| 摘要 |
PURPOSE:To reduce number of switching elements without decreasing a switchable band characteristic. CONSTITUTION:An input terminal 11 is connected to an output terminal 14 via the series connection of 1st and 2nd HPFs 12,13. Furthermore, the input terminal 11 is connected to one terminal of the 1st switching element SW 1. The other terminal of the 1st switching element SW1 is connected to the output terminal 14. Third and fourth switching elements SW3, SW4 are used to turn on/off the resonance circuit sections of the 1st and 2nd HPFs 12,13. Through the connection above, number of switching elements is reduced without decreasing the band characteristic to be switched.
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