| 摘要 |
PROBLEM TO BE SOLVED: To provide a semi-coaxial resonator band-elimination filter that can maintain a miniaturization when QL value is comparatively small. SOLUTION: This filter is a band-elimination filter 1 of which three semi- coaxial resonators 241-243 are combined with an outer conductor 21 at the fixed interval ofλo/4, and of which a phase delay arises by the large capacitance. The inductive posts 10 are interposed into almost the half location between the adjacent resonators. A phase lead for the amount corresponding to the phase delay by the large capacitance is carried out by the posts 10,λo/4 can be ensured electrically, and the necessity of increasing the resonator interval to 3λo/4 can be avoided.
|
