Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-07-11
1982-02-02
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313R, 333151, 333194, H03H 964, H03H 925, H03H 9145, H03H 942
Patent
active
043142150
ABSTRACT:
A surface acoustic wave filter device in which a capacitative coupling means is provided to couple at least one of the terminals of the SAW input transducer to at least one of the terminals of the output transducer, in order to equalize the levels of signals which are induced on the pair of output terminals of said output transducer without assuming the form of surface acoustic waves. The stray inductive coupling which normally occurs between the input and output terminals of the SAW filter degrades filter performance. Since the inductive coupling to the two output terminals is normally unequal, the inductively coupled unfiltered signals cannot be completely rejected by a balanced differential amplifier. By equalizing the levels of unfiltered signals at the output terminal, effective rejection by a differential amplifier is possible.
REFERENCES:
patent: 3878407 (1975-04-01), Hartemann et al.
patent: 4126839 (1978-11-01), Yamanoi et al.
patent: 4237432 (1980-12-01), Huang et al.
patent: 4250473 (1981-02-01), Gemba
Tanji Shigeo
Tominaga Hideki
Wakatsuki Noboru
Fujitsu Limited
Nussbaum Marvin L.
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