Edge-reflection surface acoustic wave filter

Details Edge-reflection surface acoustic wave filter Edge-reflection surface acoustic wave filter

2005-03-29

2005-03-29

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S196000, C310S31300R

Reexamination Certificate

active

06873226

ABSTRACT:
An edge reflection surface acoustic wave filter includes IDTs disposed on a top surface of a piezoelectric substrate, and surface acoustic waves of the Shear Horizontal type are reflected between opposite edges. At least one outermost electrode finger in the direction of propagation of surface acoustic waves on the side of at least one of the edges is removed. Accordingly, desired filter characteristics can readily be achieved without causing variations in filter characteristics, spurious components at frequencies lower than the passband are minimized, and selectivity is greatly improved.

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