JP4145174B2 - Radio wave absorber - Google Patents
Radio wave absorber Download PDFInfo
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- JP4145174B2 JP4145174B2 JP2003074023A JP2003074023A JP4145174B2 JP 4145174 B2 JP4145174 B2 JP 4145174B2 JP 2003074023 A JP2003074023 A JP 2003074023A JP 2003074023 A JP2003074023 A JP 2003074023A JP 4145174 B2 JP4145174 B2 JP 4145174B2
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- radio wave
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- wave absorber
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- dielectric
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- 239000006096 absorbing agent Substances 0.000 title claims description 27
- 238000010521 absorption reaction Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000003989 dielectric material Substances 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 40
- 238000005259 measurement Methods 0.000 description 7
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 239000003273 ketjen black Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- -1 wire mesh Substances 0.000 description 1
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- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【０００１】
【発明の属する技術分野】
この発明は、電波吸収体に係わり、更に詳しくは誘電体層と電波反射層とを積層させた整合型の電波吸収体の表面に光反射層を設けた電波吸収体に関するものである。
【０００２】
【従来の技術】
近年、自動車の走行支援道路システム（ＡＨＳ：Advanced Cruise-Assist Highway System)では、路車間通信や車々間通信の電磁波を利用して行われており、この走行支援道路システムを目的とした路車間通信ゾーン内において、道路付帯設備に電波吸収性能を具備させた発明が提案されている（例えば、特許文献１参照。）
【０００３】
【特許文献１】
特開２００２−６１１３０号公報（第７〜第８頁、図４（イ）〜（ハ））
【０００４】
【発明が解決しようとする課題】
上記走行支援道路システムにおける車間距離測定用の自動車車載レーダにおいては、道路付帯設備としての道路標識やガードレール等からの電波の散乱波により電波障害が発生する可能性がある。しかし、現在の道路付帯設備には、光の反射機能と電波吸収機能を併せもつものは存在しない。
【０００５】
この発明はかかる従来の問題点に着目し、道路付帯設備としての道路標識等に、光の反射機能と電波吸収機能とを具備させた電波吸収体を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
この発明は上記目的を達成するため、誘電体層と電波反射層とを積層させて電波吸収層を構成して成る電波吸収体において、電波吸収層の電波到来方向となる前記誘電体の表面に、電波を透過する材料で構成された光反射層を接着剤を介して一体的に配設し、前記誘電体を熱硬化性樹脂の基材に、導電性酸化チタン及び／または導電性カーボンブラックを配合した組成物で構成し、前記電波反射層を金網で構成したことを要旨とするものである。
【０００７】
ここで、周波数６０ＧＨｚおよび７６ＧＨｚの２つの周波数において、電波吸収性能がピークを有するように設定することもできる。また、前記誘電体層は、電気的な特性に対応して任意の厚さに形成することもできる。
【０００８】
このように、電波吸収層の電波到来方向となる誘電体の表面に、電波を透過する材料で構成された光反射層を接着剤を介して一体的に配設したことにより、道路付帯設備としての道路標識等に、光の反射機能と電波吸収機能とを具備させることが可能となり、電波の散乱波による電波障害を有効に防止することが出来るものである。
【０００９】
【発明の実施の形態】
以下、添付図面に基づき、この発明の実施形態を説明する。
【００１０】
図１は、この発明を実施した電波吸収体の断面図を示し、この電波吸収体１は、誘電体層２と電波反射層３とを積層させて電波吸収層４を構成し、この電波吸収層の電波到来方向Ｘの表面層、即ち、誘電体層２の表面に接着剤等を介して光反射層５を設けて一体的に構成してある。
【００１１】
前記光反射層５としては、電波を透過する材料、例えば、住友スリーエム社製のスコッチライト反射シート（商標名）6060ホワイトを使用し、誘電体層２の材料としては、例えば、導電性酸化チタン（石原産業（株）製：FT-2000)及び／または導電性カーボンブラック（日本イーシー社製，商品名「ケッチェンブラック」）を基材に配合した組成物で構成し、基材としては、熱硬化性樹脂（例えば、エポキシ樹脂、ポリウレタン樹脂、ポリエステル樹脂、フェノール樹脂、等の中から適宜選ばれる）を使用する。
【００１２】
更に電波反射層３の材料としては、電波を全反射する金属製の板状部材（例えば、アルミニム板等）の他、アルミニム箔，金網，金属蒸着膜、導電性インク塗布材等を使用することができ、本発明では金網を使用するものである。
【００１３】
図２は、車間距離測定用レーダの使用周波数として想定される６０GHz （第１実施例）または７６GHz （第２実施例）で電波吸収性能を発揮できるように構成した電波吸収体の電波吸収性能〔ｄＢ〕の測定結果を示している。
【００１４】
第１実施例の６０GHz 対応の電波吸収体の構成としては、基材（エポキシ樹脂）に配合する導電性酸化チタンの配合量は、8.6(phr) 、ケッチェンブラックの配合量は、1.1(phr)、誘電体層２の厚さは、1.4(mm) 、光反射層５（住友スリーエム社製のスコッチライト反射シート（商標名）6060ホワイト）の厚さは、0.3mm としたものである。
【００１５】
また第２実施例の７６GHz 対応の電波吸収体の構成としては、基材（エポキシ樹脂）に配合する導電性酸化チタンの配合量は、4.0(phr) 、ケッチェンブラックの配合量は、1.6(phr)、誘電体層２の厚さは、1.2(mm) 、光反射層５（住友スリーエム社製のスコッチライト反射シート（商標名）6060ホワイト）の厚さは、0.3mm としたものである。
【００１６】
このような構成から成る第１実施例及び第２実施例の電波吸収体１の電波吸収性能を、反射電力法で５０〜１１０GHz において、入射角度４°、ＴＥ波（偏波）で測定した結果、図２に示すような測定結果を得ることが出来た。 即ち、図２から明らかなように、吸収性能の最大値を示す周波数に若干の差異があるももの、６０GHz または７６GHz に対応の電波吸収性体を得ることが出来ることが確認できた。
【００１７】
また、図３及び図４は、この発明の第３実施例と第４実施例を示し、この実施例は、車間距離測定用レーダの使用周波数として想定される６０GHz と７６GHz とに対応できる電波吸収体の電波吸収性能〔ｄＢ〕の測定結果を示している。
【００１８】
図３に示す第３実施例は、基材（エポキシ樹脂）に配合する導電性酸化チタンの配合量は、4.9(phr) 、誘電体層２の厚さは、4.34(mm)、光反射層５（住友スリーエム社製のスコッチライト（商標名）９８３−１０）の厚さは、0.45mmとしたものである。
【００１９】
図４に示す第３実施例は、基材（エポキシ樹脂）に配合する導電性酸化チタンの配合量は、9.1(phr)、ケッチェンブラックの配合量は、1.0(phr)、誘電体層２の厚さは、3.85(mm)、光反射層５（住友スリーエム社製のスコッチライト（商標名）３９２４Ｇ）の厚さは、0.55mmとしたものである。
【００２０】
このような構成から成る第３実施例及び第４実施例の電波吸収体１の電波吸収性能を、反射電力法で５０〜１１０GHz において、入射角度４°、ＴＥ波（偏波）で測定した結果、図３及び図面４に示すような測定結果を得ることが出来た。即ち、図３及び図４から明らかなように、吸収性能の最大値を示す周波数に若干の差異があるももの、６０GHz と７６GHz との両周波数に対応した電波吸収性体を得ることが出来ることが確認できた。
【００２１】
上記電波吸収体を道路付帯設備としての道路標識、ガードレール、識別標識等に接着剤等を介して設置することが出来る。
【００２２】
以上のように、電波吸収層３の電波到来方向Ｘの表面層に光反射層５を設けたことにより、道路付帯設備としての道路標識等に、光の反射機能と電波吸収機能とを具備させることが可能となり、電波の散乱波による電波障害を有効に防止することが出来る。
【００２３】
【発明の効果】
この発明は、上記のように誘電体層と電波反射層とを積層させて電波吸収層を構成して成る電波吸収体において、電波吸収層の電波到来方向となる誘電体の表面に、電波を透過する材料で構成された光反射層を接着剤を介して一体的に配設したので、例えば、道路付帯設備としての道路標識等に、光の反射機能と電波吸収機能とを具備させることが可能となり、電波の散乱波による電波障害を有効に防止することが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施した電波吸収体の断面図である。
【図２】この発明の第１実施例及び第２実施例における電波吸収体の吸収性能の測定結果を示すグラフ説明図である。
【図３】この発明の第３実施例における電波吸収体の吸収性能の測定結果を示すグラフ説明図である。
【図４】この発明の第４実施例における電波吸収体の吸収性能の測定結果を示すグラフ説明図である。
【符号の説明】
１ 電波吸収体 ２ 誘電体層
３ 電波反射層 ４ 電波吸収層
５ 光反射層 Ｘ 電波到来方向[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio wave absorber, and more particularly to a radio wave absorber in which a light reflection layer is provided on the surface of a matching type radio wave absorber in which a dielectric layer and a radio wave reflection layer are laminated.
[0002]
[Prior art]
In recent years, the Advanced Cruise-Assist Highway System (AHS) of automobiles has been performed using electromagnetic waves of road-to-vehicle communication and inter-vehicle communication, and a road-to-vehicle communication zone for the purpose of this driving support road system. In particular, an invention in which a road incidental facility is provided with radio wave absorption performance has been proposed (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-61130 (7th to 8th pages, FIGS. 4 (a) to (c))
[0004]
[Problems to be solved by the invention]
In the vehicle-mounted radar for measuring the distance between vehicles in the driving support road system, there is a possibility that radio wave interference may occur due to scattered waves of radio waves from road signs, guardrails, etc. as road incidental facilities. However, there is no existing road incidental facility that has both a light reflection function and a radio wave absorption function.
[0005]
An object of the present invention is to provide a radio wave absorber having a light reflection function and a radio wave absorption function provided on a road sign or the like as a road incidental facility, paying attention to such conventional problems.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a radio wave absorber formed by laminating a dielectric layer and a radio wave reflection layer to form a radio wave absorption layer, on the surface of the dielectric material in the radio wave arrival direction of the radio wave absorption layer. A light reflecting layer made of a material that transmits radio waves is integrally disposed via an adhesive, and the dielectric is formed on a thermosetting resin base material with conductive titanium oxide and / or conductive carbon black. And the radio wave reflection layer is composed of a wire mesh .
[0007]
Here, it is possible to set the radio wave absorption performance to have a peak at two frequencies of 60 GHz and 76 GHz. The dielectric layer can be formed to have an arbitrary thickness corresponding to the electrical characteristics.
[0008]
In this way, the light reflecting layer made of a material that transmits radio waves is integrally disposed on the surface of the dielectric material in the radio wave arrival direction of the radio wave absorption layer with an adhesive, so that it can be used as a road incidental facility. The road sign or the like can be provided with a light reflection function and a radio wave absorption function, so that radio wave interference due to radio wave scattered waves can be effectively prevented.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0010]
FIG. 1 shows a cross-sectional view of a radio wave absorber embodying the present invention. This radio wave absorber 1 comprises a radio wave absorption layer 4 formed by laminating a dielectric layer 2 and a radio wave reflection layer 3. The light reflecting layer 5 is provided on the surface layer of the layer in the radio wave arrival direction X, that is, the surface of the dielectric layer 2 with an adhesive or the like, and is integrally configured.
[0011]
The light reflecting layer 5 is made of a material that transmits radio waves, for example, Scotch Light Reflecting Sheet (trade name) 6060 White manufactured by Sumitomo 3M Limited. The material of the dielectric layer 2 is, for example, conductive titanium oxide. (Ishihara Sangyo Co., Ltd. product: FT-2000) and / or conductive carbon black (manufactured by Nippon EC Co., Ltd., trade name “Ketjen Black”) is composed of a composition blended with a base material. A thermosetting resin (for example, appropriately selected from an epoxy resin, a polyurethane resin, a polyester resin, a phenol resin, etc.) is used.
[0012]
Yet the material of the radio wave reflecting layer 3, a metal plate member for totally reflecting radio waves (e.g., Aruminimu plate, etc.) other, using Aruminimu foil, wire mesh, metal evaporated film, a conductive ink coating material or the like In the present invention, a wire mesh is used.
[0013]
FIG. 2 shows the radio wave absorption performance of a radio wave absorber configured to be able to exhibit radio wave absorption performance at 60 GHz (first embodiment) or 76 GHz (second embodiment) assumed as a use frequency of the inter-vehicle distance measurement radar. dB] is shown.
[0014]
The structure of the 60 GHz-compatible radio wave absorber of the first embodiment is as follows. The conductive titanium oxide compounded in the base material (epoxy resin) is 8.6 (phr), and the ketjen black compound is 1.1 (phr). ), The thickness of the dielectric layer 2 is 1.4 (mm), and the thickness of the light reflecting layer 5 (Scotchlite reflecting sheet (trade name: 6060 white, manufactured by Sumitomo 3M)) is 0.3 mm.
[0015]
In addition, as the constitution of the 76 GHz-compliant radio wave absorber of the second embodiment, the blending amount of conductive titanium oxide blended with the base material (epoxy resin) is 4.0 (phr), and the blending amount of Ketjen Black is 1.6 ( phr), the thickness of the dielectric layer 2 is 1.2 (mm), and the thickness of the light reflecting layer 5 (Scotchlite reflecting sheet (trade name) 6060 white manufactured by Sumitomo 3M) is 0.3 mm. .
[0016]
As a result of measuring the radio wave absorption performance of the radio wave absorber 1 of the first and second embodiments having such a configuration by the reflected power method at an incident angle of 4 ° and a TE wave (polarized wave) at 50 to 110 GHz. The measurement results as shown in FIG. 2 were obtained. That is, as is clear from FIG. 2, it was confirmed that a radio wave absorber corresponding to 60 GHz or 76 GHz can be obtained even though there is a slight difference in the frequency indicating the maximum value of the absorption performance.
[0017]
FIGS. 3 and 4 show a third embodiment and a fourth embodiment of the present invention. This embodiment is a radio wave absorber capable of dealing with 60 GHz and 76 GHz assumed as the operating frequencies of the inter-vehicle distance measuring radar. The measurement result of the radio wave absorption performance [dB] of the body is shown.
[0018]
In the third embodiment shown in FIG. 3, the amount of conductive titanium oxide compounded in the base material (epoxy resin) is 4.9 (phr), the thickness of the dielectric layer 2 is 4.34 (mm), and the light reflecting layer. 5 (Scotchlite (trade name) 983-10 manufactured by Sumitomo 3M) was 0.45 mm.
[0019]
In the third embodiment shown in FIG. 4, the amount of conductive titanium oxide compounded in the base material (epoxy resin) is 9.1 (phr), the amount of ketjen black is 1.0 (phr), and the dielectric layer 2 The thickness of the light reflecting layer 5 (Scotchlite (trade name) 3924G manufactured by Sumitomo 3M) is 0.55 mm.
[0020]
Results of measuring the radio wave absorption performance of the radio wave absorbers 1 of the third and fourth embodiments having such a configuration by the reflected power method at an incident angle of 4 ° and a TE wave (polarized wave) at 50 to 110 GHz. The measurement results as shown in FIGS. 3 and 4 were obtained. That is, as is clear from FIGS. 3 and 4, it is possible to obtain a radio wave absorber corresponding to both the frequencies of 60 GHz and 76 GHz although there is a slight difference in the frequency indicating the maximum value of the absorption performance. Was confirmed.
[0021]
The radio wave absorber can be installed on a road sign, guardrail, identification sign or the like as a road incidental facility through an adhesive or the like.
[0022]
As described above, by providing the light reflection layer 5 on the surface layer of the radio wave absorption layer 3 in the radio wave arrival direction X, a road sign as a road incidental facility has a light reflection function and a radio wave absorption function. Therefore, it is possible to effectively prevent radio interference caused by scattered radio waves.
[0023]
【The invention's effect】
According to the present invention, in the radio wave absorber formed by laminating the dielectric layer and the radio wave reflection layer as described above to constitute the radio wave absorption layer, the radio wave is applied to the surface of the dielectric material in the radio wave arrival direction of the radio wave absorption layer. Since the light reflecting layer made of a transparent material is integrally disposed via an adhesive , for example, a road sign as a road incidental facility may be provided with a light reflecting function and a radio wave absorbing function. It is possible to effectively prevent radio wave interference caused by scattered radio waves.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a radio wave absorber implementing the present invention.
FIG. 2 is a graph explanatory view showing the measurement results of the absorption performance of the radio wave absorber in the first and second embodiments of the present invention.
FIG. 3 is an explanatory graph showing the measurement results of the absorption performance of the radio wave absorber according to the third embodiment of the present invention.
FIG. 4 is a graph explanatory view showing the measurement results of the absorption performance of the radio wave absorber in the fourth embodiment of the invention.
[Explanation of symbols]
1 Radio wave absorber 2 Dielectric layer 3 Radio wave reflection layer 4 Radio wave absorption layer 5 Light reflection layer X Radio wave arrival direction
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003074023A JP4145174B2 (en) | 2003-03-18 | 2003-03-18 | Radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003074023A JP4145174B2 (en) | 2003-03-18 | 2003-03-18 | Radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004278226A JP2004278226A (en) | 2004-10-07 |
| JP4145174B2 true JP4145174B2 (en) | 2008-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003074023A Expired - Fee Related JP4145174B2 (en) | 2003-03-18 | 2003-03-18 | Radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4145174B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006165178A (en) * | 2004-12-06 | 2006-06-22 | Konoshima Chemical Co Ltd | Nonflammable wave absorbing plate and nonflammable wave absorbing laminated plate |
| JP4669938B2 (en) * | 2005-05-19 | 2011-04-13 | 名古屋電機工業株式会社 | Radio wave reflector for detecting road surface condition and method for forming the same |
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2003
- 2003-03-18 JP JP2003074023A patent/JP4145174B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2004278226A (en) | 2004-10-07 |
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