Patent US3593221A successfully refreshed from Google Patents.
US3593221A
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US
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Means for designing a fixed tuned, direct-coupled filter
Assignee: United States Department of the Navy
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Filing: 1970-02-17
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Granted: 1971-07-13
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Expires: 1990-02-17
Abstract
Abstract Means for precise design of a direct-coupled resonant filter without the use of adjustable tuning devices. The filter is of the type using a series of reactive obstacles within a waveguide (or transmission and, finally, each obstacle and its associated waveguide section forming a quarter-wave transformer stage. The overall design is approximately calculated on paper; each quarter-wave transformer stage is resonated by charting the effect of moving the positions of the obstacles and thus determining the precise positioning for the desired frequency and Q; and, finally the stages are fitted together by making the reference plane of each previous stage coincide with the reference plane of its succeeding stage so that reflections are minimized.
Inventors
- 👤 John Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:46
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A method for designing a fixed tuned, direct-coupled plural stage resonant filter for use with transmission guidelines comprising the steps of: determining from proper formulas the approximate desired filter including the susceptances of the reactive obstacles for each stage and the number of stages required for a direct-coupled filter with the desired electrical characteristics; determining for each set of obstacles the spacings and dimensions of the obstacles and the guideline which are required to form a quarter-wavelength transformer stage at the center frequency of the desired passband, the reference plane for each set of obstacles (the reference plane of an obstacle being the plane at which the input voltage maximum will occur) and its associated length of guideline also being determined; and fitting together the individual stages to form the complete filter, individual stages being fitted together so that the distance between successive sets of obstacles is the arithmetic mean of the distances from each set of obstacles to a common reference plane therebetween.
Claim 2
Independent Claim
164 words
A method for designing a fixed tuned, direct-coupled plural stage resonant filter for use with transmission guidelines comprising the steps of: determining from proper formulas the approximate desired filter including the susceptances of the reactive obstacles for each stage and the number of stages required for a direct-coupled filter with the desired electrical characteristics; determining for each set of obstacles the spacings and dimensions of the obstacles and the guideline which are required to form a quarter-wavelength transformer stage at the center frequency of the desired passband, the reference plane for each set of obstacles (the reference plane of an obstacle being the plane at which the input voltage maximum will occur) and its associated length of guideline also being determined; and fitting together the individual stages to form the complete filter, individual stages being fitted together so that the distance between successive sets of obstacles is the arithmetic mean of the distances from each set of obstacles to a common reference plane therebetween.
References Cited (Backward Citations)
US2630533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |