| 摘要 |
PURPOSE:To reduce the length of a resonator without deteriorating its Q and to improve the capacity efficiency by using a rectangularly-sectioned external conductor wherein an internal conductor is stored fixedly. CONSTITUTION:The stepwise internal conductor 2 having small sectional area on a short-circuit end side and large sectional are a on an open end side is stored in the rectangularly-sectioned external conductor 1. Consequently, the capacity efficiency is improved and flat plate capacitance Cp between the open end surface of the internal conductor 2 and the internal wall surface of the external conductor 1 facing it and capacitance Cfa between terminal edges are both used in combination to obtain a resonator with excellent Q even when internal conductor resonator length lT is shortened. Further, a dielectric 3 with a >1 specific dielectric constant is loaded in the gap of the large-area internal conductor line l2 of a resonator with an increased terminal gap (d) to decrease the characteristic impedance of the line l2, and consequently while the resonator length lT is shortened, the size of the internal conductor is reduced. Further, a screw 4 is provided in the wall surface of the external conductor 1 facing the internal conductor opening end to make a fine adjustment of frequency. |
