US4034319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupled bar microwave bandpass filter
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1976-05-10
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Granted: 1977-07-05
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Expires: 1996-05-10
Abstract
Abstract A microwave bandpass filter of the coupled bar type providing either an interdigital or combline structure. The filter consists of a plurality of resonator sections having two ground planes and a resonating bar integral with the structure and extending perpendicularly from one of the walls and parallel to the ground planes. The spacer sections match the dimensions of the resonator sections, but may have different widths thereby to control the spacing between adjacent resonator bars. Alternate resonator sections and spacer sections are mechanically interconnected to form a filter of the desired electrical properties.
Inventors
- 👤 David L. Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A microwave bandpass filter of the coupled bar type comprising: (a) a plurality of resonator sections, each consisting of a single unitary metallic structure having four connected walls forming a hollow member of substantially rectangular cross-section providing two ground planes and a resonating bar integral with said structure and extending from one of the walls parallel to the ground planes; (b) a plurality of spacer sections each matching the dimensions of the walls of a member and having a substantially rectangular cross-section; and (c) means for connecting alternate resonator sections and spacer sections for forming a filter of predetermined properties.
Claim 2
Dependent Claim
100 words
A microwave bandpass filter of the coupled bar type comprising: (a) a plurality of resonator sections, each consisting of a single unitary metallic structure having four connected walls forming a hollow member of substantially rectangular cross-section providing two ground planes and a resonating bar integral with said structure and extending from one of the walls parallel to the ground planes; (b) a plurality of spacer sections each matching the dimensions of the walls of a member and having a substantially rectangular cross-section; and (c) means for connecting alternate resonator sections and spacer sections for forming a filter of predetermined properties.
Claim 3
Dependent Claim
25 words
A filter as defined in claim 1 wherein each of said resonator sections and spacer sections is provided with a high conductive metallic surface layer.
Claim 4
Dependent Claim
23 words
A filter as defined in claim 1 wherein the opening of one of said spacer elements is partially obscured to form an iris.
Claim 5
Dependent Claim
30 words
A filter as defined in claim 1 wherein a closure element is provided for said filter, said closure element having means for applying microwave energy thereto or removing it therefrom.
Claim 6
Dependent Claim
34 words
A filter as defined in claim 4 wherein said closure element is provided with a mechanically variable capacitor forming part of said means for applying and extending through a face of said closure element.
Claim 7
Dependent Claim
22 words
A filter as defined in claim 1 wherein said spacer sections have different, thicknesses thereby to control the bandwidth of the filter.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |