Patent US3686592A successfully refreshed from Google Patents.
US3686592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic coupled crystal resonator filter having cross impedance adjusting means
Assignee: United States Department of the Army
•
Filing: 1970-10-08
•
Granted: 1972-08-22
•
Expires: 1990-10-08
Abstract
Abstract A monolithic coupled resonator bandpass filter having pairs of input and output electrodes mounted on a crystal resonator such as quartz. A generator is coupled to the high potential side of the input electrodes via an adjustable input impedance. The high potential side of the output electrodes is coupled to a load via an adjustable output impedance. The low potential sides of the input and output electrodes are coupled to ground via adjustable base impedances. The frequency transfer response of the filter may be adjusted by proper adjustment of the various adjustable impedances. Proper adjustment of the base impedances can adjust the symmetry and ripple of the transfer response curve.
Inventors
- 👤 Frank K Priebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:37
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/566
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
A monolithic bandpass filter comprising a crystal resonator characterized by a lattice equivalent network, said network having effective cross impedance; a first pair of electrodes mounted on said crystal resonator; a second pair of electrodes moUnted on said crystal resonator; a signal input means having one side thereof connected via an input impedance means to one of said first pair of electrodes; a signal output means having one side thereof connected via an output impedance means to one of said second pair of electrodes; the other sides of said signal input and output means connected in common; and a cross impedance adjusting means connected between the other electrodes of said pairs of electrodes and said common connection for adjusting with respect to each other the relative values of the effective cross impedances between said first and second pairs of electrodes.
Claim 2
Dependent Claim
140 words
A monolithic bandpass filter comprising a crystal resonator characterized by a lattice equivalent network, said network having effective cross impedance; a first pair of electrodes mounted on said crystal resonator; a second pair of electrodes moUnted on said crystal resonator; a signal input means having one side thereof connected via an input impedance means to one of said first pair of electrodes; a signal output means having one side thereof connected via an output impedance means to one of said second pair of electrodes; the other sides of said signal input and output means connected in common; and a cross impedance adjusting means connected between the other electrodes of said pairs of electrodes and said common connection for adjusting with respect to each other the relative values of the effective cross impedances between said first and second pairs of electrodes.
Claim 3
Dependent Claim
28 words
The device according to claim 1 and wherein said cross impedance adjusting means includes an impedance device connected between one of said other electrodes and said common connection.
Claim 4
Dependent Claim
27 words
The device according to claim 1 and wherein said cross impedance adjusting means includes impedance devices connected between each of said other electrodes and said common connection.
Claim 5
Dependent Claim
20 words
The device according to claim 3 and wherein each said impedance device of said cross impedance adjusting means is adjustable.
References Cited (Backward Citations)
US2248776A
Cited
US2271870A
Cited
US3222622A
Cited
US3437848A
Cited
US3564463A
Cited
US3564463B1
Cited
US3518573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |