Shallow bulk acoustic wave devices employing energy trapping

Details Shallow bulk acoustic wave devices employing energy trapping Shallow bulk acoustic wave devices employing energy trapping

1979-06-04

1981-09-15

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic bulk wave propagation means

333147, 333153, 333194, 333195, H03H 954, H03H 964, H03H 930

Patent

active

042900336

ABSTRACT:
Energy trapping elements for use with shallow bulk acoustic wave devices of various kinds, to minimize the insertion loses in such devices due to spreading of electroacoustic energy into the crystal substrate upon which the devices are constructed. Electroacoustic energy propagated in a substrate is trapped close to the surface of the substrate by means of trapping elements comprising a plurality of strips or grooves disposed on the surface of the substrate in the path of the propagated energy, and oriented approximately perpendicularly to the direction of propagation. The spacing of the elements is such that their stop-band frequency, at which energy will be reflected, is substantially different from the characteristic center frequency of the entire device, in order that the elements will serve a purely trapping function and not a reflecting function.

REFERENCES:
patent: 3736587 (1973-05-01), Bush et al.
patent: 3950713 (1976-04-01), Lewis
patent: 4159435 (1979-06-01), Lewis
patent: 4204178 (1980-05-01), Mitchell
Browning et al.-"New Family of Bulk-Acoustic-Wave Devices Employing Interdigital Transducers" in Electronic Letters, Mar. 3, 1977, pp. 128-130.
Lewis-"Surface Skimming Bulk Waves", 1977 Ultrasonics Symposium Proceedings, IEEE Cat. #77CH1264-1SU; pp. 744-752.
Browning et al.-"Bandpass Filters Employing Surface Skimming Bulk Waves", 1977 Ultrasonics Symposium Proceedings, IEEE Cat. #77CH1264-1SU; pp. 753-756.

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