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AssigneeHitachi, Ltd.
InventorsTadashi Fujieda, Kishio Hidaka, Shinzou Ikeda, Mitsuo Hayashibara, Noriyuki Taguchi
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The purpose of the present invention is to provide an easy-to-manufacture electromagnetic wave absorption material usable from submillimeter wave region to millimeter wave region with an excellent radio wave absorbing performance and a variety of usage thereof. The present invention is characterized by an electromagnetic wave absorption material comprised of a dispersions of at least one of the materials: a multi-layer hollow globule of carbon, a schungite carbon, and the schungite ore; mixed into a matter having a high electrical resistivity. The invention is further characterized by an electronic device, an optical transmission module, an optical reception module, a high frequency telecommunication equipment, and a stop-free automated tollgate system, wherein at least a part of their board, electronic element, and circuit wiring are covered with said electromagnetic wave absorption material.
Electromagnetic wave absorption material comprising a multi-layer hollow globule of carbon.
Electromagnetic wave absorption material comprising a multi-layer hollow globule of carbon, wherein said globule contains at least one of a carbon nanotube formed therein, metallic constituent, and free water.
Electromagnetic wave absorption material comprising a schungite carbon.
Electromagnetic wave absorption material comprising a schungite carbon, wherein said schungite carbon contains at least one of a carbon nanotube formed therein, metallic constituent, and free water.
Electromagnetic wave absorption material comprising a schungite ore.
Electromagnetic wave absorption material comprising a particulate of electromagnetic wave absorbing matter and a substance that has an electrical resistivity higher than that of said particulate of electromagnetic wave absorbing matter, wherein said electromagnetic wave absorption material has the radio wave return loss of not less than −3.5 dB per 1 GHz of frequency.
Electromagnetic wave absorption material comprising a particulate of electromagnetic wave absorbing matter and a substance that has an electrical resistivity higher than that of said particulate of electromagnetic wave absorbing matter, wherein said electromagnetic wave absorption material has the radio wave return loss of not less than −20 dB at a frequency of 6 GHz.
Dependencies are inferred from the claim text.