BAND-PASS FILTER AND BRANCHING DEVICE COMPRISING DUAL MODE DIELECTRIC RESONATOR

摘要

PURPOSE: To obtain the band-pass filter with an excellent and stable temperature characteristic and the small branching filter by adopting a support disk made of a ceramic for a support of a dual mode dielectric resonance element. ;CONSTITUTION: Support disks 3₁, 3₂ made of an alumina ceramic whose dielectric constant is properly lower than a dielectric constant of resonance elements 2₁, 2₂ are employed for supports the dual mode dielectric resonator elements 2₁, 2₂. As a result, since the ceramics, especially the alumina ceramic being the material of the support disks 3₁, 3₂ has a high mechanical strength, a low linear expansion coefficient and less change in the dielectric constant due to a temperature change, the resonance elements 2₁, 2₂ are supported very stably mechanically and electrically. Moreover, the alumina ceramic has excellent thermal conductivity and heat generated by a power loss of the resonance elements 2₁, 2₂ is delivered to an external conductor and dissipated therefrom via the support disks 3₁, 3₂, then the fluctuation in the resonance frequency caused by deformation of each element due to a temperature rise is very small.;COPYRIGHT: (C)1995,JPO