US4785270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic lattice saw filter
Assignee: CTS Corp
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Filing: 1987-12-30
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Granted: 1988-11-15
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Expires: 2007-12-30
Abstract
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.
Inventors
- 👤 Robert G. Kinsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:50
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6423; H03H9/6426
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
125 words
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.
Claim 2
Dependent Claim
125 words
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.
Claim 3
Dependent Claim
18 words
The bandpass filter according to claim 1 wherein said dual port SAW devices comprise dual port SAW transducers.
Claim 4
Dependent Claim
18 words
The bandpass filter according to claim 1 wherein said dual port SAW devices comprise dual port SAW resonators.
Claim 5
Dependent Claim
23 words
The bandpass filter according to claim 1 wherein said first dual port SAW device comprises two dual port SAW transducers coupled in parallel.
Claim 6
Dependent Claim
39 words
The bandpass filter according to claim 1 wherein said first SAW device comprises a plurality of dual port SAW transducers coupled in parallel and said second SAW device comprises a plurality of dual port SAW transducers coupled in parallel.
Claim 7
Dependent Claim
19 words
The bandpass filter according to claim 2 wherein said second dual port SAW device is comprised of two capacitors.
Claim 8
Dependent Claim
22 words
The bandpass filter according to claim 1 wherein the input and output of said filter are coupled to external push pull circuits.
Claim 9
Dependent Claim
24 words
The bandpass filter according to claim 4 wherein said filter is a four pole filter that has the frequencies shifted to minimize passband ripple.
Claim 10
Dependent Claim
81 words
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.
Claim 11
Dependent Claim
81 words
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.
Claim 12
Dependent Claim
62 words
The bandpass filter according to claim 9 wherein the outputs of said first and second SAW devices of each said first and second set of elements are coupled to one another, and wherein said first and second set of elements are electrically coupled by coupling one input of each of said second SAW devices and coupling the outputs of said SAW devices.
Claim 13
Dependent Claim
32 words
The bandpass filter according to claim 10 wherein said filter may include a plurality of sets of dual port SAW devices disposed on said substrate and coupled in a cascaded circuit configuration.
Claim 14
Dependent Claim
18 words
The bandpass filter according to claim 10 wherein said dual port SAW devices comprise dual port SAW transducers.
Claim 15
Dependent Claim
18 words
The bandpass filter according to claim 10 wherein said dual port SAW devices comprise dual port SAW resonators.
Claim 16
Dependent Claim
23 words
The bandpass filter according to claim 10 wherein said first dual port SAW device comprises two dual port SAW transducers coupled in parallel.
Claim 17
Dependent Claim
39 words
The bandpass filter according to claim 10 wherein said first SAW device comprises a plurality of dual port SAW transducers coupled in parallel and said second SAW device comprises a plurality of dual port SAW transducers coupled in parallel.
Claim 18
Dependent Claim
22 words
The bandpass filter according to claim 10 wherein a capacitive element is included between said cascaded first and second sets of elements.
Claim 19
Dependent Claim
31 words
The bandpass filter according to claim 14 wherein said filter is a four pole filter that has the frequencies shifted in said two sets of elements to minimize passband ripple. .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |