| 摘要 |
PURPOSE:To adjust the trap frequency by arranging a conductor chip closely between coupling microstrip lines connected to the input and output and nearly deciding the trap frequency of a narrow band BPF so as to adjust the degree of coupling. CONSTITUTION:A signal inputted from a high frequency signal input line 5 is resonated by an input line 5 and a both-end open line 7, the signal is delivered to a both-end open line 8 by the coupling between the both-end open lines 7 and 8, the signal is resonated at the output side also by the output line 6 and the both-end open line 8, the signal is outputted from the output line 6. Thus, a BPF is constituted in this way. The input line 5 and the output line 6 are coupled with a physical distance to form a trap at the higher and lower frequencies of the signal pass band. The conductor chip 4 whose one end is grounded is placed between the input line 5 and the output line 6 and the electrostatic coupling degree on a dielectric base 1 between the input line 5 and the output line 6 is changed by varying the distance between the conductor chip 4 and the line arranging face of the dielectric base 1.
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