JPH0625997Y2 - Radio wave absorber - Google Patents
Radio wave absorberInfo
- Publication number
- JPH0625997Y2 JPH0625997Y2 JP1988145920U JP14592088U JPH0625997Y2 JP H0625997 Y2 JPH0625997 Y2 JP H0625997Y2 JP 1988145920 U JP1988145920 U JP 1988145920U JP 14592088 U JP14592088 U JP 14592088U JP H0625997 Y2 JPH0625997 Y2 JP H0625997Y2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- introducing section
- wave absorber
- dielectric loss
- wave introducing
- 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
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は電波吸収体の構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of an electromagnetic wave absorber.
（従来の技術） 従来、電波吸収体の構造としては特公昭46−12228号公
報に開示されたものがあり、その構造はフェライト板電
波吸収壁の前面にジグザグ形電波吸収壁を配置したフェ
ライトと誘電損失材料からなるものである。この複合電
波吸収体はフェライト層及び誘電体層を適切に選択する
ことにより広帯域な特性が得られる。(Prior Art) Conventionally, there is a structure of a radio wave absorber disclosed in Japanese Patent Publication No. 46-12228, and the structure is a ferrite plate in which a zigzag type radio wave absorption wall is arranged in front of a radio wave absorption wall. It is made of a dielectric loss material. This composite electromagnetic wave absorber can obtain broadband characteristics by appropriately selecting the ferrite layer and the dielectric layer.
（考案が解決しようとする課題） しかしながら、上記従来の複合電波吸収体ではフェライ
ト層と誘電体層のインピーダンス整合により成立してい
るため30MHz〜1000MHzを対象とした広帯域電波吸収体に
おいて第３図に示す周波数−反射減衰量特性図からわか
るように30MHz〜100MHzの低周波帯域で良好な特性を得
ようとするジグザク形電波吸収壁の長さ1000mmの電波吸
収体の場合フェライトの特性を生かそうとするため500M
Hz以上の特性がむしろ悪化する傾向があった。また、50
0MHz以上の高周波数帯域で良好な特性を得ようとするジ
グザグ形電波吸収壁の長さ1000mmの電波吸収体の場合フ
ェライト層と誘電体層とのインピーダンス整合に不都合
が生じて第３図からわかるように50MHz〜100MHzにおい
てリップルが生じてしまうという問題点があった。(Problems to be solved by the invention) However, in the above-mentioned conventional composite electromagnetic wave absorber, since it is established by impedance matching between the ferrite layer and the dielectric layer, a broadband electromagnetic wave absorber for 30 MHz to 1000 MHz is shown in FIG. As can be seen from the frequency-return attenuation characteristic chart shown, in the case of a zigzag type electromagnetic wave absorber with a 1000 mm long electromagnetic wave absorber wall, the characteristics of ferrite are tried to be used to obtain good characteristics in the low frequency band of 30 MHz to 100 MHz. To do 500M
The characteristics above Hz tended to deteriorate rather. Also, 50
In the case of a zigzag type wave absorber with a length of 1000 mm, which tries to obtain good characteristics in a high frequency band of 0 MHz or more, impedance matching between the ferrite layer and the dielectric layer causes a problem, which can be seen from Fig. 3. As described above, there is a problem that ripples occur at 50 MHz to 100 MHz.
本考案はこれらの問題点を解決するためのもので、広周
波数帯域において良好な特性が得られる電波吸収体を提
供することを目的とする。The present invention is intended to solve these problems, and an object thereof is to provide a radio wave absorber that can obtain good characteristics in a wide frequency band.
（課題を解決するための手段） 本考案は前記問題点を解決するために、電波到来方向
に、発泡体材料を基材とする誘電損失材料からなるウェ
ッジ形状の第１の電波導入部と、この第１の電波導入部
の背面に配置した発泡体材料を基材とする誘電損失材料
からなる平板状のフラット部と、このフラット部の背面
に配置した完全反射体で裏打ちされた焼結体のフェライ
トとからなる複合電波吸収体において、第１の電波導入
部におけるフェライトの面からウェッジの先端までの高
さより低い、発泡体材料を基材とする誘電損失材料から
なる第２の電波導入部を、隣接する各第１の電波導入部
の間に設けたことに特徴がある。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a wedge-shaped first radio wave introducing portion made of a dielectric loss material having a foam material as a base material in the radio wave arrival direction, A flat body made of a dielectric loss material having a foam material as a base material, disposed on the back surface of the first radio wave introducing portion, and a sintered body lined with a perfect reflector disposed on the back surface of the flat portion. A second radio wave introducing section made of a dielectric loss material based on a foam material, which is lower than the height from the ferrite surface to the tip of the wedge in the first radio wave introducing section. Is provided between the adjacent first radio wave introducing units.
（作用） 以上のような構成からなる本考案によれば、第１、第２
の電波導入部の相互作用によって30MHz〜1000MHzを対象
とした広周波数帯域で電波吸収体の機能として必要とす
る20dB以上の反射減衰量を得ることができ、かつリップ
ルのない良好な特性が得られる。(Operation) According to the present invention configured as described above, the first and second
Due to the interaction of the radio wave introduction part, the return loss of 20 dB or more required for the function of the radio wave absorber can be obtained in a wide frequency band covering 30 MHz to 1000 MHz, and good characteristics without ripple can be obtained. .
したがって、本考案は前記問題点を解決でき、広周波数
帯域において良好な特性が得られる電波吸収体を提供で
きる。Therefore, the present invention can solve the above-mentioned problems and provide a radio wave absorber that can obtain good characteristics in a wide frequency band.
（実施例） 以下、本考案の一実施例を図面に基づいて説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本考案の一実施例の構造を示す断面図である。
同図において、１は電波を完全に反射する反射体、２は
反射体１上に焼結されたフェライト、３はフェライト２
上に発泡体材料を基材とする誘電損失材料からなる平板
状のフラット部、４は発泡体材料を基材とする誘電損失
材料からなるウェッジ形状の電波導入部、５は電波導入
部４のウェッジの先端からフェライト２の面に垂線を下
ろしたときの長さより低く、つまりフェライト２の面か
ら先端までの高さより低く、かつ電波導入部４の先端よ
りフラット部３の方向に下がっており、隣接する電波導
入部４の間に配置した発泡体材料を基材とする誘電損失
材料からなる電波導入部である。ここで、電波導入部５
は隣接する電波導入部４の間に差し込んで形成したり、
電波吸収部４と一体形成するものとする。また、電波導
入部５の抵抗率は反射減衰特性から鑑み電波導入部４の
抵抗率と同じとする方が望ましい。FIG. 1 is a sectional view showing the structure of an embodiment of the present invention.
In the figure, 1 is a reflector that completely reflects radio waves, 2 is a ferrite sintered on the reflector 1, and 3 is a ferrite 2.
A flat plate-shaped flat portion made of a dielectric loss material having a foam material as a base, 4 is a wedge-shaped radio wave introducing section made of a dielectric loss material having a foam material as a base, and 5 is a radio wave introducing section 4. It is lower than the length when a perpendicular is drawn from the tip of the wedge to the surface of the ferrite 2, that is, lower than the height from the surface of the ferrite 2 to the tip, and it is lowered from the tip of the radio wave introducing section 4 toward the flat section 3. It is a radio wave introducing section made of a dielectric loss material having a foam material as a base material, which is arranged between adjacent radio wave introducing sections 4. Here, the radio wave introducing unit 5
Is formed by inserting it between adjacent radio wave introducing parts 4,
It is formed integrally with the radio wave absorber 4. Further, it is desirable that the resistivity of the radio wave introducing unit 5 be the same as the resistivity of the radio wave introducing unit 4 in view of the return loss characteristics.
第１図に示す本実施例の複合電波吸収体では第２図に示
す周波数−反射減衰量特性図からわかるように広周波数
帯域において通常電波吸収体の機能として必要な20dB以
上を維持している。また、同図に示す本実施例の特性は
第１図の複合電波吸収体全体の長さを1000mmとしたもの
であるが、本実施例の複合電波吸収体の500MHz以上の反
射減衰量は従来の複合電波吸収体（全長1500mm）と同等
となり、電波吸収体の小型化、低コスト化を図れる。さ
らに、第２図に示す周波数−反射減衰量特性図からわか
るように、本実施例の複合電波吸収体ではリップルは発
生していない。As can be seen from the frequency-reflection attenuation characteristic diagram shown in FIG. 2, the composite electromagnetic wave absorber of this embodiment shown in FIG. 1 maintains 20 dB or more required for the function of the ordinary electromagnetic wave absorber in a wide frequency band. . Further, the characteristic of this embodiment shown in the same figure is that the total length of the composite electromagnetic wave absorber of FIG. 1 is 1000 mm, but the return loss of 500 MHz or more of the composite electromagnetic wave absorber of this embodiment is the conventional one. This is equivalent to the composite electromagnetic wave absorber (total length 1500 mm), and it is possible to reduce the size and cost of the electromagnetic wave absorber. Furthermore, as can be seen from the frequency-reflection attenuation amount characteristic diagram shown in FIG. 2, no ripple is generated in the composite electromagnetic wave absorber of this embodiment.
（考案の効果） 以上説明したように、本考案によれば、第１、第２の電
波導入部の相互作用によって広周波数帯域で電波吸収体
の機能として必要とする反射減衰量を得ることができ、
かつリップルのない良好な特性が得られる電波吸収体を
提供できる。(Effects of the Invention) As described above, according to the present invention, the return loss required for the function of the radio wave absorber in a wide frequency band can be obtained by the interaction of the first and second radio wave introducing portions. You can
Further, it is possible to provide a radio wave absorber that can obtain good characteristics without ripples.
第１図は本考案の一実施例の構造を示す断面図、第２図
は本実施例の周波数−反射減衰量特性を示す図、第３図
は従来の周波数−反射減衰量特性を示す図である。 １……反射体、２……フェライト、 ３……フラット部、 ４，５……電波導入部。FIG. 1 is a sectional view showing the structure of an embodiment of the present invention, FIG. 2 is a diagram showing the frequency-return loss characteristic of this embodiment, and FIG. 3 is a diagram showing the conventional frequency-return loss characteristic. Is. 1 ... Reflector, 2 ... Ferrite, 3 ... Flat part, 4, 5 ... Radio wave introducing part.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 昭46−8625（ＪＰ，Ｂ１) 特公 昭48−23871（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. 46-8625 (JP, B1) Japanese Publication No. 48-23871 (JP, B1)
Claims (3)
誘電損失材料からなるウェッジ形状の第１の電波導入部
と、該第１の電波導入部の背面に配置した発泡体材料を
基材とする誘電損失材料からなる平板状のフラット部
と、該フラット部の背面に配置した完全反射体で裏打ち
された焼結体のフェライトとからなる複合電波吸収体に
おいて、 前記第１の電波導入部における前記フェライトの面から
ウェッジの先端までの高さより低い、発砲体材料を基材
とする誘電損失材料からなる第２の電波導入部を、隣接
する各前記第１の電波導入部の間に設けたことを特徴と
する電波吸収体。1. A wedge-shaped first radio wave introducing section made of a dielectric loss material having a foam material as a base material and a foam material arranged on the back surface of the first radio wave introducing section in a radio wave arrival direction. A composite radio wave absorber comprising a flat plate-shaped flat portion made of a dielectric loss material as a base material and a sintered ferrite body lined with a perfect reflector disposed on the back surface of the flat portion, wherein the first radio wave is provided. A second radio wave introducing section, which is lower than the height from the ferrite surface to the tip of the wedge in the introducing section and is made of a dielectric loss material having a foam material as a base material, is provided between the adjacent first radio wave introducing sections. An electromagnetic wave absorber characterized by being provided in.
入部とを一体成形する請求項１に記載の電波吸収体。2. The radio wave absorber according to claim 1, wherein the first radio wave introducing section and the second radio wave introducing section are integrally molded.
入部の抵抗率を同じにする請求項１に記載の電波吸収
体。3. The radio wave absorber according to claim 1, wherein the first radio wave introducing section and the second radio wave introducing section have the same resistivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988145920U JPH0625997Y2 (en) | 1988-11-10 | 1988-11-10 | Radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988145920U JPH0625997Y2 (en) | 1988-11-10 | 1988-11-10 | Radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0267699U JPH0267699U (en) | 1990-05-22 |
| JPH0625997Y2 true JPH0625997Y2 (en) | 1994-07-06 |
Family
ID=31414935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988145920U Expired - Lifetime JPH0625997Y2 (en) | 1988-11-10 | 1988-11-10 | Radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625997Y2 (en) |
-
1988
- 1988-11-10 JP JP1988145920U patent/JPH0625997Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0267699U (en) | 1990-05-22 |
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