| 摘要 |
PURPOSE:To attain miniaturization of a radio equipment by coupling coupling holes of adjacent dielectric resonators by a coupling metallic piece and inserting an input/output matching pin respectively to holes of 1st stage and final stage dielectric resonators. CONSTITUTION:A resonance center conductor hole 10 and two non-metallized coupling holes 2 are provided on a resonator open face to constitute a coaxial dielectric resonator 1. Three resonators 1 are arranged in the three-stage while the grounding side face is brought into contact together and coupling holes 2 of the 1st stage and final stage dielectric resonators 1 are coupled by a coupling metallic piece 4 and an input/output matching pin 3 is inserted respectively to other coupling hole of the 1st stage and final dielectric resonators 1. In developing the filter based on various kinds of characteristic specifications, at first, the frequency of the resonator itself is calculated based on the requirement specification and the resonator open face is matched with the frequency by polishment. Then the dimension of the input/output matching pin 3 inserted to the coupling hole 2 and the coupling metallic piece 4 is decided to match the coupling quantity. |
