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Application filed by Tdk CorpfiledCriticalTdk Corp
Priority claimed from PCT/JP1993/000922external-prioritypatent/WO1994001931A1/en
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Publication of TW225059BpublicationCriticalpatent/TW225059B/en
In this invention, a plurality of piezo electric ceramic filters having different central frequency are connected cascaded. The absolute value of frequency difference dFo of the central frequency of the piezo electric ceramic filters is denoted by 3 dFo 3, when the insertion loss is less than 3dB, the pass band width is BW3, at this condition the relation of o<徭FoBW3 < 0.8 can be satisfied. By this way, the insertion loss can be decreased and the group delay character can be improved.
TW082105138A1993-07-051993-06-28Piezo-electric ceramic filter circuit and piezo-electric ceramic filter
TW225059B
(en)