| 摘要 |
PURPOSE:To easily obtain electric performance that a filter requires without any complicate devising by mounting dielectrics on a resonance conductor. CONSTITUTION:Numbers of dielectrics 19 which differ in size are used, and the resonance frequency of this resonance conductor 17 is adjusted by a tuning element 18 facing the conductor 17. Then, dielectrics 19 are mounted on the resonance conductors 17 while sizes and mounting positions are changed, and the difference in dielectric constant between the presence and absence of the dielectrics 19 is utilized to adjust the mutual capacity between the resonance conductor 17 and an input/output element 16, or between resonance conductors 17. Consequently, an error in mutual capacity due to a size error in machining is corrected, and consequently necessary electric performance is obtained. |
