Saw device with apodized IDT

Details Saw device with apodized IDT Saw device with apodized IDT

1987-09-23

1991-05-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333154, H01L 4108

Patent

active

050197428

ABSTRACT:
A SAW (surface acoustic wave) device includes a substrate having thereon at least one apodized IDT (inter-digital transducer). The axis of the apodization pattern is inclined towards a driven conductive rail of the IDT at the ends of the pattern, whereby the driven end fingers have a low capacitive coupling to a ground plane on which the substrate is supported. The capacitive coupling to the ground plane may also be reduced by supporting the substrate on the ground plane via an insulating support, whereby an air gap or the insulating support decreases the capacitance between the IDT and the ground plane.

REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 3663899 (1972-05-01), Dieulesaint et al.
patent: 3688223 (1972-08-01), Pratt et al.
patent: 3699364 (1972-10-01), Gerard
patent: 4007433 (1977-02-01), Houkawa et al.
patent: 4066985 (1978-01-01), Kuny
patent: 4096456 (1978-06-01), Coussot et al.
patent: 4354129 (1982-10-01), Ieki

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