US3573674A
Expired / Lapsed
US
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Tailored response microwave filter
Assignee: United States Department of the Navy
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Filing: 1969-04-30
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Granted: 1971-04-06
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Expires: 1989-04-30
Abstract
Abstract A multiple section microwave filter capable of being accurately tailored to special frequency response requirements over wide bandwidths in disclosed. The tailored response filter consists of an array of cascaded traveling-wave directional filters. Each filter section couples power out of a through transmission line into suitable microwave terminations. Due to the directional characteristics of traveling-wave directional filters, there is no interaction between sections. Thus the frequency response of the array is the product of the transfer functions of the individual sections. The coupling constants and the center frequencies of individual filter sections are tailored, i.e., synthesized, to result in a set of individual transfer functions which will produce the desired overall response. The tailored response filter can be used in wide bandwidth microwave systems for phase and amplitude weighting and for equalization functions.
Inventors
- 👤 Donald R Wehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:32
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
250 words
A microwave tailored response filter for use over a wide bandwidth comprising: a. a through transmission line having an input port and an output port for receiving and transmitting microwave energy; b. an array of traveling-wave directional filters each having a different center frequency; c. each of said directional filters consisting of a resonant loop, said resonant loop having associated therewith first and second quarter-wave directional couplers, said loop and said couplers both having the same center frequency within the bandwidth of interest; d. said first directional couplers being disposed and arranged in a cascaded manner along said transmission line in an energy coupling relationship thereto; e. said first directional couplers coupling a predetermined amount of energy out of said transmission line into its corresponding resonant loop, said amount being a function of the coupling coefficient C2n existing between said first directional couplers and said transmission line; f. each resonant loop circulating the energy within it in a resonating fashion; g. each of said second directional couplers being disposed and arranged in a cascaded manner and in an energy coupling relationship with respect to its corresponding resonant loop; h. each of said second directional couplers coupling a predetermined amount of energy out of its corresponding resonant loop, said amount being a function of the coupling coefficient C1n existing between each of said second directional couplers and its corresponding resonant loop; and i. attenuation means associated with each of said second directional couplers for dissipating the energy coupled into said coupler.
Claim 2
Dependent Claim
250 words
A microwave tailored response filter for use over a wide bandwidth comprising: a. a through transmission line having an input port and an output port for receiving and transmitting microwave energy; b. an array of traveling-wave directional filters each having a different center frequency; c. each of said directional filters consisting of a resonant loop, said resonant loop having associated therewith first and second quarter-wave directional couplers, said loop and said couplers both having the same center frequency within the bandwidth of interest; d. said first directional couplers being disposed and arranged in a cascaded manner along said transmission line in an energy coupling relationship thereto; e. said first directional couplers coupling a predetermined amount of energy out of said transmission line into its corresponding resonant loop, said amount being a function of the coupling coefficient C2n existing between said first directional couplers and said transmission line; f. each resonant loop circulating the energy within it in a resonating fashion; g. each of said second directional couplers being disposed and arranged in a cascaded manner and in an energy coupling relationship with respect to its corresponding resonant loop; h. each of said second directional couplers coupling a predetermined amount of energy out of its corresponding resonant loop, said amount being a function of the coupling coefficient C1n existing between each of said second directional couplers and its corresponding resonant loop; and i. attenuation means associated with each of said second directional couplers for dissipating the energy coupled into said coupler.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |