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US4477785A
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Generalized dielectric resonator filter
Assignee: Comsat Corp
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Filing: 1981-12-02
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Granted: 1984-10-16
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Expires: 2001-12-02
Abstract
Abstract A generalized dielectric resonator filter is disclosed for the realization of the most general transfer function characteristics of band-pass filters using cylindrical dielectric resonator discs in a microstrip transmission line configuration. The dielectric resonator filter of the invention has electrical properties comparable to conventional waveguide filters, but has a much smaller volume and mass, and is thus very attractive for use in the construction of input multiplexers of communications satellite transponders.
Inventors
- 👤 Ali E. Atia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:43
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208; H01P1/2084
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A generalized canonical form filter for electromagnetic waves, comprising an input, an output and a plurality of dielectric resonators disposed between said input and said output, said resonators being serially coupled by series couplings of the same sign, physically adjacent but electrically non-adjacent resonators being coupled by shunt couplings of arbitrary sign, wherein said couplings comprise microstrip lines extending between said resonators, said lines terminating in arcuate portion having a radius originating at the centers of said resonators.
Claim 2
Dependent Claim
78 words
A generalized canonical form filter for electromagnetic waves, comprising an input, an output and a plurality of dielectric resonators disposed between said input and said output, said resonators being serially coupled by series couplings of the same sign, physically adjacent but electrically non-adjacent resonators being coupled by shunt couplings of arbitrary sign, wherein said couplings comprise microstrip lines extending between said resonators, said lines terminating in arcuate portion having a radius originating at the centers of said resonators.
Claim 3
Dependent Claim
39 words
A filter as claimed in claim 1, wherein said electrically non-adjacent resonators are separated by a central wall, and are coupled by means of λ/4 or 3λ/4 length microstrip lines running between said resonators and beneath said central wall.
Claim 4
Dependent Claim
48 words
A filter as claimed in claim 1 or 2, wherein said resonators are disposed in two adjacent rows, and within each row said series couplings comprise microstrip lines disposed on a substrate, said resonators being separated by partial walls and said series couplings running beneath said partial walls.
Claim 5
Dependent Claim
29 words
A filter as claimed in claim 1 or 2, wherein said resonators are disposed in two adjacent rows, and within each row said series couplings comprising directly coupled resonators.
Claim 6
Dependent Claim
32 words
A filter as claimed in claim 1, wherein said resonators are disposed above said microstrip coupling lines by a distance, the value of said couplings being adjustable primarily by varying said distance.
Claim 7
Dependent Claim
14 words
A filter as claimed in claim 5, said resonators being supported by dielectric spacers.
Claim 8
Dependent Claim
15 words
A filter as claimed in claim 5, said resonators being supported by foam support members.
Claim 9
Dependent Claim
52 words
A filter as claimed in claim 1, said filter being disposed within a housing having a central wall separating adjacent rows of resonators, at least said shunt couplings comprising microstrip lines between resonators, said microstrip lines being disposed on a substrate covered by said housing, said resonators being spaced from said substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |