To easily obtain excellent reflection attenuating characteristics by continuously arranging magnetic materials, and making it unnecessary to provide any gap for which precision is required by arranging a second magnetic material having specific magnetic field component directional length and specific electric field component directional width at a gap part between the first magnetic materials in the radio magnetic field component direction.
A continuous part F is formed of first magnetic material plates 1 with prescribed thickness at the center of a vertical direction, and second magnetic materials 2 are connected with the upper and lower parts, and the continuous D formed of the first magnetic material plates 1 are formed at the upper and lower parts so that a wave absorbing panel can be constituted. The first and second magnetic materials are constituted of Ni-Zn-Cu system ferrite materials with prescribed complex magnetic permeability. The length of the second magnetic material 2 is set so as to be 5% of the length of the continuous part F or less, and to be 50% of the width of the first magnetic material 1 or less so that the adjustable width of the resonance frequencies can be increased, and desired wave absorbing characteristics can be obtained by adjusting this width. Thus, a wave absorbing disc with excellent reflection attenuating characteristics in a wide frequency range can be obtained by the simple array of the magnetic materials.
TAMAKAI TOSHIYUKI
FUKUDA KUNIO
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