| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter circuit where loss is reduced in a passband and an attenuation amount is enlarged in a block band. SOLUTION: The filter circuit 1 comprises a circulator 11 for transmitting a high frequency signal from a first port 111 to a second port 112, and from the second port 112 to a third port 113; a block waveguide 12 whose one opening 121 is connected to the second port 112 of the circulator 11; and a non-reflecting terminal end 13 to be connected to the other opening 122 of the block waveguide 12. COPYRIGHT: (C)2007,JPO&INPIT
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