| 摘要 |
PROBLEM TO BE SOLVED: To provide transmissive radio wave absorption equipment which prevents reflected waves with respect to the incident angle of a wide range in the incident wave. SOLUTION: In a plurality of laminated radio wave absorption layers, a dielectric layer is arranged on the incident side of a radio wave, and an impedance layer on a transmission-side. A specific dielectric constant of the dielectric layer arranged in the radio wave absorption layer installed in a pre-stage of the incident side of the radio wave rather than the prescribed radio wave absorption layer is smaller than that of the dielectric layer disposed in the prescribed radio wave absorption layer. When the wavelength of the incident radio wave is set to beλ<SB>0</SB>, the specific dielectric constant of the dielectric layer in the respective radio wave absorption layers to beε<SB>r</SB>and peculiar impedance in regions on the incident side, and a transmission-side to be Z<SB>0</SB>; thickness (d) of the dielectric layers and impedance Z<SB>s</SB>of the respective impedance layers are calculated by d=λ<SB>0</SB>/[4(<SB>εr</SB>)<SP>1/2</SP>] and Z<SB>s</SB>=Z<SB>0</SB>/(ε<SB>r</SB>-Z<SB>0</SB>/Z<SB>3</SB>). COPYRIGHT: (C)2004,JPO&NCIPI
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