| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a band pass filter capable of suppressing the effect of a reflected wave at an input terminal and an output terminal, providing excellent impedance matching at the input terminal and the output terminal, and an excellent signal transmission efficiency in a pass band. <P>SOLUTION: A communication apparatus is provided with the band pass filter 100 comprising first and second band pass filters 1, 2 whose pass band characteristics are almost the same, which are connected in parallel and at least to either of which phase shifters 3 to 6 for shifting the phase to cancel at least one reflection wave are connected, and the reflection waves produced from the band pass filters 1, 2 are cancelled with each other in an input terminal pair 9 and an output terminal pair 10. <P>COPYRIGHT: (C)2004,JPO</p> |
