| 摘要 |
PROBLEM TO BE SOLVED: To provide a band rejection filter(BRF) with a high Q, a small size and ease of frequency adjustment, where a main signal flows through its microstrip line. SOLUTION: An inner (center) conductor 1 of a channel shape, that is preferably subjected to sheet metal working is put into an outer conductor 2 of a sheet metal case shape to configure a pair of resonators, the one side of which is short-circuited with each other via a conductive support spacer 6 and the other side, of which is open with an interval S. Adjustment machine screws 3 are located at places close to the open position of the inner (center) conductor 1 in each resonator for varying the stray capacitance for frequency adjustment. Degree of coupling between the resonators is adjusted by the open position of the interval S of the inner (center) conductor 1. Furthermore, by properly setting the interval between the inner (center) conductor 1 and a MAIN signal line (microstrip line 4), the coupling between the resonators and the microstrip line 4 is made.
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