JPH035085B2 - - Google Patents
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- Publication number
- JPH035085B2 JPH035085B2 JP29077785A JP29077785A JPH035085B2 JP H035085 B2 JPH035085 B2 JP H035085B2 JP 29077785 A JP29077785 A JP 29077785A JP 29077785 A JP29077785 A JP 29077785A JP H035085 B2 JPH035085 B2 JP H035085B2
- Authority
- JP
- Japan
- Prior art keywords
- horn
- electromagnetic
- electromagnetic horn
- opening
- central axis
- 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
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- 239000004020 conductor Substances 0.000 claims description 37
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 21
- 230000000694 effects Effects 0.000 description 7
- 230000005672 electromagnetic field Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000005388 cross polarization Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Landscapes
- Aerials With Secondary Devices (AREA)
- Waveguide Aerials (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は無線通信、特にマイクロ波帯無線通信
で多く用いられる電磁ホーンに関し、特にパラボ
ラアンテナの一次放射器として用いられる比較的
小口径の電磁ホーンに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electromagnetic horn that is often used in wireless communication, particularly microwave band wireless communication, and particularly relates to an electromagnetic horn of relatively small diameter used as a primary radiator of a parabolic antenna. Regarding the horn.
従来、この種の電磁ホーンとしては第１０図
ａ，ｂに示すような構成のいわゆるオープンコル
ゲートホーンが用いられてきた（例えば、米国特
許第3212096号）。この電磁ホーン１は、ホーン開
口部２寄りのホーン外壁に輪郭が円形の導体板１
０１を設け、この導体板１０１の一方の面、すな
わちホーン開口部２側の面には同心状に複数のフ
イン１０２を設けている。このようにして、各フ
インの間には環状の導体溝１０３が形成される。
しかも、導体溝１０３の底部は電磁ホーン１の中
心軸に対して直交する面となるようにされてい
る。
Conventionally, as this type of electromagnetic horn, a so-called open corrugated horn having a configuration as shown in FIGS. 10a and 10b has been used (for example, US Pat. No. 3,212,096). This electromagnetic horn 1 has a conductor plate 1 with a circular outline on the outer wall of the horn near the horn opening 2.
01, and a plurality of fins 102 are provided concentrically on one surface of the conductor plate 101, that is, the surface on the horn opening 2 side. In this way, an annular conductor groove 103 is formed between each fin.
Moreover, the bottom of the conductor groove 103 is arranged to be a plane perpendicular to the central axis of the electromagnetic horn 1.
この電磁ホーンでは、円形ホーン３を伝播して
きた電磁波がホーン開口部２より空間に放射され
る。従つて、ホーン開口部２からの放射特性は円
形導波管の伝播モードに従つたものとなる。一般
的には伝播モードとして基本モードのTE11モー
ドが用いられ、このモードの電磁界分布がホーン
中心軸に関して回転対称で無い為に放射特性もホ
ーン中心軸に関して非対称なものとなる。そのた
め、例えばこれをパラボラアンテナの一次放射器
として用いた場合に照射効率の低下や交差偏波の
劣化の原因となる。 In this electromagnetic horn, electromagnetic waves propagated through the circular horn 3 are radiated into space from the horn opening 2. Therefore, the radiation characteristics from the horn opening 2 follow the propagation mode of the circular waveguide. Generally, the fundamental mode TE 11 mode is used as the propagation mode, and since the electromagnetic field distribution of this mode is not rotationally symmetrical with respect to the central axis of the horn, the radiation characteristics are also asymmetrical with respect to the central axis of the horn. Therefore, for example, when this is used as a primary radiator of a parabolic antenna, it causes a decrease in irradiation efficiency and deterioration of cross-polarized waves.
第１０図で導体溝１０３はその深さが使用周波
数の波長の約1/4であり、いわゆるチヨーク構造
となつている。従つて、放射特性はホーン開口部
２とこの開口部からの放射波により励振される導
体溝１０３の電磁界分布により定まる。この際、
導体溝がいわゆるチヨーク構造となつているた
め、円形導波管内の境界条件の制約が導体溝では
無い。このため、導体溝をも含めた全体の電磁界
分布は円形ホーン単体の場合に比較して回転対称
に近い放射特性が得られ、同時に円形ホーン外壁
上の不要誘起電流をも導体溝の直径Ｄを大きくと
ることにより抑制できるため低サイドローブとな
る。 In FIG. 10, the depth of the conductor groove 103 is approximately 1/4 of the wavelength of the frequency used, and has a so-called chioke structure. Therefore, the radiation characteristics are determined by the electromagnetic field distribution of the horn opening 2 and the conductor groove 103 excited by the radiation waves from this opening. On this occasion,
Since the conductor groove has a so-called chiyoke structure, the boundary conditions within the circular waveguide are not restricted by the conductor groove. Therefore, the overall electromagnetic field distribution including the conductor groove has a radiation characteristic that is close to rotational symmetry compared to the case of a single circular horn, and at the same time, unnecessary induced current on the outer wall of the circular horn can be reduced by the diameter of the conductor groove. This can be suppressed by increasing the value of , resulting in low sidelobes.
［発明が解決しようとする問題点］
しかしながら、前記特徴を得るためには電磁溝
の直径Ｄを大きくしなければならない。直径Ｄが
大きくなると、第１１図ａ，ｂに示すようなパラ
ボラアンテナ４の一次放射器として用いた場合、
利得低下及びサイドローブレベルの劣化をまねく
という欠点があつた。[Problems to be Solved by the Invention] However, in order to obtain the above characteristics, the diameter D of the electromagnetic groove must be increased. When the diameter D increases, when used as the primary radiator of the parabolic antenna 4 as shown in FIGS. 11a and 11b,
This method has the drawbacks of lowering the gain and deteriorating the sidelobe level.
［問題点を解決するための手段］
本発明の第１の発明によれば、電磁波の送受信
を行う為の開口部を有する電磁ホーンにおいて、
前記電磁ホーンの外壁に、該電磁ホーンの中心軸
方向に間隔をおいてフインを複数個設けることに
より、使用周波数の約1/4波長の深さを有する導
体溝を該電磁ホーンの周方向に設け、かつ該導体
溝の底部が前記中心軸にほぼ平行になるようにし
たことを特徴とする電磁ホーンが得られる。[Means for Solving the Problems] According to the first aspect of the present invention, an electromagnetic horn having an opening for transmitting and receiving electromagnetic waves,
By providing a plurality of fins on the outer wall of the electromagnetic horn at intervals in the direction of the central axis of the electromagnetic horn, a conductor groove having a depth of approximately 1/4 wavelength of the operating frequency is formed in the circumferential direction of the electromagnetic horn. There is obtained an electromagnetic horn characterized in that the bottom of the conductor groove is substantially parallel to the central axis.
本発明の第２の発明によれば電磁ホーンの外壁
に、該電磁ホーンの中心軸方向に間隔をおいてフ
インを複数個設けることにより、使用周波数の約
１／４波長の深さを有する導体溝を該電磁ホーンの
周方向に設け、かつ該導体溝の底部が前記中心軸
にほぼ平行になるようにし、前記複数のフイン
を、前記ホーン開口部に向かつてホーン状に開口
するように前記電磁ホーンに設けた遮蔽筒で内包
するようにしたことを特徴とする電磁ホーンが得
られる。 According to the second aspect of the present invention, by providing a plurality of fins on the outer wall of the electromagnetic horn at intervals in the direction of the central axis of the electromagnetic horn, a conductor having a depth of about 1/4 wavelength of the operating frequency is formed. A groove is provided in the circumferential direction of the electromagnetic horn, the bottom of the conductor groove is substantially parallel to the central axis, and the plurality of fins are opened in a horn shape toward the horn opening. An electromagnetic horn is obtained, which is characterized in that the electromagnetic horn is enclosed in a shielding tube provided in the electromagnetic horn.
［実施例］
第１図ａ，ｂは第１の発明の第１の実施例を示
し、円形ホーン３による電磁ホーン１の外周壁
に、中心軸方向に間隔をおいて輪郭が円形の複数
のフイン１１を設けることにより、２つのフイン
の間に導体溝１２を設けている。導体溝１２の底
部は中心軸と平行になるように設けられる。ま
た、導体溝１２の深さは使用周波数の約1/4波長
である。すなわち、第１０図の従来例に用いられ
ている導体溝はその底部がホーン中心軸と直交す
るように、ホーン中心軸に対して同心円状に複数
個設けられている。これに対し、本発明による導
体溝は、その底部がホーン中心軸に対してほぼ平
行となるように中心軸方向に複数個設けられてい
る為、電磁ホーン全体の直径Ｄを小さくすること
が可能となる。[Embodiment] FIGS. 1a and 1b show a first embodiment of the first invention, in which a plurality of circular contours are provided on the outer peripheral wall of an electromagnetic horn 1 formed by a circular horn 3 at intervals in the central axis direction. By providing the fins 11, a conductor groove 12 is provided between the two fins. The bottom of the conductor groove 12 is provided so as to be parallel to the central axis. Further, the depth of the conductor groove 12 is approximately 1/4 wavelength of the operating frequency. That is, a plurality of conductor grooves used in the conventional example shown in FIG. 10 are provided concentrically with respect to the horn central axis so that the bottoms thereof are perpendicular to the horn central axis. On the other hand, the conductor grooves according to the present invention are provided in multiple numbers in the direction of the central axis of the horn so that their bottoms are approximately parallel to the central axis of the horn, so it is possible to reduce the diameter D of the entire electromagnetic horn. becomes.
電磁波の放射特性について言えば、第１０図に
示した従来例では導体溝の電磁界分布をホーン開
口部２とほぼ平行な面状に分布させて放射特性の
回転対称性を向上し、かつ、導体溝全体の大きさ
により円形ホーンの外壁、すなわち導体溝の背後
への漏洩を物理的に遮断して不要放射を低減して
いる。これに対し、本実施例においては導体溝そ
のものが上記２つの効果を同時に生じるようにし
ている。すなわち、放射特性の回転対称性の向上
については、導体溝の電磁界分布は必ずしもホー
ン開口部２と平行な平面上である必要は無く、ホ
ーンの中心軸回りの円筒面上でも効果があること
を実験的に確認し、かつ、導体溝の深さを使用周
波数の約1/4波長に選定することにより、いわゆ
るチヨーク効果により円形ホーン外壁上に流れる
不要電流による不要放射を低減している。 Regarding the radiation characteristics of electromagnetic waves, in the conventional example shown in FIG. 10, the electromagnetic field distribution of the conductor groove is distributed in a plane substantially parallel to the horn opening 2 to improve the rotational symmetry of the radiation characteristics, and, The overall size of the conductor groove physically blocks leakage to the outer wall of the circular horn, that is, behind the conductor groove, reducing unnecessary radiation. In contrast, in this embodiment, the conductor groove itself produces the above two effects at the same time. In other words, in order to improve the rotational symmetry of the radiation characteristics, the electromagnetic field distribution of the conductor groove does not necessarily have to be on a plane parallel to the horn opening 2, but can also be effective on a cylindrical surface around the central axis of the horn. By experimentally confirming this and selecting the depth of the conductor groove to be approximately 1/4 wavelength of the frequency used, unnecessary radiation due to unnecessary current flowing on the outer wall of the circular horn is reduced due to the so-called Chi-Yoke effect.
第２図は第１図に示した実施例による電磁ホー
ンの放射特性の実測値を示す。円形ホーンの開口
部の直径はほぼ0.7λ（λは使用周波数の波長）、導
体溝の深さはλ/4、溝数は４つの場合である。同
図で実線２１，２３は、いわゆる電界面内の平行
及び交差偏波特性であり、破線２２，２４は、い
わゆる磁界面内の平行及び交差偏波特性である。
第２図に示す放射特性を同一開口寸法を有する円
形ホーンのものと比較すると、平行偏波の回転対
称性で約3dB、交差偏波の値で約5dBの改善とな
つており、本実施例の効果が確認された。 FIG. 2 shows actually measured values of the radiation characteristics of the electromagnetic horn according to the embodiment shown in FIG. The diameter of the opening of the circular horn is approximately 0.7λ (λ is the wavelength of the frequency used), the depth of the conductor groove is λ/4, and the number of grooves is four. In the figure, solid lines 21 and 23 are so-called parallel and cross-polarized wave characteristics within the electric interface, and broken lines 22 and 24 are so-called parallel and cross-polarized wave characteristics within the magnetic interface.
Comparing the radiation characteristics shown in Figure 2 with that of a circular horn with the same aperture size, there is an improvement of approximately 3 dB in the rotational symmetry of parallel polarization and approximately 5 dB in the value of cross polarization. The effect was confirmed.
第３図ａ，ｂは第１の発明の第２の実施例であ
り、外周壁にホーン開口部２側に開口した導体板
３１を設けると共に、導体板３１と中心軸方向に
間隔をおいて複数のフイン３２を設けていること
により、導体溝としてその底部がホーン中心軸と
直交する導体溝３３と平行になる導体溝３４とを
組合せている。第４図はその放射特性の実測値で
ある。第４図に示す放射特性を同一開口寸法を有
し導体溝３３のみのものと比較すると、回転対称
性で約1.5dB、交差偏波の値で約5dBの改善とな
つており、第１図の実施例と同様に本実施例の効
果が確認された。 FIGS. 3a and 3b show a second embodiment of the first invention, in which a conductor plate 31 that is open toward the horn opening 2 side is provided on the outer peripheral wall, and is spaced apart from the conductor plate 31 in the central axis direction. By providing a plurality of fins 32, a conductor groove 34, the bottom of which is parallel to the conductor groove 33 whose bottom part is perpendicular to the horn central axis, is combined. FIG. 4 shows the measured values of the radiation characteristics. Comparing the radiation characteristics shown in Figure 4 with one with the same aperture size and only the conductor groove 33, there is an improvement of approximately 1.5 dB in rotational symmetry and approximately 5 dB in the value of cross polarization, as shown in Figure 1. The effect of this example was confirmed as in Example 2.
第５図ａ，ｂは第１の発明の第３の実施例を示
す。この実施例は、外周壁に設けられるフイン５
１をホーン開口部２側に向かつてホーン状に開く
ように傾斜させたものである。このようにして、
導体溝５２をホーン中心軸に対して傾けることに
より、平行偏波に対する放射特性を回転対称性を
保ちつつ変化させるようにしている。 Figures 5a and 5b show a third embodiment of the first invention. In this embodiment, fins 5 provided on the outer peripheral wall
1 is inclined toward the horn opening 2 side so as to open into a horn shape. In this way,
By tilting the conductor groove 52 with respect to the central axis of the horn, the radiation characteristics for parallel polarized waves can be changed while maintaining rotational symmetry.
第６図ａ，ｂ、第７図ａ，ｂはそれぞれ、第１
の発明の第４、第５図の実施例を示す。第６図
ａ，ｂはホーン形状が方形の場合であり、このた
めフイン６１も輪郭を方形にしている。第７図
ａ，ｂはホーン形状が楕円形の場合であり、フイ
ン７１の輪郭も楕円である。 Figure 6 a, b and Figure 7 a, b are respectively
FIGS. 4 and 5 show embodiments of the invention. FIGS. 6a and 6b show the case where the horn shape is square, and therefore the fin 61 also has a square outline. 7a and 7b show the case where the horn shape is elliptical, and the outline of the fin 71 is also elliptical.
第８図ａ，ｂ、第９図ａ，ｂはそれぞれ、第２
の発明の第６、第７の実施例を示す。これらの実
施例はホーンの背後方向への不要放射を更に低減
させようとするものである。第８図ａ，ｂでは、
第１図に示したのと同様な電磁ホーン１に遮蔽筒
８３を設けたものである。遮蔽筒８３はフイン８
１部分を内包するように、ホーン開口部２側に開
いている。第９図ａ，ｂは第８図に示したのと同
じ遮蔽筒９３の内壁に電波吸収体９４を付設した
ものである。このような遮蔽筒、電波吸収体は第
５図〜第７図の実施例にも適用できることは言う
までも無い。 Figure 8 a, b and Figure 9 a, b are the second
Embodiments 6 and 7 of the invention will be shown. These embodiments are intended to further reduce unnecessary radiation toward the rear of the horn. In Figures 8a and b,
The electromagnetic horn 1 similar to that shown in FIG. 1 is provided with a shielding tube 83. The shielding tube 83 is the fin 8
It opens on the horn opening 2 side so as to enclose one part. 9a and 9b show the same shielding tube 93 as shown in FIG. 8, with a radio wave absorber 94 attached to the inner wall thereof. It goes without saying that such a shielding tube and radio wave absorber can also be applied to the embodiments shown in FIGS. 5 to 7.
これら２つの実施例では、外径が大きくなるの
で必然的に第１１図の説明で述べたいわゆるブロ
ツキングは第１の発明にくらべればやや大きくな
るが、従来例よりは小さく、例えばオフセツトア
ンテナ等、ホーンのブロツキングの無い構成のア
ンテナの一次放射器として用いることも可能であ
る。 In these two embodiments, since the outer diameter is large, the so-called blocking described in the explanation of FIG. 11 is inevitably a little larger than in the first invention, but smaller than in the conventional example, such as an offset antenna, etc. , it is also possible to use it as a primary radiator of an antenna with a structure without horn blocking.
以上説明したように、本発明の第１の発明は電
磁ホーンの外壁に周方向に使用周波数の約1/4波
長の深さを有し、かつ底部がホーン中心軸とほぼ
平行になるような導体溝を設けることにより、ホ
ーン中心軸と直交する面内への広がりの少ないコ
ンパクトな形状で、回転対称性及び交差偏波が優
れた放射特性を実現できる効果がある。
As explained above, the first aspect of the present invention is such that the outer wall of the electromagnetic horn has a depth of approximately 1/4 wavelength of the operating frequency in the circumferential direction, and the bottom portion is approximately parallel to the central axis of the horn. Providing the conductor groove has the effect of realizing radiation characteristics with excellent rotational symmetry and cross-polarization with a compact shape that does not spread much in a plane perpendicular to the central axis of the horn.
本発明の電磁ホーンは、例えばいわゆる単一焦
点パラボラアンテナの一次放射器に用いることに
より、ブロツキングが小さく高利得で低サイドロ
ーブの放射特性のアンテナを実現出来る等の大き
な効果を生ずる。 When the electromagnetic horn of the present invention is used, for example, as a primary radiator of a so-called single focus parabolic antenna, it produces great effects such as realizing an antenna with low blocking, high gain, and low sidelobe radiation characteristics.
また、本発明の第２の発明によれば、第１の発
明のものに遮蔽筒を設けることにより、ブロツキ
ングは第１の発明のものよりやや大きくなるもの
の、ホーンの背後方向への不要放射を少なくする
と共に、高利得、低サイドローブの電磁ホーンを
提供できる。 Further, according to the second aspect of the present invention, by providing a shielding tube in the first aspect, although blocking is slightly larger than that in the first aspect, unnecessary radiation toward the rear of the horn can be prevented. It is possible to provide an electromagnetic horn with high gain and low side lobes.
第１図ａ，ｂは第１の発明の第１の実施例を正
面図、半断面図で示し、第２図は第１図の実施例
の放射特性の実測値を示した図、第３図ａ，ｂは
第１の発明の第２の実施例を正面図、半断面図で
示し、第４図は第３図の実施例の放射特性の実測
値を示した図、第５図ａ，ｂは第１の発明の第３
の実施例を正面図、半断面図で示し、第６図ａ，
ｂは第１の発明の第４の実施例を正面図、半断面
図で示し、第７図ａ，ｂは第１の発明の第５の実
施例を正面図、半断面図で示し、第８図ａ，ｂ、
第９図ａ，ｂはそれぞれ、第２の発明の第１、第
２の実施例を正面図、半断面図で示し、第１０図
ａ，ｂは従来例の正面図、半断面図、第１１図
ａ，ｂは本発明が適用されるパラボラアンテナの
主要部の正面図、半断面図。
図中、１は電磁ホーン、２はホーン開口部、３
は円形ホーン。
1A and 1B show a front view and a half-sectional view of the first embodiment of the first invention, FIG. 2 is a diagram showing the measured values of the radiation characteristics of the embodiment of FIG. Figures a and b show a front view and a half sectional view of the second embodiment of the first invention, Figure 4 is a diagram showing the measured values of the radiation characteristics of the embodiment of Figure 3, and Figure 5 a. , b is the third invention of the first invention.
The embodiment is shown in a front view and a half sectional view, and FIGS.
7b shows the fourth embodiment of the first invention in a front view and a half sectional view, and FIGS. 7a and 7b show the fifth embodiment of the first invention in a front view and a half sectional view. Figure 8 a, b,
9a and 9b show a front view and a half sectional view of the first and second embodiments of the second invention, respectively, and FIGS. 10a and 10b show a front view, a half sectional view, and a half sectional view of the conventional example. 11a and 11b are a front view and a half sectional view of the main parts of a parabolic antenna to which the present invention is applied. In the figure, 1 is an electromagnetic horn, 2 is a horn opening, and 3
is a circular horn.
Claims (1)
磁ホーンにおいて、前記電磁ホーンの外壁に、該
電磁ホーンの中心軸方向に間隔をおいてフインを
複数個設けることにより、使用周波数の約1/4波
長の深さを有する導体溝を該電磁ホーンの周方向
に設け、かつ該導体溝の底部が前記中心軸にほぼ
平行になるようにしたことを特徴とする電磁ホー
ン。 ２ 特許請求の範囲第１項記載の電磁ホーンにお
いて、前記ホーン開口部の形状が円形または方形
あるいは楕円形であり、前記フインの輪郭を、前
記ホーン開口部の形状と同じにしたことを特徴と
する電磁ホーン。 ３ 特許請求の範囲第２項記載の電磁ホーンにお
いて、前記フインを、前記ホーン開口部に向かつ
てホーン状に開くように傾斜させたことを特徴と
する電磁ホーン。 ４ 電磁波の送受信を行う為の開口部を有する電
磁ホーンにおいて、前記電磁ホーンの外壁に、該
電磁ホーンの中心軸方向に間隔をおいてフインを
複数個設けることにより、使用周波数の約1/4波
長の深さを有する導体溝を該電磁ホーンの周方向
に設け、かつ該導体溝の底部が前記中心軸にほぼ
平行になるようにし、前記複数のフインを、前記
ホーン開口部に向かつてホーン状に開口するよう
に前記電磁ホーンに設けた遮蔽筒で内包するよう
にしたことを特徴とする電磁ホーン。 ５ 特許請求の範囲第４項記載の電磁ホーンにお
いて、前記遮蔽筒の内壁に電波吸収体を付設した
ことを特徴とする電磁ホーン。[Scope of Claims] 1. In an electromagnetic horn having an opening for transmitting and receiving electromagnetic waves, a plurality of fins are provided on the outer wall of the electromagnetic horn at intervals in the direction of the central axis of the electromagnetic horn. An electromagnetic horn characterized in that a conductor groove having a depth of about 1/4 wavelength of a frequency is provided in the circumferential direction of the electromagnetic horn, and the bottom of the conductor groove is substantially parallel to the central axis. 2. The electromagnetic horn according to claim 1, wherein the shape of the horn opening is circular, square, or elliptical, and the outline of the fins is the same as the shape of the horn opening. An electromagnetic horn. 3. The electromagnetic horn according to claim 2, wherein the fins are inclined so as to open into a horn shape toward the horn opening. 4. In an electromagnetic horn having an opening for transmitting and receiving electromagnetic waves, by providing a plurality of fins on the outer wall of the electromagnetic horn at intervals in the direction of the central axis of the electromagnetic horn, approximately 1/4 of the operating frequency can be reduced. A conductor groove having a depth equal to the wavelength is provided in the circumferential direction of the electromagnetic horn, and the bottom of the conductor groove is approximately parallel to the central axis, and the plurality of fins are directed toward the horn opening. 1. An electromagnetic horn, characterized in that the electromagnetic horn is enclosed in a shielding cylinder provided in the electromagnetic horn so as to have a shaped opening. 5. The electromagnetic horn according to claim 4, characterized in that a radio wave absorber is attached to the inner wall of the shielding tube.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29077785A JPS62151003A (en) | 1985-12-25 | 1985-12-25 | Electromagnetic horn |
| US06/945,979 US4897663A (en) | 1985-12-25 | 1986-12-24 | Horn antenna with a choke surface-wave structure on the outer surface thereof |
| CA000526284A CA1262773A (en) | 1985-12-25 | 1986-12-24 | Horn antenna with a choke surface-wave structure on the outer surface thereof |
| DE8686118115T DE3678121D1 (en) | 1985-12-25 | 1986-12-29 | HORN ANTENNA WITH LOCKER ARRANGEMENT FOR SURFACE WAVES AND THE OUTSIDE. |
| EP86118115A EP0227121B1 (en) | 1985-12-25 | 1986-12-29 | Horn antenna with a choke surface-wave structure on the outer surface thereof |
| AU67058/86A AU590812B2 (en) | 1985-12-25 | 1986-12-30 | Horn antenna with a choke surface-wave structure on the outer surface thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29077785A JPS62151003A (en) | 1985-12-25 | 1985-12-25 | Electromagnetic horn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62151003A JPS62151003A (en) | 1987-07-06 |
| JPH035085B2 true JPH035085B2 (en) | 1991-01-24 |
Family
ID=17760382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29077785A Granted JPS62151003A (en) | 1985-12-25 | 1985-12-25 | Electromagnetic horn |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62151003A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009139365A1 (en) | 2008-05-12 | 2009-11-19 | 学校法人 早稲田大学 | Process for production of cis-4-hydroxy-l-proline |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6930647B2 (en) | 2001-05-17 | 2005-08-16 | Hitachi Kokusai Electric Inc. | Semicircular radial antenna |
| JP5557652B2 (en) * | 2010-08-19 | 2014-07-23 | 京セラ株式会社 | Antenna structure and array antenna |
| JP5854888B2 (en) * | 2011-08-29 | 2016-02-09 | 三菱電機株式会社 | Primary radiator and antenna device |
| JP6172232B2 (en) * | 2015-09-29 | 2017-08-02 | 東芝電波プロダクツ株式会社 | Horn antenna |
-
1985
- 1985-12-25 JP JP29077785A patent/JPS62151003A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009139365A1 (en) | 2008-05-12 | 2009-11-19 | 学校法人 早稲田大学 | Process for production of cis-4-hydroxy-l-proline |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62151003A (en) | 1987-07-06 |
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Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
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