TE Harmonic Overtone Mode Energy-Trapped Ceramic Filter with Narrow Frequency Tolerance

概要

論文の詳細を見る
Experimental studies have been made on the suppression of two major spurious responses, i.e., inharmonic overtones and the 6th thickness-shear-mode harmonic overtone, to realize a 3rd overtone thickness-extension double-mode bandpass filter using PbTiO_3 ceramic substrates. Each leverage was found by investiging of low-symmetry electrode shapes and implementing the nonpolarized portion of the region between terminal pads on the piezoelectric substrate. The practical importance of the application of intermediate-frequency filters (IF filters) used in wireless communication systems depends on how the narrow frequency tolerance requirement is satisfied. A simple but accurate method of adjusting the center frequency of these filters is shown here.
社団法人応用物理学会の論文
1997-09-30