Three electrode type saw longitudinal coupling filter

Details Three electrode type saw longitudinal coupling filter Three electrode type saw longitudinal coupling filter

1994-12-29

1996-01-16

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313A, 310313D, 333193, H03H 964, H01L 4108

Patent

active

054850525

ABSTRACT:
A three electrode type SAW longitudinal coupling filter includes a piezoelectric substrate having an electromechanical coupling factor (K.sup.2) higher than 10% and, three sets in total of input electrodes and output electrodes. Each of the electrodes includes a plurality of a electrode fingers of comb shape and are formed on the piezoelectric substrate. Reflectors are disposed at opposite sides of the input electrodes and output electrodes. The number of pairs of electrode fingers of the input electrodes is differentiated from the number of pairs of electrode fingers of the output electrodes. By the above arrangement, a large pass-band width can be obtained with small ripples and with an increase of the attenuation amount outside the band region.

REFERENCES:
patent: 4247836 (1981-01-01), Redwood et al.
patent: 5179310 (1953-01-01), Satoh et al.
patent: 5212420 (1993-05-01), Hickernell et al.
patent: 5349260 (1994-09-01), Anemogiannis et al.
patent: 5351022 (1994-09-01), Ruile et al.
patent: 5392013 (1995-02-01), Yamamoto et al.
"High Performance Saw Filters with Several New Technologies for Cellular Radio", Hikita et al., IEEE 1984, pp. 82-92.
"900 MHz Range Wideband Double Mode SAW Filters", Morita et al., pp. 7-14 w/2 drawings, May 28, 1992.

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