JP2008218790A - Electromagnetic wave absorber and manufacturing method of the electromagnetic wave absorber - Google Patents

Electromagnetic wave absorber and manufacturing method of the electromagnetic wave absorber Download PDF

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JP2008218790A
JP2008218790A JP2007055518A JP2007055518A JP2008218790A JP 2008218790 A JP2008218790 A JP 2008218790A JP 2007055518 A JP2007055518 A JP 2007055518A JP 2007055518 A JP2007055518 A JP 2007055518A JP 2008218790 A JP2008218790 A JP 2008218790A
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electromagnetic wave
resistance
wave absorber
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sheet
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JP4864770B2 (en
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Osamu Hashimoto
橋本　　修
Hirokazu Suzuki
宏和 鈴木
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Kumagai Gumi Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic wave absorber in which a resistance sheet is provided between one face and one face which face each other in two spacers, thereby absorbing electromagnetic waves of two frequency bands, and a variation of a frequency absorbing characteristic is small. <P>SOLUTION: The electromagnetic wave absorber comprises a resistance part 4 between one face and one face which face each other in two spacers 2, 3 having a flat plate shape, and further comprises a reflection part 5 on the other face of the one spacer 3. The resistance part 4 is formed by overlapping two resistance sheets 8, 8 of a face resistance value 380±60 Ω square. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、周波数吸収特性のばらつきを少なくできる電磁波吸収体、及び、一種類の面抵抗値の抵抗シートを、二つの周波数帯の電磁波を吸収できる電磁波吸収体の製造と単一周波数帯の電磁波を吸収できる電磁波吸収体の製造とに共用可能とした電磁波吸収体の製造方法に関する。   The present invention relates to an electromagnetic wave absorber capable of reducing variation in frequency absorption characteristics, and a sheet of resistance sheet having a single surface resistance value, manufacturing an electromagnetic wave absorber capable of absorbing electromagnetic waves in two frequency bands, and electromagnetic waves in a single frequency band. The present invention relates to a method for manufacturing an electromagnetic wave absorber that can be used commonly for manufacturing an electromagnetic wave absorber that can absorb water.

スペーサ、抵抗部、反射部を備えた電磁波吸収体が知られている（例えば、特許文献１，２，３参照）。
例えば、スペーサとしての二つの石膏ボードを用いて二つの周波数帯の電磁波を吸収させる電磁波吸収体を作る場合は、図４（ａ）に示すように、二つの石膏ボード５０；５１の互いに対向する一方の面と一方の面との間に抵抗部を形成する面抵抗値２０００±５００Ω□（単位面あたり抵抗）の抵抗シート５２を設け、一方の石膏ボード５０の他方の面に抵抗部を形成する面抵抗値２００±２０Ω□の抵抗シート５３を設け、他方の石膏ボード５１の他方の面に反射部を形成する金属膜５４を設ける。この際、石膏ボード５０；５１の厚さｄを２５ｍｍとすれば、５．２ＧＨｚ帯と２．４５ＧＨｚ帯との両方の周波数帯の電磁波を吸収できる電磁波吸収体となる。
また、図５（ａ）に示すように、二つの石膏ボード５０；５１の互いに対向する一方の面と一方の面との間に面抵抗値１９０±３０Ω□の抵抗シート５５を設け、他方の石膏ボード５１の他方の面に金属膜５４を設ける。この際、石膏ボード５０；５１の厚さｄを２５ｍｍとすれば、５．２ＧＨｚ帯と２．４５ＧＨｚ帯との両方の周波数帯の電磁波を吸収できる電磁波吸収体となる。
また、一つの石膏ボードを用いる場合は、石膏ボードの厚さｄを選択することで吸収対象周波数帯を選択できる。例えば、図４（ｂ）及び図５（ｂ）に示すように、石膏ボード６０の一方の面に面抵抗値３８０±６０Ω□の抵抗シート６１を設け、石膏ボード６０の他方の面に金属膜５４を設ける。この際、石膏ボード６０の厚さｄを９．５ｍｍとすれば、５．２ＧＨｚ帯の電磁波を吸収できる電磁波吸収体となり、石膏ボードの厚さｄを１９ｍｍとすれば、２．４５ＧＨｚ帯の電磁波を吸収できる電磁波吸収体となる。
ところで、図４（ａ）や図５（ａ）に示した二つの周波数帯の電磁波を吸収できる電磁波吸収体と、図４（ｂ）や図５（ｂ）に示した単一周波数帯の電磁波を吸収できる電磁波吸収体とを共に生産するに際しては、できるだけ部品数を減らしたい。しかしながら、図４（ａ）と図４（ｂ）とに示した電磁波吸収体を共に生産する際には、面抵抗値２０００±５００Ω□、面抵抗値２００±２０Ω□、面抵抗値３８０±６０Ω□の抵抗シート、即ち、３種類の抵抗シートを用意する必要がある。また、図５（ａ）と図５（ｂ）とに示した電磁波吸収体を共に生産する際には、面抵抗値１９０±３０Ω□、面抵抗値３８０±６０Ω□の抵抗シート、即ち、２種類の抵抗シートを用意する必要がある。つまり、一種類の面抵抗値の抵抗シートを、二つの周波数帯の電磁波を吸収できる電磁波吸収体の製造と単一周波数帯の電磁波を吸収できる電磁波吸収体の製造とに共用できない。
特開２００２−２６５６８号公報 特開２００４−３５６３２５号公報 特開２００４−２７３８３１号公報 An electromagnetic wave absorber including a spacer, a resistance portion, and a reflection portion is known (see, for example, Patent Documents 1, 2, and 3).
For example, when making an electromagnetic wave absorber that absorbs electromagnetic waves of two frequency bands using two gypsum boards as spacers, two gypsum boards 50; 51 face each other as shown in FIG. A resistance sheet 52 having a surface resistance value of 2000 ± 500Ω □ (resistance per unit surface) is provided between one surface and one surface, and a resistance portion is formed on the other surface of one gypsum board 50. A resistance sheet 53 having a surface resistance value of 200 ± 20Ω □ is provided, and a metal film 54 that forms a reflection portion is provided on the other surface of the other gypsum board 51. At this time, if the thickness d of the gypsum board 50; 51 is 25 mm, an electromagnetic wave absorber capable of absorbing electromagnetic waves in both frequency bands of 5.2 GHz and 2.45 GHz.
Also, as shown in FIG. 5 (a), a resistance sheet 55 having a surface resistance value of 190 ± 30Ω □ is provided between one surface and the other surface of the two gypsum boards 50; A metal film 54 is provided on the other surface of the gypsum board 51. At this time, if the thickness d of the gypsum board 50; 51 is 25 mm, an electromagnetic wave absorber capable of absorbing electromagnetic waves in both frequency bands of 5.2 GHz and 2.45 GHz.
When one gypsum board is used, the frequency band to be absorbed can be selected by selecting the thickness d of the gypsum board. For example, as shown in FIGS. 4 (b) and 5 (b), a resistance sheet 61 having a surface resistance value of 380 ± 60Ω □ is provided on one side of the gypsum board 60, and a metal film is provided on the other side of the gypsum board 60. 54 is provided. At this time, if the thickness d of the gypsum board 60 is 9.5 mm, an electromagnetic wave absorber capable of absorbing electromagnetic waves in the 5.2 GHz band is obtained, and if the thickness d of the gypsum board is 19 mm, electromagnetic waves in the 2.45 GHz band are obtained. It becomes an electromagnetic wave absorber that can absorb water.
By the way, an electromagnetic wave absorber capable of absorbing electromagnetic waves in the two frequency bands shown in FIGS. 4A and 5A, and an electromagnetic wave in the single frequency band shown in FIGS. 4B and 5B. When producing together with an electromagnetic wave absorber that can absorb water, we want to reduce the number of parts as much as possible. However, when the electromagnetic wave absorbers shown in FIGS. 4 (a) and 4 (b) are produced together, the sheet resistance value 2000 ± 500Ω □, the sheet resistance value 200 ± 20Ω □, and the sheet resistance value 380 ± 60Ω. It is necessary to prepare □ resistance sheets, that is, three types of resistance sheets. When the electromagnetic wave absorbers shown in FIGS. 5A and 5B are produced together, a resistance sheet having a sheet resistance value of 190 ± 30Ω □ and a sheet resistance value of 380 ± 60Ω □, that is, 2 It is necessary to prepare various types of resistance sheets. That is, a resistance sheet having a single sheet resistance value cannot be used in both the production of an electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands and the production of an electromagnetic wave absorber that can absorb electromagnetic waves in a single frequency band.
JP 2002-26568 A JP 2004-356325 A JP 2004-238331 A

抵抗シートの面抵抗値は、箇所によってむらが生じるため、図４（ａ）や図５（ａ）に示した二つの周波数帯の電磁波を吸収できる電磁波吸収体のように、二つのスペーサの互いに対向する一方の面と一方の面との間に一つの抵抗シートを設ける構成の場合、場所によって周波数吸収特性にばらつきが生じる電磁波吸収体となってしまう。
また、上述したように、二つの周波数帯の電磁波を吸収できる電磁波吸収体と単一周波数帯の電磁波を吸収できる電磁波吸収体とを共に生産する際には、面抵抗値の異なる複数種類の抵抗シートを用意しなければならず、抵抗シートの製造や管理に手間がかかる。換言すれば、一種類の面抵抗値の抵抗シートを、二つの周波数帯の電磁波を吸収できる電磁波吸収体の製造と単一周波数帯の電磁波を吸収できる電磁波吸収体の製造とに共用できず、二つの周波数帯の電磁波を吸収できる電磁波吸収体と単一周波数帯の電磁波を吸収できる電磁波吸収体とが、一種類の面抵抗値の抵抗シートによって効率的に生産されていない。
本発明は、上記問題点に鑑み、二つのスペーサの互いに対向する一方の面と一方の面との間に抵抗シートを設けて二つの周波数帯の電磁波を吸収できるようにした電磁波吸収体において、周波数吸収特性のばらつきの少ない電磁波吸収体を提供する。
また、抵抗シートとして一種類の面抵抗値の抵抗シートを用いることによって、二つの周波数帯の電磁波を吸収できる電磁波吸収体と単一周波数帯の電磁波を吸収できる電磁波吸収体とを効率的に生産できるようにすることを目的とする。 Since the surface resistance value of the resistance sheet varies depending on the location, the two spacers are mutually connected like the electromagnetic wave absorber that can absorb the electromagnetic waves of the two frequency bands shown in FIG. 4 (a) and FIG. 5 (a). In the case of a configuration in which one resistance sheet is provided between one surface and the other surface, an electromagnetic wave absorber that varies in frequency absorption characteristics depending on the location.
As described above, when producing both an electromagnetic wave absorber capable of absorbing electromagnetic waves in two frequency bands and an electromagnetic wave absorber capable of absorbing electromagnetic waves in a single frequency band, a plurality of types of resistors having different surface resistance values are used. Sheets must be prepared, and it takes time to manufacture and manage resistance sheets. In other words, a resistance sheet having one type of sheet resistance value cannot be shared with the production of an electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands and the production of an electromagnetic wave absorber that can absorb electromagnetic waves in a single frequency band. An electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands and an electromagnetic wave absorber that can absorb electromagnetic waves in a single frequency band are not efficiently produced by a single sheet resistance sheet.
In view of the above problems, the present invention provides an electromagnetic wave absorber that can absorb electromagnetic waves of two frequency bands by providing a resistance sheet between one surface and the other surface of two spacers facing each other. An electromagnetic wave absorber with little variation in frequency absorption characteristics is provided.
In addition, by using a single sheet resistance sheet as a resistance sheet, an electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands and an electromagnetic wave absorber that can absorb electromagnetic waves in a single frequency band can be produced efficiently. The purpose is to be able to.

本発明による電磁波吸収体は、二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に抵抗部を備えるとともに一方のスペーサの他方の面に反射部を備えた電磁波吸収体において、抵抗部が、面抵抗値３８０±６０Ω□の二つの抵抗シートの重ね合わせにより形成されたことを特徴とする。
本発明による電磁波吸収体の製造方法は、二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に抵抗部を備えるとともに一方のスペーサの他方の面に反射部を備えた電磁波吸収体の製造方法において、面抵抗値３８０±６０Ω□の二つの抵抗シートを互いに重ね合わせることによって面抵抗値１９０±３０Ω□の抵抗部を形成したことを特徴とする。
また、二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に、面抵抗値３８０±６０Ω□の二つの抵抗シートを互いに重ね合わせることによって形成された面抵抗値１９０±３０Ω□の抵抗部を設けるとともに、一方のスペーサの他方の面に反射部を設けることによって、二つの周波数帯の電磁波を吸収できる第１の電磁波吸収体を製造するとともに、上記スペーサとは別のスペーサの他方の面に反射部を設け、別のスペーサの一方の面に面抵抗値３８０±６０Ω□の抵抗シートを設けることによって、単一周波数帯の電磁波を吸収できる第２の電磁波吸収体を製造したことも特徴とする。 The electromagnetic wave absorber according to the present invention includes an electromagnetic wave absorber provided with a resistance portion between one surface and the other surface of two flat spacers and a reflection portion on the other surface of one spacer. The resistance portion is formed by superposing two resistance sheets having a surface resistance value of 380 ± 60Ω □.
The manufacturing method of the electromagnetic wave absorber according to the present invention includes a resistance portion between one surface and the other surface of two flat spacers, and a reflection portion on the other surface of one spacer. In the method for manufacturing an electromagnetic wave absorber, a resistance portion having a surface resistance value of 190 ± 30Ω □ is formed by superimposing two resistance sheets having a surface resistance value of 380 ± 60Ω □ on each other.
Further, a sheet resistance value 190 ± formed by superposing two resistance sheets having a sheet resistance value of 380 ± 60Ω □ between one surface and the other surface of two flat spacers facing each other. While providing a resistance portion of 30Ω □ and providing a reflection portion on the other surface of one spacer, a first electromagnetic wave absorber capable of absorbing electromagnetic waves in two frequency bands is manufactured, and different from the spacer A second electromagnetic wave absorber capable of absorbing an electromagnetic wave of a single frequency band is provided by providing a reflection portion on the other surface of the spacer and providing a resistance sheet having a surface resistance value of 380 ± 60Ω □ on one surface of another spacer. It is also characterized by being manufactured.

本発明の電磁波吸収体によれば、抵抗部が、面抵抗値３８０±６０Ω□の二つの抵抗シートの重ね合わせにより形成されたことによって、抵抗部の面抵抗値をばらつきの少ない面抵抗値１９０±３０Ω□とでき、２．４５ＧＨｚ帯の電磁波と５．２ＧＨｚ帯の電磁波とを吸収できる周波数吸収特性のばらつきの少ない高品質の電磁波吸収体を得ることができる。
本発明の電磁波吸収体の製造方法によれば、２．４５ＧＨｚ帯の電磁波と５．２ＧＨｚ帯の電磁波とを吸収できる周波数吸収特性のばらつきの少ない高品質の電磁波吸収体を得ることができる。また、面抵抗値３８０±６０Ω□の抵抗シートを、２．４５ＧＨｚ帯の電磁波を吸収できる電磁波吸収体の製造と５．２ＧＨｚ帯の電磁波とを吸収できる電磁波吸収体の製造とに共用できるので、抵抗シートとして一種類の面抵抗値の抵抗シートを用いることによって、二つの周波数帯の電磁波を吸収できる電磁波吸収体と単一周波数帯の電磁波を吸収できる電磁波吸収体とを効率的に生産できる。 According to the electromagnetic wave absorber of the present invention, the resistance portion is formed by superposing two resistance sheets having a surface resistance value of 380 ± 60 Ω □, so that the surface resistance value of the resistance portion is reduced with less variation. It can be ± 30Ω □, and a high-quality electromagnetic wave absorber that can absorb 2.45 GHz band electromagnetic waves and 5.2 GHz band electromagnetic waves with little variation in frequency absorption characteristics can be obtained.
According to the method for producing an electromagnetic wave absorber of the present invention, it is possible to obtain a high-quality electromagnetic wave absorber that can absorb 2.45 GHz band electromagnetic waves and 5.2 GHz band electromagnetic waves with little variation in frequency absorption characteristics. In addition, since the resistance sheet having a sheet resistance value of 380 ± 60Ω □ can be shared with the manufacture of the electromagnetic wave absorber that can absorb the electromagnetic wave of 2.45 GHz band and the electromagnetic wave absorber that can absorb the electromagnetic wave of 5.2 GHz band, By using a resistance sheet having a single sheet resistance value as the resistance sheet, it is possible to efficiently produce an electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands and an electromagnetic wave absorber that can absorb electromagnetic waves in a single frequency band.

図１は電磁波吸収体を示し、図２は電磁波吸収体の製造方法を示し、図３は一種類の抵抗シートを用いて形成された二種類の電磁波吸収体を示す。   FIG. 1 shows an electromagnetic wave absorber, FIG. 2 shows a method for producing the electromagnetic wave absorber, and FIG. 3 shows two types of electromagnetic wave absorbers formed using one type of resistance sheet.

図１に示すように、電磁波吸収体１は、第１スペーサ２、抵抗部４、第２スペーサ３、反射部５を備える。
第１スペーサ２と第２スペーサ３とが同一の矩形板状に形成される。第１スペーサ２及び第２スペーサ３の寸法は、例えば、縦１８２０ｍｍ、横９１０ｍｍ、厚さｄは２５ｍｍである。 As shown in FIG. 1, the electromagnetic wave absorber 1 includes a first spacer 2, a resistance unit 4, a second spacer 3, and a reflection unit 5.
The first spacer 2 and the second spacer 3 are formed in the same rectangular plate shape. The dimensions of the first spacer 2 and the second spacer 3 are, for example, 1820 mm long, 910 mm wide, and a thickness d of 25 mm.

図２に示すように、第１スペーサ２及び第２スペーサ３は、例えば、縦１８２０ｍｍ、横９１０ｍｍ、厚さ１２．５ｍｍに形成された石膏ボード６が２つ重ね合わされて形成される。
抵抗部４は、２つの抵抗シート８；８が重ね合わされて形成される。抵抗シート８は、例えば、ポリエチレンテレフタレート（ＰＥＴ）樹脂により形成された０．５ｍｍ程度の厚さのシートと、シートの片面に設けられた抵抗体とにより形成される。抵抗体は、例えば、シートの一方の面全体に、アルミニウム、銀、銅等の金属やカーボンを蒸着したり、塗布したりすることにより形成される。そして、抵抗シート８の面抵抗値は３８０±６０Ω□に形成される。
反射部５は、例えば、第２スペーサ３の他方の面全体に、蒸着あるいは塗布されて形成された金属膜、あるいは、アルミ箔，銅箔等の金属箔を貼り付けて形成された金属膜により形成される。 As shown in FIG. 2, the first spacer 2 and the second spacer 3 are formed, for example, by overlapping two gypsum boards 6 formed in a length of 1820 mm, a width of 910 mm, and a thickness of 12.5 mm.
The resistance portion 4 is formed by overlapping two resistance sheets 8; The resistance sheet 8 is formed by, for example, a sheet having a thickness of about 0.5 mm made of polyethylene terephthalate (PET) resin and a resistor provided on one side of the sheet. The resistor is formed, for example, by vapor-depositing or applying a metal such as aluminum, silver, or copper, or carbon over one surface of the sheet. The sheet resistance value of the resistance sheet 8 is 380 ± 60Ω □.
The reflecting portion 5 is made of, for example, a metal film formed by vapor deposition or coating on the other surface of the second spacer 3, or a metal film formed by attaching a metal foil such as an aluminum foil or a copper foil. It is formed.

すなわち、電磁波吸収体１は、第１スペーサ２と第２スペーサ３の互いに対向する一方の面と一方の面との間に抵抗部４を備えるとともに第２スペーサ３の他方の面に反射部５を備えた構成である。抵抗部４は、面抵抗値３８０±６０Ω□に形成された抵抗体同士が互いに重ね合わされた２つの抵抗シート８；８により形成されたことによって、１９０±３０Ω□の面抵抗値を備える。   That is, the electromagnetic wave absorber 1 includes the resistance portion 4 between one surface and the other surface of the first spacer 2 and the second spacer 3 and the reflection portion 5 on the other surface of the second spacer 3. It is the structure provided with. The resistance portion 4 has a sheet resistance value of 190 ± 30Ω □ by being formed by the two resistance sheets 8; 8 in which resistors formed to have a sheet resistance value of 380 ± 60Ω □ are overlapped with each other.

図２を参照し、電磁波吸収体１１の製造方法について説明する。
第１スペーサ２を形成する２つの石膏ボード６；６、第２スペーサ３を形成する２つの石膏ボード６；６、２つの抵抗シート８；８を用意する。第２スペーサ３を形成する一方の石膏ボード６の他方の面に反射部５を設けておく。２つの石膏ボード６；６を一方の面同士を重ねあわせた第１スペーサ２の一方の面と２つの石膏ボード６；６を一方の面同士を重ねあわせた第２スペーサ３の一方の面との間に、面抵抗値３８０±６０Ω□に形成された２つの抵抗シート８；８の抵抗体同士を重ね合わせて設置した状態で、これら積層された第１スペーサ２、抵抗部４、第２スペーサ３により形成された矩形体の角部に矩形体を貫通する貫通孔１５を形成し、第１スペーサ２の他方の面と第２スペーサ３の他方の面における貫通孔の周りにナット収納溝１６を形成しておく。そして、第１スペーサ２、抵抗部４、第２スペーサ３を貫通するように貫通孔１５にねじ棒１７を通し、ねじ棒１７の両端にナット１８を取付けてナット１８を収納溝１６内に収容して締結する。これにより、第１スペーサ２と第２スペーサ３との間に抵抗部４が挟まれた状態の電磁波吸収体１を形成できる。尚、２つの石膏ボード６；６同士や、第１スペーサ２の一方の面と一方の抵抗シート８の抵抗体を備えない面や、第２スペーサ３の一方の面と他方の抵抗シート８の抵抗体を備えない面とを予め接着しておくほうが作業をしやすい。 With reference to FIG. 2, the manufacturing method of the electromagnetic wave absorber 11 is demonstrated.
Two gypsum boards 6; 6 forming the first spacer 2; two gypsum boards 6; 6 forming the second spacer 3; and two resistance sheets 8; 8 are prepared. A reflecting portion 5 is provided on the other surface of one gypsum board 6 forming the second spacer 3. One surface of the first spacer 2 in which two surfaces of the gypsum board 6; 6 are overlapped with each other and one surface of the second spacer 3 in which the two surfaces of the gypsum board 6; 6 are overlapped with each other In the state where the resistors of the two resistance sheets 8; 8 formed so as to have a sheet resistance value of 380 ± 60Ω □ are overlapped and installed, the stacked first spacer 2, resistor portion 4, second A through hole 15 penetrating the rectangular body is formed at the corner of the rectangular body formed by the spacer 3, and the nut storage groove is formed around the through hole in the other surface of the first spacer 2 and the other surface of the second spacer 3. 16 is formed. Then, the screw rod 17 is passed through the through hole 15 so as to penetrate the first spacer 2, the resistance portion 4, and the second spacer 3, and nuts 18 are attached to both ends of the screw rod 17, so that the nut 18 is received in the storage groove 16. And conclude. Thereby, the electromagnetic wave absorber 1 in a state where the resistance portion 4 is sandwiched between the first spacer 2 and the second spacer 3 can be formed. The two gypsum boards 6; 6, one side of the first spacer 2 and one side of the resistance sheet 8 not provided with the resistor, one side of the second spacer 3 and the other side of the resistance sheet 8. It is easier to work by pre-bonding the surface without the resistor.

以上のように製造された電磁波吸収体１によれば、ナット１９の締結力によって、２つの抵抗シート８；８の面抵抗値３８０±６０Ω□の抵抗体同士が互いに接触し合って抵抗体のむらを互いに補い合うので、抵抗部４の面抵抗値のばらつきを少なくできる。従って、ばらつきの少ない面抵抗値１９０±３０Ω□の抵抗部４を形成でき、現在の無線ＬＡＮで使用されている２．４５ＧＨｚ帯の電磁波と５．２ＧＨｚ帯の電磁波とを吸収できる高品質の電磁波吸収体１１を得ることができる。   According to the electromagnetic wave absorber 1 manufactured as described above, due to the fastening force of the nut 19, the resistors having the surface resistance value of 380 ± 60Ω □ of the two resistance sheets 8; Therefore, the variation in the sheet resistance value of the resistance portion 4 can be reduced. Therefore, the resistance part 4 having a surface resistance value of 190 ± 30Ω □ with little variation can be formed, and the high-quality electromagnetic wave capable of absorbing the 2.45 GHz band electromagnetic wave and the 5.2 GHz band electromagnetic wave used in the current wireless LAN. The absorber 11 can be obtained.

また、図３（ｂ）のように、スペーサとしての石膏ボード２０の厚さｄを９．５ｍｍとし、石膏ボード２０の一方の面に反射部５を設け、石膏ボード２０の他方の面に面抵抗値３８０±６０Ω□の抵抗シート８を設けることによって、５．２ＧＨｚ帯の電磁波を吸収できる電磁波吸収体１Ａを得ることができる。また、石膏ボード２０の厚さｄを１９ｍｍとし、石膏ボード２０の他方の面に反射部５を設け、石膏ボード２０の一方の面に面抵抗値３８０±６０Ω□の抵抗シート８を設けることによって、２．４５ＧＨｚ帯の電磁波を吸収できる電磁波吸収体１Ａを得ることができる。   Further, as shown in FIG. 3B, the thickness d of the gypsum board 20 as a spacer is set to 9.5 mm, the reflection part 5 is provided on one surface of the gypsum board 20, and the surface on the other surface of the gypsum board 20 is provided. By providing the resistance sheet 8 having a resistance value of 380 ± 60Ω □, it is possible to obtain the electromagnetic wave absorber 1A capable of absorbing the 5.2 GHz band electromagnetic wave. Further, by setting the thickness d of the gypsum board 20 to 19 mm, providing the reflecting portion 5 on the other side of the gypsum board 20, and providing the resistance sheet 8 having a surface resistance value of 380 ± 60Ω □ on one side of the gypsum board 20 An electromagnetic wave absorber 1A that can absorb electromagnetic waves in the 2.45 GHz band can be obtained.

最良の形態１によれば、第１スペーサ２及び第２スペーサ３の互いに対向する一方の面と一方の面との間に抵抗シートを設けた構成の電磁波吸収体１において、ナット１８の締結力で、２つの抵抗シート８；８の抵抗体同士を互いに接触させることによって、抵抗体のむらを互いに補い合わせることができて、抵抗部４の面抵抗値のばらつきを少なくできる。即ち、抵抗部４が、面抵抗値３８０±６０Ω□の二つの抵抗シート８；８の重ね合わせにより形成されたことによって、抵抗部４の面抵抗値をばらつきの少ない面抵抗値１９０±３０Ω□とでき、２．４５ＧＨｚ帯の電磁波と５．２ＧＨｚ帯の電磁波とを吸収できる周波数吸収特性のばらつきの少ない高品質の電磁波吸収体１を得ることができる。   According to the best mode 1, in the electromagnetic wave absorber 1 having a configuration in which a resistance sheet is provided between one surface of the first spacer 2 and the second spacer 3 facing each other, the fastening force of the nut 18 Thus, by bringing the resistors of the two resistor sheets 8; 8 into contact with each other, the unevenness of the resistors can be compensated for each other, and variations in the surface resistance value of the resistor portion 4 can be reduced. That is, the resistance portion 4 is formed by superimposing the two resistance sheets 8; 8 having a surface resistance value of 380 ± 60Ω □, so that the surface resistance value of the resistance portion 4 has a small variation in surface resistance value 190 ± 30Ω □. In addition, it is possible to obtain a high-quality electromagnetic wave absorber 1 that can absorb a 2.45 GHz band electromagnetic wave and a 5.2 GHz band electromagnetic wave with little variation in frequency absorption characteristics.

また、面抵抗値３８０±６０Ω□の抵抗体を備えた一種類の抵抗シート８を用いて、二つの周波数帯の電磁波を吸収できる電磁波吸収体１と単一周波数帯の電磁波を吸収できる電磁波吸収体１Ａとを効率的に生産でき、抵抗シート８の製造や管理を容易とできる。
即ち、二つの平板状の第１；第２スペーサ２；３の互いに対向する一方の面と一方の面との間に、面抵抗値３８０±６０Ω□の二つの抵抗シート８；８を互いに重ね合わせることによって形成された面抵抗値１９０±３０Ω□の抵抗部４を設けるとともに、第２スペーサ３一方の他方の面に反射部５を設けることによって、二つの周波数帯の電磁波を吸収できる第１の電磁波吸収体１を製造できるとともに、第１；第２スペーサ２；３とは別のスペーサとしての石膏ボード２０の他方の面に反射部５を設け、石膏ボード２０の一方の面に面抵抗値３８０±６０Ω□の抵抗シート８を設けることによって、単一周波数帯の電磁波を吸収できる第２の電磁波吸収体１Ａを製造できる。 In addition, by using one type of resistance sheet 8 provided with a resistor having a sheet resistance value of 380 ± 60Ω □, an electromagnetic wave absorber 1 capable of absorbing electromagnetic waves in two frequency bands and an electromagnetic wave absorption capable of absorbing electromagnetic waves in a single frequency band. The body 1A can be efficiently produced, and the resistance sheet 8 can be easily manufactured and managed.
That is, two resistance sheets 8; 8 having a surface resistance value of 380 ± 60 Ω □ are overlapped with each other between the two flat first and second spacers 2; A first portion capable of absorbing electromagnetic waves in two frequency bands is provided by providing the resistance portion 4 having a surface resistance value of 190 ± 30Ω □ formed by combining them and providing the reflection portion 5 on the other surface of the second spacer 3. The electromagnetic wave absorber 1 can be manufactured, and the reflecting portion 5 is provided on the other surface of the gypsum board 20 as a spacer different from the first and second spacers 2 and 3, and the surface resistance is provided on one surface of the gypsum board 20. By providing the resistance sheet 8 having a value of 380 ± 60Ω □, a second electromagnetic wave absorber 1A capable of absorbing electromagnetic waves in a single frequency band can be manufactured.

スペーサは、けい酸カルシウム成形板等、石膏以外の無機系材料により形成されたものでもよい。   The spacer may be formed of an inorganic material other than gypsum, such as a calcium silicate molded plate.

電磁波吸収体を示す斜視図（最良の形態）。本発明の最良の形態による電磁波吸収体を示す斜視図。The perspective view which shows an electromagnetic wave absorber (best form). The perspective view which shows the electromagnetic wave absorber by the best form of this invention. 電磁波吸収体の製造方法を示す図であり、（ａ）は電磁波吸収体の構成要素を分解して示した分解図、（ｂ）は電磁波吸収体の完成品を示す断面図（最良の形態）。It is a figure which shows the manufacturing method of an electromagnetic wave absorber, (a) is the exploded view which decomposed | disassembled and showed the component of the electromagnetic wave absorber, (b) is sectional drawing (best form) which shows the finished product of an electromagnetic wave absorber . １種類の抵抗シートを用いて形成された２種類の電磁波吸収体を示し、（ａ）は二つの周波数帯の電磁波を吸収できる電磁波吸収体を示す図、（ｂ）は単一周波数帯の電磁波を吸収できる電磁波吸収体を示す図（最良の形態）。2 shows two types of electromagnetic wave absorbers formed using one type of resistance sheet, (a) shows an electromagnetic wave absorber that can absorb electromagnetic waves in two frequency bands, and (b) shows electromagnetic waves in a single frequency band. Which shows the electromagnetic wave absorber which can absorb (best form). 従来の電磁波吸収体を示す図。The figure which shows the conventional electromagnetic wave absorber. 従来の電磁波吸収体を示す図。The figure which shows the conventional electromagnetic wave absorber.

符号の説明Explanation of symbols

１ 電磁波吸収体、２ 第１スペーサ、３ 第２スペーサ、４ 抵抗部、
５ 反射部、８ 抵抗シート。 1 electromagnetic wave absorber, 2 first spacer, 3 second spacer, 4 resistance section,
5 reflection part, 8 resistance sheet.

Claims (3)

二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に抵抗部を備えるとともに一方のスペーサの他方の面に反射部を備えた電磁波吸収体において、抵抗部が、面抵抗値３８０±６０Ω□の二つの抵抗シートの重ね合わせにより形成されたことを特徴とする電磁波吸収体。   In an electromagnetic wave absorber having a resistance portion between one surface and the other surface of two flat spacers, and a reflection portion on the other surface of one spacer, the resistance portion has a surface resistance. An electromagnetic wave absorber formed by superposing two resistance sheets having a value of 380 ± 60Ω □. 二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に抵抗部を備えるとともに一方のスペーサの他方の面に反射部を備えた電磁波吸収体の製造方法において、面抵抗値３８０±６０Ω□の二つの抵抗シートを互いに重ね合わせることによって面抵抗値１９０±３０Ω□の抵抗部を形成したことを特徴とする電磁波吸収体の製造方法。   In a method of manufacturing an electromagnetic wave absorber having a resistance portion between one surface and two surfaces of two flat spacers facing each other and a reflection portion on the other surface of one spacer, the surface resistance value A method of manufacturing an electromagnetic wave absorber, wherein a resistance portion having a surface resistance value of 190 ± 30Ω □ is formed by superposing two resistance sheets of 380 ± 60Ω □ on each other. 二つの平板状のスペーサの互いに対向する一方の面と一方の面との間に、面抵抗値３８０±６０Ω□の二つの抵抗シートを互いに重ね合わせることによって形成された面抵抗値１９０±３０Ω□の抵抗部を設けるとともに、一方のスペーサの他方の面に反射部を設けることによって、二つの周波数帯の電磁波を吸収できる第１の電磁波吸収体を製造するとともに、上記スペーサとは別のスペーサの他方の面に反射部を設け、別のスペーサの一方の面に面抵抗値３８０±６０Ω□の抵抗シートを設けることによって、単一周波数帯の電磁波を吸収できる第２の電磁波吸収体を製造したことを特徴とする電磁波吸収体の製造方法。   Surface resistance value 190 ± 30Ω □ formed by superimposing two resistance sheets having surface resistance values of 380 ± 60Ω □ between one surface and two surfaces of two flat spacers facing each other. The first electromagnetic wave absorber capable of absorbing electromagnetic waves in two frequency bands is manufactured by providing a resistance portion of the first spacer and a reflecting portion on the other surface of one spacer, and a spacer different from the spacer is manufactured. A second electromagnetic wave absorber capable of absorbing an electromagnetic wave of a single frequency band was manufactured by providing a reflective portion on the other surface and providing a resistance sheet having a surface resistance value of 380 ± 60Ω □ on one surface of another spacer. The manufacturing method of the electromagnetic wave absorber characterized by the above-mentioned.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012114587A1 (en) * 2011-02-25 2012-08-30 Kagawa Seiji Near-field-noise-suppressing sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012114587A1 (en) * 2011-02-25 2012-08-30 Kagawa Seiji Near-field-noise-suppressing sheet
JP2012178476A (en) * 2011-02-25 2012-09-13 Seiji Kagawa Neighborhood field noise suppression sheet
US8952273B2 (en) 2011-02-25 2015-02-10 Seiji Kagawa Near-field noise suppression sheet

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