Longitudinally coupled double mode surface wave resonators

Details Longitudinally coupled double mode surface wave resonators Longitudinally coupled double mode surface wave resonators

1996-06-06

1998-11-10

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, H03H 972, H01L 4108

Patent

active

058359907

ABSTRACT:
A longitudinally coupled double mode surface wave resonator comprises two reflectors, two lateral IDTs (inter-digital transducers), and a centre IDT arranged on a surface of a piezoelectric substrate, for coupling surface waves longitudinally between the IDTs. The two lateral IDTs operate with opposite signal phases by virtue of opposite connections, opposite polarities, or oppositely phased spacings from the centre IDT. Alternatively, or in addition, the centre IDT is divided into two oppositely phased halves. A filter comprising one or more resonators can replace both a filter and a balun in a radio frequency circuit.

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"Wideband Low Loss Double Mode SAW Filters", T. Morita et al, Proceedings of the IEEE Ultrasonics Symposium, 1992, pp. 95-104.

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