| 摘要 |
PROBLEM TO BE SOLVED: To provide an interdigital band-pass filter that can adjust simply coupling between each resonance elements. SOLUTION: In the interdigital band-pass filter which has an outer conductor 2 and a plurality of resonant elements 1 provided wherein, this filter has conductive coupling regulating rods 10 having the same length as a plurality of resonant elements 1 in the axial length direction between the adjacent resonant elements 1. These coupling adjusting rods 10 can adjust the distance between them and the side wall in parallel with the axis of the plural resonance elements 1 and in the direction connecting the plural resonance elements 1, while both ends are provided between the adjacent resonance elements 1 which are fixed to the external conductor 2. The long holes are formed on the upper surface and the under surface of the external conductor 2 and the coupling regulating rods 10 are fixed to the external conductor 2 at an arbitrary position in these holes.
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