Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-12-23
1999-04-20
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333196, 310313D, H03H 964
Patent
active
058960724
ABSTRACT:
A surface acoustic wave filter has one or more acoustic filter tracks. Each track has an input interdigital converter, an output interdigital converter, and a reflector. The reflector reflects surface waves between the input and output inter-digital converter by 180.degree.. The reflector is formed with a multiplicity of reflector electrode fingers which are combined into reflector finger groups. Mutually adjacent reflector finger groups are spaced apart by a defined spacing distance such that respective signals in adjacent reflector finger groups are superimposed in antiphase.
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P.D. White et al.; "Synthesis and Design of Weighted Reflector Banks for SAW Resonators", 1978 Ultrasonics Symposium Proceedings, Cherry Hill, NJ, USA (Sep. 25-27, 1978); pp. 634-638.
Bergmann Andreas
Machui Jurgen
Greenberg Laurence A.
Lerner Herbert L.
Pascal Robert
Siemens Matsushita Components GmbH & Co. KG
Summons Barbara
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