Electromagnetic wave absorber
AssigneeHokkaido University, Sapporo-shi, Japan
InventorsKoichi Mukasa, Teruyuki Tsunabuchi, Kazuhisa Sueoka
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Abstract
An electromagnetic wave absorber including: a porous substrate having a large number of pores piercing the porous substrate; and an absorbent film formed on circumferential surfaces of the pores and constituted by a mixture of an electromagnetic wave absorbing filler and an electromagnetic wave absorbing high-molecular material, wherein the pores are not blocked with the absorbent film so that the pores are permeable to gas. Accordingly, the electromagnetic wave absorber is high in electromagnetic wave absorbing performance, can be made thin and lightweight and is so excellent in reliability that the electromagnetic wave absorbing performance can be offered over a very broad range.
Claims16
An electromagnetic wave absorber comprising:
- a porous substrate having a large number of pores piercing the porous substrate;
- and an absorbent film formed on circumferential surfaces of said pores and constituted by a mixture of an electromagnetic wave absorbing filler and an electromagnetic wave absorbing high-molecular material, wherein said pores are not blocked with said absorbent film so that said pores are permeable to gas.
An electromagnetic wave absorber comprising:
- a porous substrate having a large number of pores piercing the porous substrate;
- and incombustible or flame-retardant particles having pores into which filamentary carbon adheres, said pores of said porous substrate being filled with said incombustible or flame-retardant particles.
An electromagnetic wave absorber comprising:
- a porous substrate having a large number of pores piercing the porous substrate;
- an absorbent film formed on circumferential surfaces of said pores and constituted by a mixture of an electromagnetic wave absorbing filler and an electromagnetic wave absorbing high-molecular material;
- and incombustible or flame-retardant particles having pores into which filamentary carbon adheres, said absorbent film-coated pores of said porous substrate being filled with said incombustible or flame-retardant particles.
Dependencies are inferred from the claim text.