JPWO2020067145A1 - λ/4型電波吸収体 - Google Patents
λ/4型電波吸収体 Download PDFInfo
- Publication number
- JPWO2020067145A1 JPWO2020067145A1 JP2020504418A JP2020504418A JPWO2020067145A1 JP WO2020067145 A1 JPWO2020067145 A1 JP WO2020067145A1 JP 2020504418 A JP2020504418 A JP 2020504418A JP 2020504418 A JP2020504418 A JP 2020504418A JP WO2020067145 A1 JPWO2020067145 A1 JP WO2020067145A1
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- Prior art keywords
- radio wave
- dielectric layer
- support
- wave absorber
- layer
- 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.)
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
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Abstract
Description
式(1):−0.375x+1086.9 < y <−0.375x+1140
(式中、xは抵抗被膜の抵抗値、yは、y=支持体の厚み×(支持体比誘電率)0.5+誘電体層の厚み×(誘電体層の比誘電率)0.5を表す。)
収体。
支持体は、シート状のものである限り、特に制限されない。支持体としては、特に制限されないが、例えば樹脂基材が挙げられる。支持体により、抵抗皮膜を保護することができ、電波吸収体としての耐久性を高めることが可能である。
その場合、樹脂基材中の樹脂の合計量は、例えば80質量%以上、好ましくは90質量%以上、より好ましくは95質量%以上、さらに好ましくは99質量%以上であり、通常100質量%未満である。
抵抗皮膜は、電波吸収体において抵抗層として機能し得るものである限り特に制限されない。
抵抗皮膜としては、例えば酸化インジウムスズ(以下「ITO」とする)が用いられる。なかでも、非晶質構造が極めて安定であり、高温多湿の環境下においても抵抗皮膜のシート抵抗の変動を抑えることができる点から、20〜40重量%のSnO2、より好ましくは25〜35重量%のSnO2を含有するITOを含有する(抵抗皮膜中、例えば50質量%以上、好ましくは70質量%以上、より好ましくは90質量%以上、さらに好ましくは95質量%以上であり、通常100質量%未満である。)ものが好ましく用いられる。
抵抗皮膜としては、耐久性、抵抗率の調整が容易である観点から、モリブデンを含有する抵抗皮膜が好ましく用いられる。モリブデンの含有量の下限は特に限定されないが、より耐久性を高める観点から、5重量%が好ましく、7重量%がより好ましく、9重量%が更に好ましく、11重量%がより更に好ましく、13重量%が特に好ましく、15重量%が非常に好ましく、16重量%が最も好ましい。また、上記モリブデンの含有量の上限は、表面抵抗値の調整の容易化の観点から、30重量%が好ましく、25重量%がより好ましく、20重量%が更に好ましい。
誘電体層は、電波吸収体において目的の波長に対して誘電体として機能し得るものである限り、特に制限されない。誘電体層としては、特に制限されないが、例えば樹脂シート、粘着剤等が挙げられる。
反射層は、電波吸収体において電波の反射層として機能し得るものである限り、特に制限されない。反射層としては、特に制限されないが、例えば金属膜が挙げられる。
本発明の電波吸収体においては、各層は、電波吸収性能を発揮することができる順に配置される。一例として、支持体、抵抗皮膜、誘電体層、及び反射層は、この順に配置される。
バリア層は、抵抗皮膜を保護し、その劣化を抑えることができる層である限り、特に制限されない。バリア層の素材としては、例えば金属化合物、半金属化合物、好ましくは金属又は半金属の酸化物、窒化物、窒化酸化物等が挙げられる。バリア層は、本発明の効果が著しく損なわれない限りにおいて、上記素材以外の成分が含まれていてもよい。その場合、バリア層中の上記素材量は、例えば80質量%以上、好ましくは90質量%以上、より好ましくは95質量%以上、さらに好ましくは99質量%以上であり、通常100質量%未満である。
本発明の電波吸収体は、式(1):−0.375x+1086.9 < y <−0.375x+1140(式中、xは抵抗被膜の抵抗値、yは、y=支持体の厚み×(支持体比誘電率)0.5+誘電体層の厚み×(誘電体層の比誘電率)0.5を表す。)を満たす。これにより、支持体、抵抗皮膜、誘電体層、及び反射層を有し、且つより高い電波吸収性を発揮することができる。
本発明の電波吸収体は、例えば支持体上に抵抗皮膜、誘電体層、及び反射層を順に積層させる工程を含む方法により、得ることができる。別の方法としては、誘電体層の一方の面に抵抗皮膜を積層・形成する工程、抵抗皮膜の誘電体層と接する面とは他方の面に支持体を積層させる工程、誘電体層の抵抗皮膜と接する面とは他方の面に反射層を積層させる工程を含む方法により、得ることができる。
本発明は、その一態様において、支持体、抵抗皮膜及び誘電体層を有し、且つ下記式(1)を満たす、λ/4型電波吸収体用部材[式(1):−0.375x+1086.9 < y <−0.375x+1140(式中、xは抵抗被膜の抵抗値、yは、y=支持体の厚み×(支持体比誘電率)0.5+誘電体層の厚み×(誘電体層の比誘電率)0.5を表す。)]に関する。
λ/4型電波吸収体用部材は、誘電体層を金属等の反射層として機能しうる被着体に接するように配置することによりλ/4型電波吸収体を形成するための部材である。支持体、抵抗被膜、誘電体層、本発明の特性、その他の構成については、本発明のλ/4型電波吸収体に関する説明と同様である。
本発明の電波吸収体は、不要な電磁波を吸収する性能を有するため、例えば自動車衝突防止システムに用いるミリ波レーダの電磁波吸収体に好適に利用できる。また、その他の用途として自動車、道路、人の相互間で情報通信を行う高度道路交通システム(ITS)やミリ波を用いた次世代移動通信システム(5G)においても、電波干渉抑制やノイズ低減の目的で用いることができる。
(実施例1)
支持体として、厚み25μmの酸化チタンを練りこんだポリエチレンテレフタレート(PET)フィルム(TiO210%含有、比誘電率3.2)を用意した。上記PETフィルム上に、DCパルススパッタリングにより、厚み10nm且つ抵抗値380Ω/□の抵抗皮膜を形成した。スパッタリングは合金(組成:モリブデン16.4重量%、ニッケル_55.2重量%、クロム18.9重量%、鉄5.5重量%、タングステン3.5重量%、シリカ 0.5重量%、)をターゲットに用い、出力0.4kW、Arガス流量100sccmで導入して圧力0.12Paとなるように調整して行った。次いで、形成した抵抗皮膜上に粘着テープ(アクリル両面粘着テープ、厚み30μm、比誘電率2.6)を介して厚み500μm且つ比誘電率2.7のポリカーボネートからなる誘電体を積層し、更に誘電体上に粘着テープを介して厚さ10μmのアルミニウムからなる反射層(誘電体層側の表面粗さRz=3.2)を積層してλ/4型電波吸収体を得た。
支持体比誘電率、支持体厚み、抵抗皮膜の抵抗値、誘電体の比誘電率、誘電体の厚み等を表1及び表2のとおりに変更する以外は、実施例1と同様にしてλ/4型電波吸収体を得た。
誘電体層を基材レスのアクリル両面粘着テープ(厚み500μm、比誘電率2.4)とし、支持体比誘電率、支持体厚み、抵抗被膜の抵抗値等を表1の通りに変更する以外は実施例1と同様にしてλ/4型電波吸収体を得た。すなわち、実施例10においては「支持体/抵抗被膜/誘電体層(アクリル粘着テープ)/反射層」の構成を有する。
支持体比誘電率、支持体厚み、抵抗皮膜の抵抗値、誘電体の比誘電率、誘電体の厚み等を表3のとおりに変更する以外は、実施例10と同様にしてλ/4型電波吸収体を得た。
反射層のそれぞれの表面における表面粗さを表4の通りに変更する以外は実施例2と同様にしてλ/4型電波吸収体を得た。
支持体として、厚み25μmの酸化チタンを練りこんだポリエチレンテレフタレート(PET)フィルム(TiO2 20%含有、比誘電率3.4)を用いて、反射層のそれぞれの表面における表面粗さを表4の通りに変更する以外は実施例2と同様にして、λ/4型電波吸収体を得た。
PNAマイクロ波ネットワーク・アナライザ N5227A(キーサイト社製)、PNA−Xシリーズ2ポート用ミリ波コントローラ N5261A(キーサイト社製)、ホーンアンテナ FSS−07(HVS社製)を用いて電波吸収測定装置を構成した。この電波吸収測定装置を用いて、得られたλ/4型電波電磁波吸収体のWバンド(75〜110GHz)での電波吸収量をJIS R1679に基づいて測定した。なお、λ/4型電波吸収体は、電波入射方向が垂直かつ、支持体側からの入射となるようにセットした。得られた吸収量について、以下の評価基準にて電磁波吸収性能を評価した。
◎:吸収量が30dB以上
○:吸収量が30dB未満、20dBdb以上
×:吸収量が20dB未満、15以上
××:吸収量が15dB未満。
(3−1)粘着力(誘電体層/反射層)の評価
得られた電波吸収体を10mm幅の短冊状に裁断して試験片を作製し、誘電体層の反射層に面する側とは反対側を露出させた。露出した面を、両面粘着テープ(9708、3M社製)により、測定装置の台座に固定した。この試験サンプルの反射層をJIS Z0237に準じて、剥離速度300mm/分で180°方向の引張試験を行い、180°粘着力(N/10mm)を測定した。誘電体層/反射層間の粘着力が5N/10mm以上を〇、5N/10mm未満を×とする。
得られた電波吸収体を10mm幅の短冊状に裁断して試験片を作製し、反射層の誘電体に面する側を露出させた。次に反射層の誘電体に面していた側とは反対の面に、10mm幅の短冊状の両面粘着テープ(9708、3M社製)を貼付した。両面粘着テープの他方の面を介して、測定装置の台座に固定した。この反射層をJIS Z0237に準じて、剥離速度300mm/分で180°方向の引張試験を行い、180°粘着力(N/10mm)を測定した。粘着力が5N/10mm以上を〇、5N/10mm未満を×とする。
2 抵抗皮膜
3 誘電体層
4 反射層
5 粘着剤層
6 筐体
Claims (11)
- 支持体、抵抗皮膜、誘電体層、及び反射層を有し、且つ下記式(1)を満たす、λ/4型
電波吸収体。
式(1):−0.375x+1086.9 < y <−0.375x+1140
(式中、xは抵抗被膜の抵抗値、yは、y=支持体の厚み×(支持体比誘電率)0.5+誘電体層の厚み×(誘電体層の比誘電率)0.5を表す。) - 前記抵抗被膜の抵抗値が200Ω/□以上500Ω/□以下である、請求項1記載のλ/4型電波吸収体。
- 前記誘電体層の比誘電率が1以上10以下である、請求項1又は2に記載のλ/4型電波吸収体。
- 前記支持体の厚みが15μm以上200μm以下である、請求項1〜3いずれかに記載のλ/4型電波吸収体。
- 前記支持体の比誘電率が1以上10以下である、請求項1〜4いずれかに記載のλ/4型電波吸収体。
- 前記抵抗被膜が、モリブデンを含有する、請求項1〜5いずれかに記載のλ/4型電波吸収体。
- 前記抵抗被膜が、さらにニッケル及びクロムを含有する、請求項6に記載のλ/4型電波吸収体。
- 前記誘電体層が、粘着剤層を含む、請求項1〜7いずれかに記載のλ/4型電波吸収体。
- 前記抵抗被膜の少なくとも一方の表面上に、さらにバリア層を有する、請求項1〜8いずれかに記載のλ/4型電波吸収体。
- 前記反射層の誘電体層側の表面における表面粗さ(Rz)が1μm以上10μm以下である、請求項1〜9いずれかに記載のλ/4型電波吸収体。
- 支持体、抵抗皮膜及び誘電体層を有し、且つ下記式(1)を満たす、λ/4型電波吸収体用部材。[式(1):−0.375x+1086.9 < y <−0.375x+1140(式中、xは抵抗被膜の抵抗値、yは、y=支持体の厚み×(支持体比誘電率)0.5+誘電体層の厚み×(誘電体層の比誘電率)0.5を表す。)]
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