H - Electricity – 01 – L
Patent
H - Electricity
01
L
333/58, 349/59.1
H01L 41/00 (2006.01) H03H 9/02 (2006.01) H03H 9/145 (2006.01) H03H 9/64 (2006.01)
Patent
CA 1303206
ABSTRACT OF THE DISCLOSURE A surface elastic wave filter for processing a sup- plied signal into a signal with nonlinear-phase frequency characteristics has a piezoelectric substrate for propagat- ing a surface elastic wave through a surface layer thereof and spaced input and output electrodes disposed on the sur- face layer for sending and receiving the surface elastic wave. Each of the input and output electrodes has a pair of common electrodes having comb-shaped interdigitating elec- trode fingers extending therebetween. The central electrode fingers of the input and output electrodes have central axes across the direction of propagation of the surface elastic wave. The distance along the direction of propagation between the central axes is varied in the direction substan- tially normal to the direction of propagation. The surface elastic wave filter may include an electric conductor dis- posed on the piezoelectric substrate between the input and output electrodes and having a dimension in the direction of propagation, the dimension being varied in the direction substantially normal to the direction of propagation. A medium for varying the speed of propagation of the surface elastic wave may be positioned in place of the electric conductor.
583268
Nihon Musen Kabushiki Kaisha
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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