Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1984-12-03
1986-03-18
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333176, 333177, 333193, H03H 707, H03H 709, H03H 964
Patent
active
045771685
ABSTRACT:
An improved notch filter having a single port, surface acoustic wave transducer in parallel with an inductor and forming a first circuit which primarily blocks the signal frequency at all frequencies except the notch frequency at which point the first circuit becomes essentially resistive and at that point is cancelled by a signal from a second circuit in parallel with said first circuit and which is 180.degree. out-of-phase thereby providing a notch filter.
REFERENCES:
patent: 3241092 (1966-03-01), Toyoshima
patent: 4126837 (1978-11-01), Koyamada et al.
patent: 4166258 (1979-08-01), Tseng
patent: 4353046 (1982-10-01), Hartmann
M. F. Lewis et al., Recent Developments in SAW Devices, IEEE Proceedings, vol. 131, Pt. A, No. 4, pp. 186-215, Jun. 1984.
P. V. Wright et al., A Prototype Low-Loss Filter Employing Single-Phase Unidirectional Transducers, Proceedings IEEE Ultrasonics Symposium 1983, pp. 72-76.
M. Lewis, Low Loss SAW Devices Employing Single Stage Fabrication, Proceedings IEEE Ultrasonics Symposium 1983, pp. 104-108.
C. S. Hartmann et al., An Analysis of SAW Interdigital Transducers with Internal Reflections and the Application to the Design of Single-Phase Unidirectional Transducers, Proceedings IEEE Ultrasonics Symposium, 1982, pp. 40-45.
Nussbaum Marvin L.
R. F. Monolithics, Inc.
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