JPH04206999A - Wave absorber - Google Patents

Wave absorber

Info

Publication number
JPH04206999A
JPH04206999A JP33934990A JP33934990A JPH04206999A JP H04206999 A JPH04206999 A JP H04206999A JP 33934990 A JP33934990 A JP 33934990A JP 33934990 A JP33934990 A JP 33934990A JP H04206999 A JPH04206999 A JP H04206999A
Authority
JP
Japan
Prior art keywords
wave absorber
radio wave
conical
incident
electric field
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.)
Pending
Application number
JP33934990A
Other languages
Japanese (ja)
Inventor
Yoshitaka Murase
村瀬 吉孝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP33934990A priority Critical patent/JPH04206999A/en
Publication of JPH04206999A publication Critical patent/JPH04206999A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To make absorption possible even in directions other than vertical or horizontal direction by uniformly placing the 1st wave absorbers, which have a conical shape and can handle insertion from selected electric field directions on the base section. CONSTITUTION:A wave absorber 1b has a conical shape and by being placed in a uniform arrangement on a base section 1a, the wave absorber 1b is always in a perpendicular direction to an incident wave regardless of the direction of the incident electric field. Further, the height of the above-mentioned conical, wave absorber 1b differs depending on the frequency but is kept close to 1/4lambda. In this way, since the shape of the wave absorber 1 which consists of the base section 1a and the wave absorber 1b is conical and these units are uniformly placed on the base section, electric waves can be absorbed in any incident direction of the electric field and it is possible to reduce unnecessary reflections on the wave absorber.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、入射する電波を吸収し、反射波を少なくす
る手段として用いる電波吸収体に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radio wave absorber used as a means for absorbing incident radio waves and reducing reflected waves.

〔従来の技術〕[Conventional technology]

第4図(a)〜(C)は、従来のこの種の電波吸収体の
形状を示す図であり、図において、第4図(aJはピラ
ミッド形電波吸収体、第4図(b)は楔形電波吸収体、
第4図(C)はウネリ形電波吸収体である。
FIGS. 4(a) to 4(C) are diagrams showing the shapes of conventional radio wave absorbers of this type. In the figures, FIG. 4 (aJ is a pyramid-shaped radio wave absorber, wedge-shaped radio wave absorber,
FIG. 4(C) shows a undulating wave absorber.

以下、第4図(a)〜(C)を用いて従来の装置を説明
する。電波吸収体の電波の吸収は、電界の方向がベース
に対して鉛直方向はよく吸収するか、水平方向に対して
はほとんど吸収しない特性かある。
The conventional apparatus will be explained below using FIGS. 4(a) to 4(C). A radio wave absorber has the characteristic of absorbing radio waves by either absorbing well in the direction of the electric field perpendicular to the base, or hardly absorbing it in the horizontal direction.

第4図(a、)のピラミッド形は、相互に一体となって
いるベース部1.0 aと突起部Jobとからなり、ベ
ース部10aに対して鉛直方向および水平方向に対して
はよく吸収する。また第4図(1つ)の楔形は、相互に
一体となっているベース部11aと突起部111〕から
なり、ベース部11aに対して鉛直方向はよく吸収する
。また第4図fc)のウネリ形は、相互に一体となって
いるベース部12aと突部12bからなりベース部12
aに対して鉛直方向および水平方向に対してはよく吸収
する。
The pyramid shape shown in FIG. 4(a) consists of a base part 1.0a and a protrusion part Job that are integral with each other, and has good absorption in the vertical and horizontal directions with respect to the base part 10a. do. The wedge shape shown in FIG. 4 (one) is composed of a base portion 11a and a protrusion 111 which are integral with each other, and absorbs well in the vertical direction with respect to the base portion 11a. Furthermore, the undulating shape shown in FIG.
It absorbs well in the vertical and horizontal directions with respect to a.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来の電波吸収体は、以」二のような形状のものである
ので、ピラミッド形電波吸収およびウネリ形電波吸収体
においては、ベース部に対して鉛直方向および水平方向
に対してはよく吸収する。しかし、それ以外の方向の入
射に対してはほとんど吸収せず斜入射特性か悪いという
問題点かあった。
Conventional radio wave absorbers have the following shapes, so pyramid-shaped and undulating radio wave absorbers absorb well in the vertical and horizontal directions relative to the base. . However, there was a problem in that it hardly absorbed incident light in other directions and had poor oblique incidence characteristics.

この発明は上記のような問題点を解消するためになされ
たものて、鉛直方向および水平方向以外の方向の入射に
対しても吸収することができる電波吸収体を得ることを
目的とする。
The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a radio wave absorber capable of absorbing incident light in directions other than the vertical and horizontal directions.

〔課題を解決するだめの手段〕[Failure to solve the problem]

この発明に係る電波吸収体は、相互に一体とな均等に配
置したものである。また上記円錐形電波吸収体本体の裏
面に金属板を設けたものである。
The radio wave absorbers according to the present invention are mutually integral and evenly arranged. Further, a metal plate is provided on the back surface of the conical radio wave absorber main body.

また上記円錐形電波吸収体本体の間に該円錐形電波吸収
体本体より小型の円錐形電波吸収体本体を配置したちの
である。
Further, a conical radio wave absorber body smaller than the conical radio wave absorber body is arranged between the conical radio wave absorber bodies.

〔作用〕[Effect]

この発明における電波吸収体は、相互に一体となってい
るベース部と電波吸収体(突起部)からなる電波吸収体
の形状を円錐形としてベース部−にに均等に配置し、ま
た上記円錐形電波吸収体本体の裏面に金属板を設け、ま
た上記円錐形電波吸収体本体の間に該円錐形電波吸収体
本体より小型の円錐形電波吸収体本体を配置することに
より、あらゆる方向の電界の入射に対しても安定した吸
収が得られる。
The radio wave absorber according to the present invention includes a base portion and a radio wave absorber (protrusions) that are integral with each other, and the radio wave absorber has a conical shape and is arranged evenly on the base portion. By providing a metal plate on the back surface of the radio wave absorber body and placing a conical radio wave absorber body smaller than the conical radio wave absorber body between the conical radio wave absorber bodies, electric fields in all directions can be suppressed. Stable absorption can be obtained even for incident light.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第1図(aL (b)は本発明の第1の実施例による円
錐形電波吸収体を示す。図において、1は相互に般に電
波吸収体は、種々のアンテナの測定の際に用いられる。
FIG. 1(b) shows a conical radio wave absorber according to a first embodiment of the present invention. .

また電波吸収体を組合わせることにより電波半無響室、
電波暗室を構成することもできる。アンテナの測定の際
には、波源の電界方向か必らずしも電波吸収体のベース
と鉛直方向または水平方向であるとは限らない。従って
電波吸収体で吸収されなかった電界については、反射さ
れることになる。
In addition, by combining radio wave absorbers, a semi-anechoic chamber,
It is also possible to configure an anechoic chamber. When measuring an antenna, the direction of the electric field of the wave source is not necessarily perpendicular or horizontal to the base of the radio wave absorber. Therefore, the electric field that is not absorbed by the radio wave absorber will be reflected.

そこで、本発明の第1の実施例に示すように電波吸収体
1bの形状を円錐形とし、ベース部1a」二に均等に配
置することにより、入射される電界方向がどの方向であ
っても、常に入射波に対して電波吸収体1bが鉛直方向
となり、どの方向の電界が入射しても安定した吸収か期
待できる。また上記円錐形電波吸収体1bの高さは周波
数によって異なるが、1/4λに近い値としている。
Therefore, as shown in the first embodiment of the present invention, the shape of the radio wave absorber 1b is made into a conical shape and is arranged evenly on the base portion 1a'2, regardless of the direction of the incident electric field. , the radio wave absorber 1b is always perpendicular to the incident wave, and stable absorption can be expected no matter which direction the electric field is incident. The height of the conical radio wave absorber 1b varies depending on the frequency, but is set to a value close to 1/4λ.

このように上記第1の実施例では、相互に一体となって
いるベース部1aと電波吸収体(突起部)■bからなる
電波吸収体lの形状を円錐形としてベース部上に均等に
配置したので、あらゆる角度からの電界の入射に対して
電波を吸収するということを効果的に実施でき、電波吸
収体からの不用な反射を少なくすることかできる。
In this way, in the first embodiment, the radio wave absorber l, which consists of the base part 1a and the radio wave absorber (protrusion) b, which are integral with each other, has a conical shape and is arranged evenly on the base part. Therefore, it is possible to effectively absorb radio waves when electric fields are incident from any angle, and unnecessary reflections from the radio wave absorber can be reduced.

また第2の実施例として、第2図に示すように円錐形電
波吸収体本体3の裏面に金属板4を設けてもよい。この
実施例においては誘電損失および誘電率の高い、例えば
銅板等を用いて吸収する経路を2倍とすることにより、
即ち1回目の入射て吸収されなかった電波を金属板4て
反射し他の円錐形電波吸収材で吸収できる。従って吸収
体本体また第3の実施例として、第3図(b)に示すよ
うに上記第1または第2の実施例による均等に配置した
円錐形電波吸収体3bの間にこ゛れより小型の円錐形電
波吸収体本体3cを配置してもよい。この実施例におい
ては、均等に配置した円錐形電波吸収体本体3bの高さ
は上述したように1/4λに近い値であるが、小型の円
錐形電波吸収体本体3cの高さは(1/ 2 n )λ
(n=3. 4. 、 、 )とすることにより、電波
の吸収をさらに強くすることかできる。
Further, as a second embodiment, a metal plate 4 may be provided on the back surface of the conical radio wave absorber main body 3, as shown in FIG. In this example, by doubling the absorption path using a material with high dielectric loss and high permittivity, such as a copper plate,
That is, the radio waves that were not absorbed during the first incident are reflected by the metal plate 4 and can be absorbed by another conical radio wave absorbing material. Therefore, as shown in FIG. 3(b), the absorber main body or, as a third embodiment, a smaller one is inserted between the evenly arranged conical radio wave absorbers 3b according to the first or second embodiment. A conical radio wave absorber main body 3c may be arranged. In this embodiment, the height of the conical radio wave absorber bodies 3b evenly arranged is close to 1/4λ as described above, but the height of the small conical radio wave absorber body 3c is (1/4λ). /2n)λ
By setting (n=3.4., , , ), it is possible to further strengthen the absorption of radio waves.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明に係る円錐形電波吸収材によれ
ば、相互に一体となっているベース部と電波吸収体(突
起部)からなる電波吸収体の形状を円錐形としてベース
部上に均等に配置し、また、この円錐形電波吸収体本体
の裏面に金属板を設け、また上記円錐形電波吸収体本体
の間に該円錐形電波吸収体本体より小型の円’1ff−
形電波吸収体本体を配置したので、あらゆる角度からの
電界の入射に対して電波を効果的に吸収することかでき
、電波吸収体からの不要な反射を少なくすることかでき
る効果かある。
As described above, according to the conical radio wave absorbing material according to the present invention, the radio wave absorber consisting of the base part and the radio wave absorber (protrusion part) which are integral with each other has a conical shape and can be placed on the base part. A metal plate is provided on the back side of the conical radio wave absorber main body, and a circle '1ff- smaller than the conical radio wave absorber main body is arranged between the conical radio wave absorber main bodies.
Since the shaped radio wave absorber body is arranged, it is possible to effectively absorb radio waves from incident electric fields from all angles, and has the effect of reducing unnecessary reflections from the radio wave absorber.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図(a)および(b)はこの発明の第1の実施例に
よる円錐形電波吸収体およびその配置を示す斜視図およ
び配置図、第2図はこの発明の第2の実施例による金属
板を取り付けた円錐形電波吸収体の構成を示す図、第3
図(a)および(b)はこの発明の第2の実施例および
第3の実施例による円錐形電波吸収体の配置を示す配置
図、第4図は従来例による電波吸収体の形状を示す斜視
図である。 図において、■は円錐形電波吸収体、1aはベース、■
bは突起部、2は金属板、3は均等な配置の円錐形電波
吸収体、3aはベース、3b、3Cは突起部、4は大小
とり混ぜた配置の円錐形電波吸収体である。 なお図中同一符号は同−又は相当部分を示す。
1(a) and (b) are perspective views and arrangement views showing a conical radio wave absorber according to a first embodiment of the present invention and its arrangement, and FIG. 2 is a metallurgical wave absorber according to a second embodiment of the present invention. Figure 3 showing the configuration of a conical radio wave absorber with a plate attached.
Figures (a) and (b) are layout diagrams showing the arrangement of conical radio wave absorbers according to the second and third embodiments of the present invention, and Figure 4 shows the shape of the radio wave absorber according to a conventional example. FIG. In the figure, ■ is a conical radio wave absorber, 1a is a base, and ■
2 is a protrusion, 2 is a metal plate, 3 is a conical radio wave absorber arranged evenly, 3a is a base, 3b and 3C are protrusions, and 4 is a conical radio wave absorber arranged in a mixed manner. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (3)

【特許請求の範囲】[Claims] (1)相互に一体となっている、ベース部と突起部から
なる電波吸収体において、 任意の電界方向の入射に対応できる断面等辺の円錐形の
第1の電波吸収体を上記ベース部上に均等に配置したこ
とを特徴とする電波吸収体。
(1) In a radio wave absorber consisting of a base portion and a protrusion that are integral with each other, a first radio wave absorber having a conical cross section with equal sides that can accommodate incidence of an electric field in any direction is placed on the base portion. A radio wave absorber characterized by being evenly distributed.
(2)請求項1記載の電波吸収体において、上記ベース
部の裏面に金属板を取りつけたことを特徴とする電波吸
収体。
(2) The radio wave absorber according to claim 1, wherein a metal plate is attached to the back surface of the base portion.
(3)請求項1または2記載の電波吸収体において、 上記ベース部上に均等に配置された上記第1の電波吸収
体の間に、該第1の電波吸収体より小型の第2の電波吸
収体を設けたことを特徴とする電波吸収体。
(3) The radio wave absorber according to claim 1 or 2, wherein a second radio wave absorber smaller than the first radio wave absorber is arranged between the first radio wave absorbers evenly arranged on the base part. A radio wave absorber characterized by being provided with an absorber.
JP33934990A 1990-11-30 1990-11-30 Wave absorber Pending JPH04206999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33934990A JPH04206999A (en) 1990-11-30 1990-11-30 Wave absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33934990A JPH04206999A (en) 1990-11-30 1990-11-30 Wave absorber

Publications (1)

Publication Number Publication Date
JPH04206999A true JPH04206999A (en) 1992-07-28

Family

ID=18326615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33934990A Pending JPH04206999A (en) 1990-11-30 1990-11-30 Wave absorber

Country Status (1)

Country Link
JP (1) JPH04206999A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666105U (en) * 1993-02-12 1994-09-16 島田理化工業株式会社 Waveguide low-pass filter
JP2002009483A (en) * 2000-06-26 2002-01-11 Kitagawa Ind Co Ltd Electric-wave absorbing body
KR20030014787A (en) * 2001-08-13 2003-02-20 김동일 Wide-band ferrite electromagnetic wave absorber
JP2008066340A (en) * 2006-09-04 2008-03-21 Nec Tokin Corp Electromagnetic wave absorber
JP2015018025A (en) * 2013-07-09 2015-01-29 日本電信電話株式会社 Electromagnetic wave anti-reflection structure and manufacturing method therefor
CN104445934A (en) * 2014-11-11 2015-03-25 中国人民解放军国防科学技术大学 High-temperature-resistant wedge-shaped microwave absorbing material and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666105U (en) * 1993-02-12 1994-09-16 島田理化工業株式会社 Waveguide low-pass filter
JP2002009483A (en) * 2000-06-26 2002-01-11 Kitagawa Ind Co Ltd Electric-wave absorbing body
KR20030014787A (en) * 2001-08-13 2003-02-20 김동일 Wide-band ferrite electromagnetic wave absorber
JP2008066340A (en) * 2006-09-04 2008-03-21 Nec Tokin Corp Electromagnetic wave absorber
JP2015018025A (en) * 2013-07-09 2015-01-29 日本電信電話株式会社 Electromagnetic wave anti-reflection structure and manufacturing method therefor
CN104445934A (en) * 2014-11-11 2015-03-25 中国人民解放军国防科学技术大学 High-temperature-resistant wedge-shaped microwave absorbing material and preparation method thereof

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