US3875538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave bandpass filter
Assignee: Individual
•
Filing: 1974-02-20
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Granted: 1975-04-01
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Expires: 1994-02-20
Abstract
Abstract Microwave filter of strip transmission line structure. It comprises a main rectilinear strip conductor and a plurality of open-ended strip line stubs all having one half wave length at the mid frequency of the filter and parallel-connected to the main strip conductor. The connecting points are regularly spaced apart along the main strip conductor and, on each strip line stub, they are selectively offset with respect to the midpoint of the stub.
Inventors
- 👤 Roger P Minet
- 👤 Jean H Debeau
- 👤 Ernest L Thepault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/2039; H01P7/00; H01P7/08; H01P7/084; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/866
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A microwave bandpass filter of strip transmission line structure comprising a main rectilinear strip conductor, a plurality of open-ended strip line stubs all having one-half wave length at the mid frequency of the passband of said filter and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and being, on each strip line stub, selectively offset with respect to the midpoint of the stub, and their spacing along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 2
Dependent Claim
98 words
A microwave bandpass filter of strip transmission line structure comprising a main rectilinear strip conductor, a plurality of open-ended strip line stubs all having one-half wave length at the mid frequency of the passband of said filter and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and being, on each strip line stub, selectively offset with respect to the midpoint of the stub, and their spacing along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 3
Dependent Claim
138 words
A microwave bandpass filter of strip transmission line structure comprising a main rectilinear strip conductor having a given width, a plurality of open-ended strip line stubs all having one-half wave length at the mid frequency of the passband of said filter and formed by a stub strip conductor having the same width as the main strip conductor and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and, on each strip line stub, selectively offset with respect to the midpoint of the stub, the distance between the connecting point and the midpoint of a stub being different for each stub, and the spacing of said connecting points along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 4
Dependent Claim
138 words
A microwave bandpass filter of strip transmission line structure comprising a main rectilinear strip conductor having a given width, a plurality of open-ended strip line stubs all having one-half wave length at the mid frequency of the passband of said filter and formed by a stub strip conductor having the same width as the main strip conductor and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and, on each strip line stub, selectively offset with respect to the midpoint of the stub, the distance between the connecting point and the midpoint of a stub being different for each stub, and the spacing of said connecting points along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 5
Dependent Claim
134 words
A microwave bandpass filter of the strip transmission line structure comprising a main rectilinear strip conductor having a given width, a plurality of open-ended striP line stubs all having one-half wave length at the mid frequency of the passband of said filter and formed by stub strip conductors having different widths and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and, on each strip line stub, selectively offset with respect to the midpoint of the stub, the distance between the connecting point and the midpoint of a stub being the same for all the stubs, and the spacing of said connecting points along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 6
Dependent Claim
134 words
A microwave bandpass filter of the strip transmission line structure comprising a main rectilinear strip conductor having a given width, a plurality of open-ended striP line stubs all having one-half wave length at the mid frequency of the passband of said filter and formed by stub strip conductors having different widths and parallel-connected to the main strip conductor at connecting points, said connecting points being regularly spaced apart along the main strip conductor and, on each strip line stub, selectively offset with respect to the midpoint of the stub, the distance between the connecting point and the midpoint of a stub being the same for all the stubs, and the spacing of said connecting points along said main conductor being much smaller than a quarter wavelength along said main conductor at said mid frequency.
Claim 7
Dependent Claim
23 words
A filter as claimed in claim 1, in which said spacing is substantially equal to one-eighth of a wavelength along said main conductor.
Claim 8
Dependent Claim
23 words
A filter as claimed in claim 2, in which said spacing is substantially equal to one-eighth of a wavelength along said main conductor.
Claim 9
Dependent Claim
23 words
A filter as claimed in claim 3, in which said spacing is substantially equal to one-eighth of a wavelength along said main conductor.
References Cited (Backward Citations)
US2532993A
Cited
US3345589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |