Saw filter with wave reflections and phase differences

Details Saw filter with wave reflections and phase differences Saw filter with wave reflections and phase differences

1995-04-24

1997-09-02

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 310313B, H03H 964

Patent

active

056636962

ABSTRACT:
A SAW filter comprising a group of N tracks, where N is an odd integer greater than 2, and including an input interdigitated transducer (IDT) spaced apart from an output IDT. The respective tracks are selectable to have different effective electro-acoustic lengths such that surface acoustic waves launched from respective input IDTs undergo at least one reflection at corresponding output IDTs and at least one reflection from the respective input IDTs prior to generating coherent signals from respective output IDTs. The different effective electro-acoustic lengths may be substantially provided by there being different physical separation between input and output IDTs of respective tracks, or by IDTs of respective tracks having different polarity connections of electrodes or different amounts of material deposited in respective tracks between the input and output IDTs.

REFERENCES:
patent: 4028649 (1977-06-01), Komatsu et al.
patent: 4736172 (1988-04-01), Ebneter
Claiborne et al., "Low Loss Saw Filters Using Unidirectional Transducer Technology," Proceedings of 1979 ISCAS, Jul. 1979, pp. 609-612.

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