| 摘要 |
PROBLEM TO BE SOLVED: To obtain a filter switching circuit in which a bandpass filter having a higher passing frequency band can be selected using a smaller number of relays and can be connected between two amplifiers through a distance as short as possible. SOLUTION: A first relay 5-0 is arranged in the vicinity of an output end 2a or an input end 3a and the switching terminal (a) thereof is connected with the output end 2a or the input end 3a. Remaining relays are made to correspond with respective filters 4 and arranged on the opposite sides of a line sequentially in adjacent to the first relay 5-0. Subsequently, the switching terminals (a) of relays arranged on the same side are connected sequentially with one fixed terminal (b) and cascaded, respectively, with two fixed terminals (b) and (c) of the first relay 5-0. The other terminal (c) of the remaining relays are connected, respectively, with one filter and the passing frequency band of filters being connected closer to the first relay 5-0 is made higher sequentially.
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