US3879690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributed transmission line filter
Assignee: RCA Corp
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Filing: 1974-05-06
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Granted: 1975-04-22
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Expires: 1994-05-06
Abstract
Abstract An undesired resonance is prevented in a distributed transmission line filter comprising a center conductor having serially connected inductive and capacitive sections separated from a ground conductor by a dielectric substrate having a first thickness for filter inductive sections and a second thickness for at least one of filter capacitive sections.
Inventors
- 👤 Benjamin Golant
- 👤 Norman Richard Landry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/2039
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
Filter apparatus having a plurality of inductive and capacitive sections arranged to provide predetermined frequency pass-bands and stop-bands in response to an input signal, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections for providing said frequency pass-bands and stop-bands in response to said input signal; means for providing a first spacing between said center conductor inductive sections and said ground conductor; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent said one center conductor capacitive section being resonant in said frequency stopband.
Claim 2
Dependent Claim
138 words
Filter apparatus having a plurality of inductive and capacitive sections arranged to provide predetermined frequency pass-bands and stop-bands in response to an input signal, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections for providing said frequency pass-bands and stop-bands in response to said input signal; means for providing a first spacing between said center conductor inductive sections and said ground conductor; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent said one center conductor capacitive section being resonant in said frequency stopband.
Claim 3
Dependent Claim
138 words
Filter apparatus having a plurality of inductive and capacitive sections arranged to provide predetermined frequency pass-bands and stop-bands in response to an input signal, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections for providing said frequency pass-bands and stop-bands in response to said input signal; means for providing a first spacing between said center conductor inductive sections and said ground conductor; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent said one center conductor capacitive section being resonant in said frequency stopband.
Claim 4
Dependent Claim
138 words
Filter apparatus having a plurality of inductive and capacitive sections arranged to provide predetermined frequency pass-bands and stop-bands in response to an input signal, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections for providing said frequency pass-bands and stop-bands in response to said input signal; means for providing a first spacing between said center conductor inductive sections and said ground conductor; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent said one center conductor capacitive section being resonant in said frequency stopband.
Claim 5
Dependent Claim
16 words
Filter apparatus according to claim 1, wherein said plurality of inductive sections have substantially equal dimensions.
Claim 6
Dependent Claim
15 words
Filter apparatus according to claim 1, wherein said electromagnetic transmission line is microstrip transmission line.
Claim 7
Dependent Claim
20 words
Filter apparatus according to claim 1, wherein said serially connected center conductor sections are arranged to approximate a low-pass filter.
Claim 8
Dependent Claim
129 words
Apparatus having input terminals and output terminals and a predetermined arrangement of inductive and capacitive sections, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a planar center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections; means for providing a first spacing between said center conductor inductive sections and said ground conductor, said inductive sections having substantially equal dimensions and being resonant at frequency f1; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent an undesired resonance of said one center conductor capacitive section.
Claim 9
Dependent Claim
129 words
Apparatus having input terminals and output terminals and a predetermined arrangement of inductive and capacitive sections, comprising: an electromagnetic transmission line having a ground conductor on one surface of a dielectric substrate and a planar center conductor on a dielectric substrate surface opposite said one surface, said center conductor having a plurality of serially connected sections dimensioned to approximate said arrangement of said inductive and capacitive sections; means for providing a first spacing between said center conductor inductive sections and said ground conductor, said inductive sections having substantially equal dimensions and being resonant at frequency f1; and means for providing a second spacing between at least one of said center conductor capacitive sections and said ground conductor to prevent an undesired resonance of said one center conductor capacitive section.
Claim 10
Dependent Claim
20 words
Apparatus according to claim 5, further including means connected to said output terminal for attenuating signals at said frequency f1.
References Cited (Backward Citations)
US2915716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |