Electric filter employing acoustic waves

Details Electric filter employing acoustic waves Electric filter employing acoustic waves

1986-05-06

1987-06-09

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333154, 333195, H03H 9145, H03H 964, H03H 942

Patent

active

046723390

ABSTRACT:
A surface wave filter (1, 11, 21, 31, 41) having a shielding structure (13, 23, 33, 43, 53) arranged between the inter-digital, asymmetrically operating structures (2, 3), which encompasses two such sub-structures (14, 24, 34, 44, 44a) and/or (15, 25, 35, 45, 35a), which are individually connected with the finger structures of the adjacent transducer structure (2 and/or 3) that are at reference ground potential.

REFERENCES:
patent: 3573673 (1971-04-01), De Vries et al.
patent: 3872410 (1975-03-01), Zucker
patent: 4516094 (1985-05-01), Lee
Cross et al., "Very Low Loss SAW Resonators Using Parallel Coupled Cavities", 1982, IEEE, pp. 284-289.
Desbois, "The Problem of the Accuracy in the Fabrication of Multipole SAW Resonator Filters", 1979, IEEE, pp. 841-844.
Coldren, "Surface-Acoustic-Wave Resonator Filters", Jan. 1979, IEEE, pp. 147-158.
U.S. Ser. No. 819,304, (VPA 85 P 1026), Bulst et al., assigned to Siemens AG.

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