| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter which reduces radiation loss even in high frequency areas to allow a resonator to have high Q value. SOLUTION: The filter has a resonance unit (105) that has a plurality of cascade-connected resonators (111 to 114), each of which is formed of microstrip lines; and charge coupled devices (122 to 123) and a connection line (131) that are a connection unit in which at least one adjacent pair of resonators of the resonance unit (105) are coupled, in a coupling area that the electric length is within the range of±45°from the maximum voltage point in the middle of the microstrip lines of the resonators (111 to 114). COPYRIGHT: (C)2007,JPO&INPIT
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