PROBLEM TO BE SOLVED: To improve the durability and reliability more by simplifying the structure of a movable part. ;SOLUTION: Semicoaxial resonators R1 to R4 corresponding to coaxial terminals P1 to P4 are provided in an external conductor 101 and the internal space is equally divided by shield plates 103 to 106 which shield pairs of the coaxial terminals P1 to P4 and semicoaxial resonators R1 to R4 from adjacent pairs. A rotary shield plate 108 which selectively opens and closes windows 107 that the shield plates 103 to 107 have is provided and the respective pairs are shielded electromagnetically from adjacent pairs in a closed state. The simple structure wherein the windows are provided to the shield plates and opened and closed switches the paths of high-frequency signals, so superior durability and reliability can be obtained.;COPYRIGHT: (C)1999,JPO
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