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4. 发明专利

JP4812119B2 Radio Wave Shutter 有权
公开(公告)号：JP4812119B2
公开(公告)日：2011-11-09
申请号：JP2007118861
申请日：2007-04-27
申请人：独立行政法人情報通信研究機構
发明人：修三加藤 , 博司原田 , 恭一飯草
IPC分类号： H01Q15/14 , E06B9/02 , H01P1/15 , H05K9/00
摘要： PROBLEM TO BE SOLVED: To provide a radio wave shutter capable of controlling intrusion of radio waves of a frequency or a frequency band to the interior of a room equipped with an anechoic chamber facility. SOLUTION: The radio wave shutter adopts a plurality of basic units, each of which comprises a variable reactor sandwiched between two conductors of a dipole antenna for resonating with target radio waves and connected in series. The plurality of basic units are connected and arranged by resistors of bigger impedance than reactance of the variable reactor. When each variable reactor is impressed with a first electric condition and a second electric condition through the resistor, each variable reactor has a first impedance and a second impedance smaller than the first impedance in relation to the target radio waves. Thereby, when each variable reactor is impressed with the first electric condition and the second electric condition, each variable reactor shows a first transmission factor and a second transmission factor smaller than the first transmission factor in relation to the target radio waves. COPYRIGHT: (C)2009,JPO&INPIT

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