| 摘要 |
PURPOSE:To obtain constant band width over a wide frequency band without changing connection positions of an external device, by shifting resonators in position without any variation between connectors, and thus varying intervals of respective resonators. CONSTITUTION:In a metallic housing 1 having a space in a rectangular parallelepiped shape internally, an input coupling rod 2 and an output coupling rod 3 connected electrically to an input and output connector respectively, and rod- shaped resonators 5, 6, and 7 parallel to them are provided. While the input coupling rod 2 and output coupling rod 3 are held at a specified intervals l0 without being shift in position, the resonators 5 and 7 are set in parallel to an upper lid 1a and a lower lid 1b and put closer to the lower lid 1b to increase the interval l1' between the resonator 5 (or 7) and coupling rod 2 (or 3), and the interval l1' between the resonator 5 (or 7) and resonator 6; and the coupling between the coupling rods and resonators, and between the resonators is made coarse to narrow down the band width of a filter. |
