antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3262387B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011211420A (en) * | 2010-03-29 | 2011-10-20 | Toshiba Corp | Spiral antenna |
| JP5496941B2 (en) * | 2011-03-25 | 2014-05-21 | 東芝電波プロダクツ株式会社 | Spiral antenna |
-
1992
- 1992-10-30 JP JP29285692A patent/JP3262387B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06152225A (en) | 1994-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0227121B1 (en) | Horn antenna with a choke surface-wave structure on the outer surface thereof | |
| US5900847A (en) | Dielectric lens apparatus | |
| US6522305B2 (en) | Microwave antennas | |
| JP5679820B2 (en) | Subreflector of double reflector antenna | |
| JPH06197394A (en) | Reflection type speaker system | |
| CA2023544A1 (en) | Planar slotted antenna with radial line | |
| JPH09321533A (en) | Lens antenna | |
| GB2307356A (en) | Coupled line element | |
| JP3422268B2 (en) | Dielectric lens antenna and wireless device using the same | |
| KR100414248B1 (en) | Antennas for blood dome, primary radiator and microwave | |
| JP3262387B2 (en) | Spiral antenna | |
| JPS6035844B2 (en) | antenna | |
| CN111653873A (en) | Antenna structure | |
| JP3384353B2 (en) | Antenna device | |
| JPH02301201A (en) | Radome | |
| JP2002368479A (en) | Electromagnetic wave shielding material | |
| JP2005295480A (en) | Dielectric lens antenna using inclination refractive index material and multi-layer reflecting mirror | |
| US11424546B2 (en) | Modified ground planes to increase gains in element patterns of geodesic antennas | |
| JP2002353723A (en) | Parabolic antenna with radome | |
| JPH02209003A (en) | Antenna system | |
| JPS59219001A (en) | Transceiver using microwave integrated circuit | |
| JP3376200B2 (en) | Double reflector parabolic antenna device | |
| JPS6367003A (en) | Double mode horn | |
| JPS604605B2 (en) | Reflector antenna device | |
| JPS5834602A (en) | Wave absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |