Surface acoustic wave ring filter

Details Surface acoustic wave ring filter Surface acoustic wave ring filter

1977-10-31

1979-05-15

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313, 333186, H03H 926, H03H 930, H03H 904

Patent

active

041550579

ABSTRACT:
A surface acoustic wave low loss filter device having input and output transducers located along opposed sides of a rectangular propagation path with frequency selective reflective gratings at each of the four corners of the rectangle. Two traveling surface waves traverse the device along opposed paths encountering frequency filtering at the gratings. The two waves arrive at the output transducer additively in phase eliminating the bidirectionality loss normally associated with surface acoustic wave devices. At frequencies for which the gratings are reflective there can be nearly lossless transmission from input to output. At all other frequencies, transmission between input and output transducers is negligible. The device has high sidelobe rejection, adjustable passband skirt slopes, and an adjustable bandwidth.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3582838 (1971-06-01), De Vries
patent: 3611203 (1971-10-01), Cooper
patent: 3883831 (1975-05-01), Williamson et al.
patent: 3967221 (1976-06-01), Cooper et al.
patent: 3983517 (1976-09-01), Weglein
patent: 3999147 (1976-12-01), Otto et al.

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