Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1987-12-30
1988-11-15
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333190, 333191, 310313R, H03H 956, H03H 960, H03H 964
Patent
active
047852704
ABSTRACT:
A monolithic lattice SAW bandpass filter having low insertion loss and a wide bandwidth range is described herein. Specifically, the bandpass filter includes a monolithic piezoelectric substrate and two dual port SAW device disposed on the substrate and coupled in a full lattice circuit configuration. In a second bandpass filter design the filter includes a monolithic substrate and two sets of dual port SAW devices disposed on the substrate and coupled in a cascaded circuit configuration such that no electrical crossovers occurs on the substrate.
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patent: 4468642 (1984-08-01), Hikata
patent: 4492940 (1985-01-01), Hikata
V. M. Ristic and M. Yamauchi, "High Q SAW Filter for VHF Band," Proc. 1975 IEEE Ultrasonics Symposium, 315-316, (1975).
W. P. Mason, "Electromechanical Transducer and Wave Filters," 2nd Ed., Van Nostrand, New York, pp. 248-263, (1948).
F. Ishihara et al., "Narrow Band Filters Using SAW Resonators," Prod. 1975 IEEE Ultrasonics Symposium, 381-384, (1975).
M. Hikata et al., "Miniature SAW Antenna Duplexer for Portable Telephone," 1987 IEEE MTT-S Int'l Microwave Digest, 797-800, (Jun. 1987).
W. J. Tanski, "Multipole SAW Resonator Filters," Proc. 36th Annual Frequency Control Symposium, 400-404, (Jun. 14, 1982).
Jimenez Jose W.
Motorola Inc.
Nussbaum Marvin L.
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