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US 4,785,270 AGranted
Monolithic lattice saw filter
AssigneeMotorola, Inc.
InventorRobert G. Kinsman
Life of this patent
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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.
Claims17
A bandpass filter comprising:
- a monolithic piezoelectric substrate;
- and
- first and second dual port SAW devices disposed on said substrate and coupled in a full lattice circuit configuration, the first lead of the input of said filter being coupled to the second inputs of said first and second SAW devices and the second lead of the input of said filter being coupled to the first inputs of said first and second devices, the first output of said first device being coupled to the second output of said second device to form the first lead of the filter output, and the first output of said second device being coupled to the second output of said first device to form the second lead of the filter output.
A bandpass filter comprising:
- a monolithic piezoelectric substrate;
- and a first and second set of elements disposed on said substrate and coupled in a cascaded circuit configuration, each of said set of elements comprised of a first and second dual port SAW device electrically coupled to one another, said first set of elements coupled to the input of said filter and coupled to said second set of elements, said second set of elements being coupled to the output o said filter.
Dependencies are inferred from the claim text.