| 摘要 |
A BPF 20 , which is a filter circuit, is formed by arranging a plurality of wiring patterns 21 a, 21 b and 22 a to 22 c on a substrate 10 . Also, a freely movable impedance control rod 26 is formed so as to interfere with characteristics of the wiring patterns 21 a, 21 b and 22 a to 22 c of the BPF 20 without touching them. Interfering with the characteristics means cutting the passage of the frequency at the BPF 20 , so that switching depends on whether the frequency is passed or cut.
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