US3609601A
Expired / Lapsed
US
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Monolithic filter having "m" derived characteristics
Assignee: Collins Radio Co
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Filing: 1970-01-12
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Granted: 1971-09-28
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Expires: 1990-01-12
Abstract
Abstract A plurality electrode pairs are formed on a monolithic crystal substrate so that the resonator formed by each electrode pair is coupled acoustically to the next successive resonator, with suitable input and output transducer means associated with the first and last resonators. Discrete capacitor means connect the first electrodes of first and second pairs of electrodes to the second electrodes of said first and second pairs of electrodes. A bridging capacitor, having an order of magnitude of said first discrete capacitor means is connected between said two first electrodes. A signal passing through this bridging capacitor is 180* out-of-phase with the signal passing through filter resonators at the upper and lower limits of the filter passband to produce attenuation poles at said upper and lower limits.
Inventors
- 👤 Howard D Phillips
- 👤 Edward M Frymoyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/566; H03H9/542
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
A monolithic crystal filter means having ''''M'''' derived characteristics and comprising: a crystal substrate; a plurality of resonators formed on said crystal substrate with each resonator comprising a pair of electrodes formed on opposite sides of said substrate; and means for supplying the input signal to be filtered across a first pair of said electrodes; output means for detecting the signal generated across a second pair of electrodes; first capacitor means connecting together a first electrode of each of a first pair of said resonators comprised of a third and a fourth pair of electrodes; and at least one other resonator comprising a fifth pair of electrodes being positioned in between said third and fourth pairs of electrodes; second capacitive means connecting a first electrode of said fifth pair of electrodes to a reference potential; third capacitive means connecting together first electrodes of a second pair of said resonators; said second pair of resonators being separated by at least one other resonator; and fourth capacitive means connecting a first electrode of one of said second pair of resonators to a reference potential.
Claim 2
Dependent Claim
182 words
A monolithic crystal filter means having ''''M'''' derived characteristics and comprising: a crystal substrate; a plurality of resonators formed on said crystal substrate with each resonator comprising a pair of electrodes formed on opposite sides of said substrate; and means for supplying the input signal to be filtered across a first pair of said electrodes; output means for detecting the signal generated across a second pair of electrodes; first capacitor means connecting together a first electrode of each of a first pair of said resonators comprised of a third and a fourth pair of electrodes; and at least one other resonator comprising a fifth pair of electrodes being positioned in between said third and fourth pairs of electrodes; second capacitive means connecting a first electrode of said fifth pair of electrodes to a reference potential; third capacitive means connecting together first electrodes of a second pair of said resonators; said second pair of resonators being separated by at least one other resonator; and fourth capacitive means connecting a first electrode of one of said second pair of resonators to a reference potential.
Claim 3
Dependent Claim
30 words
A monolithic crystal filter means in accordance with claim 3 in which: the second electrode of said one of said second pair of resonators is connected to said reference potential.
Claim 4
Dependent Claim
123 words
A monolithic crystal filter means having ''''M'''' derived characteristics and coMprising: input means and output means; crystal substrate means; a plurality of resonators formed on said substrate with each resonator comprising first and second electrodes formed on opposite sides of said substrate; said plurality of resonators positioned between said input means and said output means to provide a path for the signal to be filtered; first capacitor means connected between a first electrode of a first of said resonators and a first electrode of a second of said resonators; and second capacitor means connecting said first electrode of said first resonator to the second electrode of said first resonator; and at least one resonator being positioned in between said first and second resonators.
Claim 5
Dependent Claim
123 words
A monolithic crystal filter means having ''''M'''' derived characteristics and coMprising: input means and output means; crystal substrate means; a plurality of resonators formed on said substrate with each resonator comprising first and second electrodes formed on opposite sides of said substrate; said plurality of resonators positioned between said input means and said output means to provide a path for the signal to be filtered; first capacitor means connected between a first electrode of a first of said resonators and a first electrode of a second of said resonators; and second capacitor means connecting said first electrode of said first resonator to the second electrode of said first resonator; and at least one resonator being positioned in between said first and second resonators.
Claim 6
Dependent Claim
30 words
A monolithic crystal filter means in accordance with claim 3 comprising: third capacitive means connecting said first electrode of said second resonator to the second electrode of said second resonator.
Claim 7
Dependent Claim
60 words
A monolithic crystal filter means in accordance with claim 3 and further comprising: third capacitive means connecting together first electrodes of a second pair of said resonators; said second pair of resonators being separated by at least one other resonator; and fourth capacitive means connecting a first electrode of one of said second pair of resonators to a reference potential.
Claim 8
Dependent Claim
30 words
A monolithic crystal filter means in accordance with claim 5 in which: the second electrode of said one of said second pair of resonators is connected to said reference potential.
Claim 9
Dependent Claim
156 words
A monolithic crystal filter means having ''''M'''' derived characteristics and comprising: input means and output means; crystal substrate means; a plurality of resonators formed on said substrate with each resonator comprising first and second electrodes formed on opposite sides of said substrate; said plurality of resonators positioned on said substrate to form a path between said input means and said output means for the signal to be filtered; first capacitive means connected between first electrodes of a first pair of said resonators; said first pair of resonators being separated by at least one resonator; second capacitive means connecting said first electrodes of said first pair of resonators to a reference potential; third capacitive means connecting together first electrodes of a second pair of said resonators; said second pair of resonators being separated by at least one other resonator; and fourth capacitive means connecting the first electrodes of said second pair of resonators to a reference potential.
Claim 10
Dependent Claim
156 words
A monolithic crystal filter means having ''''M'''' derived characteristics and comprising: input means and output means; crystal substrate means; a plurality of resonators formed on said substrate with each resonator comprising first and second electrodes formed on opposite sides of said substrate; said plurality of resonators positioned on said substrate to form a path between said input means and said output means for the signal to be filtered; first capacitive means connected between first electrodes of a first pair of said resonators; said first pair of resonators being separated by at least one resonator; second capacitive means connecting said first electrodes of said first pair of resonators to a reference potential; third capacitive means connecting together first electrodes of a second pair of said resonators; said second pair of resonators being separated by at least one other resonator; and fourth capacitive means connecting the first electrodes of said second pair of resonators to a reference potential.
Claim 11
Dependent Claim
26 words
A monolithic filter means in accordance with claim 7 in which: the second electrodes of said second pair of resonators are connected to said reference potential.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |