| 摘要 |
PROBLEM TO BE SOLVED: To form attenuation poles as many as possible at an optional frequency. SOLUTION: This filter is provided with the N pieces (N is an integer >=2) of half wavelength resonators, an input terminal 3, and output terminal 4, a first matching means 5 for matching a first resonator and the input terminal, a second matching means 6 for matching an N-th resonator and the output terminal 4 and the (N-1) pieces of inter-stage connection means 7 for connecting the resonators. Then, the exciting positions of the first and N-th resonators are shifted from the center position of the resonators into one of end face directions and at least one or more inter-stage connection means 7 is electrically connected to a part other than both end parts of the resonators. |
