Patent US3693115A successfully refreshed from Google Patents.
US3693115A
Expired / Lapsed
US
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Mechanical tunable bandpass filter
Assignee: American Electronic Laboratories Inc
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Filing: 1970-12-28
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Granted: 1972-09-19
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Expires: 1990-12-28
Abstract
Abstract A filter including a closed conducting housing having a pair of side walls which are the ground planes of the filter. Input and output rods of fixed length are mounted in spaced relation between the side walls. A plurality of resonator bars are between the side walls and in spaced relation between the input and output rods. The electric and magnetic coupling between each pair of adjacent bars is controlled by fixed septa or partitions having a special shape. The resonator bars are movable and are adapted to be varied in length in unison so as to tune the filter. The various fixed dimensions and especially those of the partitions between adjacent resonators are chosen so as to maintain the width of the transmission passband substantially constant or variable in a desired manner, while the passband frequencies are shifted by tuning.
Inventors
- 👤 William A Edson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:52
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said metal partitions having an opening which increases in size in the direction transverse to the direction of the adjustment of the length of said resonator bars, the coupling between adjacent bars increasing linearly with the adjustment of said resonator bars.
Claim 2
Dependent Claim
146 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said metal partitions having an opening which increases in size in the direction transverse to the direction of the adjustment of the length of said resonator bars, the coupling between adjacent bars increasing linearly with the adjustment of said resonator bars.
Claim 3
Dependent Claim
148 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said metal partitions having an opening which increases in size in the direction transverse to the direction of the adjustment of the length of said resonator bars, the coupling between adjacent bars increasing non-linearly with the adjustment of length of said resonator bars.
Claim 4
Dependent Claim
148 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said metal partitions having an opening which increases in size in the direction transverse to the direction of the adjustment of the length of said resonator bars, the coupling between adjacent bars increasing non-linearly with the adjustment of length of said resonator bars.
Claim 5
Dependent Claim
137 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said partitions including a pair of thin coplanar metal members projecting respectively from said ground planes and being positioned between adjacent bars providing a restricted opening therebetween for partially decoupling said bars.
Claim 6
Dependent Claim
137 words
A filter tunable between upper and lower frequency limits comprising a pair of spaced parallel ground planes, spaced input and output bars positioned between said ground planes, resonator bars positioned between said ground planes and arranged in spaced parallel relation between said input and output bars, means for adjusting said resonator bars to tune the filter over a wide range of frequencies, said tuning means including means for adjusting the length of said resonator bars, and a plurality of metal partitions between and partially decoupling respective adjacent bars, said metal partitions being thin metal members providing a restricted opening between a pair of adjacent bars, said partitions including a pair of thin coplanar metal members projecting respectively from said ground planes and being positioned between adjacent bars providing a restricted opening therebetween for partially decoupling said bars.
Claim 7
Dependent Claim
32 words
The filter of claim 3 in which the opening between the coplanar members varies in size in the direction transverse to the direction of adjustment of the length of said resonator bars.
Claim 8
Dependent Claim
42 words
The filter of claim 4 in which the opening between the coplanar members has at least a portion of its boundary which provides a constant size in the direction transverse to the direction of adjustment of the length of said resonator bars.
Claim 9
Dependent Claim
36 words
The filter of claim 4 in which the opening between the coplanar members has at least a portion of its boundary which is perpendicular to the direction of adjustment of the length of said resonator bars.
Claim 10
Dependent Claim
12 words
The filter of claim 5 in which the members have rectangular configurations.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |