| 摘要 |
PROBLEM TO BE SOLVED: To provide a coaxial bandpass filter capable of extremely easily controlling electromagnetic field coupling quantity due to a coupling loop and capable of remarkably improving operation efficiency. SOLUTION: The inside of a case 11 is divided into two spaces through an inner wall 12, and center conductor 13a, 13b are arranged on the centers of respective spaces to constitute coaxial resonators 14a, 14b. A coupling window 17 is formed on the inner wall 12 and a coupling loop fitting screw hole 21 is formed on the case 11 located under the coupling window 17. A loop seating 22 on which the coupling loop 18 is previously set is screwed into the screw hole 21. When the loop seating 22 is inserted into the screw hole 21, the coupling loop 18 is inserted into the case 11 and located on the coupling window 17 part. The loop seating 22 can be rotated in the state inserted into the screw hole 21, and the quantity of an electromagnetic field which interlinks the coaxial resonators 14a, 14b with the coupling loop 18 can be changed by the rotation of the loop seating 22 to control electromagnetic filed coupling quantity between the coaxial resonators 14a, 14b. COPYRIGHT: (C)2006,JPO&NCIPI
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