PAVING MATERIAL FOR ABSORBING ELECTROMAGNETIC WAVE AND PAVEMENT STRUCTURE USING IT

Title:

PAVING MATERIAL FOR ABSORBING ELECTROMAGNETIC WAVE AND PAVEMENT STRUCTURE USING IT

Document Type and Number:

WIPO Patent Application WO/2003/031722

Kind Code:

A1

Abstract:

A base material is admixed with an electromagnetic wave absorber of conductive fibers, e.g. carbon fibers, each having an overall length corresponding to the wavelength of an electromagnetic wave to be absorbed thus composing a paving material for absorbing electromagnetic wave. A paving structure having a layer for absorbing electromagnetic wave is formed using that paving material for absorbing electromagnetic wave. Furthermore, an electromagnetic wave reflective layer is arranged beneath the layer for absorbing electromagnetic wave and set with a specified electric length in relation with the permittivity so that the electromagnetic waves reflected off the surface and off the electromagnetic wave reflective layer have inverse phases and are canceled each other thus absorbing electromagnetic wave well. When the paving structure having a layer for absorbing electromagnetic wave is arranged such that the means permittivity along a plane orthogonal to the thickness direction thereof increases from the surface side toward the rear side, the electromagnetic wave easily intrudes a part on the surface side of a surface layer formed of paving material for absorbing electromagnetic wave. Since the electromagnetic wave reflected directly (direct reflection wave) off the surface of the surface layer formed of the paving material for absorbing electromagnetic wave is decreased and the ratio of electromagnetic wave impinging on the surface layer formed of the paving material for absorbing electromagnetic wave is increased, the electromagnetic wave is absorbed effectively by the layer for absorbing electromagnetic wave.

Inventors:

SAITO TOSHIO (JP)
HARAKAWA KENICHI (JP)
WAKINAKA YOSHITAKA (JP)
KUNISHIMA TAKESHI (JP)
YOSHIMURA KENICHI (JP)
FUJII YOSHIFUMI (JP)
ANDOH SHIN-ICHIRO (JP)
IWATA TAKEO (JP)
SATOU MASAKAZU (JP)

Application Number:

PCT/JP2001/008532

Publication Date:

April 17, 2003

Filing Date:

September 28, 2001

Export Citation:

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Assignee:

TAKENAKA CORP (JP)
TAKENAKA ROAD CONSTRUCTION CO (JP)
TAKENAKA CIVIL ENGINEERING & C (JP)
SAITO TOSHIO (JP)
HARAKAWA KENICHI (JP)
WAKINAKA YOSHITAKA (JP)
KUNISHIMA TAKESHI (JP)
YOSHIMURA KENICHI (JP)
FUJII YOSHIFUMI (JP)
ANDOH SHIN-ICHIRO (JP)
IWATA TAKEO (JP)
SATOU MASAKAZU (JP)

International Classes:

E01C7/00; E01C9/00; E01C11/16; H01Q17/00; (IPC1-7): E01C7/26; E01F9/00; H01Q17/00

Foreign References:

JPH11204985A	1999-07-30
JPH05327267A	1993-12-10
JPH10322080A	1998-12-04
JP2000138491A	2000-05-16
JPH04163998A	1992-06-09
JP2001077586A	2001-03-23
JPS63305597A	1988-12-13
JPS6221103U	1987-02-07
JPH041304A	1992-01-06
JPS6436804A	1989-02-07
FR1481906A	1967-05-26

Other References: