Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-12-22
1982-05-25
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
331107A, 333195, H03H 9145, H03H 925
Patent
active
043319432
ABSTRACT:
The interfering resonances of transverse modes are moade to occur far from the fundamental resonant frequency in a surface acoustic wave (SAW) resonator by connecting a plurality of SAW sub-devices in parallel. The frequency response of this parallel combination is essentially undistorted. Interfering spurious resonances caused by the transverse modes become inconsequential. These devices have a substantially higher power handling capability as compared to conventional resonators with comparable Q. This capability reduces the phase noise of oscillators stabilized by these resonators.
REFERENCES:
patent: 3886504 (1975-05-01), Hartmann et al.
patent: 4060777 (1977-11-01), Tiersten et al.
patent: 4144507 (1979-03-01), Shreve
patent: 4178571 (1979-12-01), Mitchell
patent: 4281301 (1981-07-01), Stevens et al.
patent: 4301428 (1981-11-01), Mayer
Tanski, William J., "GHz SAW Resonators", 1979 Ultrasonics Symposium, Sep., 1979, pp. 815-823.
Hohkawa, Kohji and Shokichiro Yoshikawa, "Temperature Stable Oscillators Employing Parallel Connected SAW Resonators", 1979 Ultrasonics Symposium, Sep. 1979, pp. 623-626.
Cross Peter S.
Shreve William R.
Hewlett--Packard Company
Nussbaum Marvin L.
Wong Edward Y.
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