Surface acoustic wave resonators utilizing harmonic frequencies

Details Surface acoustic wave resonators utilizing harmonic frequencies Surface acoustic wave resonators utilizing harmonic frequencies

1979-02-23

1981-02-03

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

331107A, 333196, H03H 925, H03H 964, H03H 9145, H04R 1710

Patent

active

042491460

ABSTRACT:
A surface acoustic resonator including an interdigital transducer configured to generate acoustic waves at at least one harmonic frequency, and a pair of reflection gratings capable of essentially total reflection of the acoustic waves in both fundamental and harmonic modes of operation. One-port and two-port resonators are disclosed, capable of operation at fundamental and harmonic frequencies, to provide a higher frequency of operation without correspondingly higher resolution requirements for manufacturing processes. For single-mode operation at higher frequencies, the interdigital transducer and reflection gratings have different fundamental frequencies, and utilize harmonics of different order but the same actual frequency, such that the resonator functions at a single frequency, which may be, for example, the third harmonic with respect to the transducer fundamental frequency, and the second harmonic with respect to the reflection grating-fundamental frequency.

REFERENCES:
patent: 3936774 (1976-02-01), Mellon et al.
patent: 3961293 (1976-06-01), Hartmann et al.
patent: 3987376 (1976-10-01), Kerbel
Joseph et al.-"Surface Acoustic Wave Planar Resonator Using Grating Reflectors" in Applied Physics Letters, vol. 26, No. 2, Jan. 15, 1975; pp. 29-31.

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