US3824504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave filter
Assignee: Westinghouse Electric Corp
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Filing: 1973-09-07
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Granted: 1974-07-16
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Expires: 1993-09-07
Abstract
Abstract A microwave filter adaptable to suppress the even harmonics of a predetermined fundamental frequency of energy processed in a waveguide. The filter consists of a slanting conductor, for example a wire, connected between the top and bottom walls of a rectangular waveguide such that its ends contact the waveguide at points one half of a guide wavelength apart of the fundamental frequency along the length of the waveguide.
Inventors
- 👤 W Parris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/212; H01P1/16; H01P1/207
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A microwave filter for the even harmonic frequencies of at least one predetermined fundamental frequency propagated in a waveguide, comprising in combination: waveguide transmission line means; and electrical conductor means centrally located in said waveguide transmission line means, extending longitudinally on a slant between opposing conductive surface portions of said waveguide transmission line means and having the ends respectively electrically contacting said opposing conductive surface portions at points along the length of the waveguide transmission line means spaced substantially one half wavelength apart of said at least one predetermined fundamental frequency.
Claim 2
Dependent Claim
91 words
A microwave filter for the even harmonic frequencies of at least one predetermined fundamental frequency propagated in a waveguide, comprising in combination: waveguide transmission line means; and electrical conductor means centrally located in said waveguide transmission line means, extending longitudinally on a slant between opposing conductive surface portions of said waveguide transmission line means and having the ends respectively electrically contacting said opposing conductive surface portions at points along the length of the waveguide transmission line means spaced substantially one half wavelength apart of said at least one predetermined fundamental frequency.
Claim 3
Dependent Claim
17 words
The microwave filter as defined by claim 1 wherein said electrical conductor means comprises a wire conductor.
Claim 4
Dependent Claim
27 words
The microwave filter as defined by claim 1 wherein said electrical conductor means comprises at least one wire conductor having a circular cross section of predetermined diameter.
Claim 5
Dependent Claim
27 words
The microwave filter as defined by claim 1 wherein said electrical conductor means comprises a plurality of wire conductors of unequal length arranged in a common plane.
Claim 6
Dependent Claim
49 words
A microwave filter As defined by claim 1 wherein said waveguide transmission line means comprises a rectangular waveguide having opposing narrow and broad conducting walls, and said electrical conductor means comprises a wire conductor electrically contacting opposing broadwalls and extending in the central longitudinal plane of said rectangular waveguide.
Claim 7
Dependent Claim
77 words
The microwave filter as defined by claim 1 wherein said waveguide transmission line means comprises a rectangular waveguide having opposing narrow and braod conducting walls, and wherein said electrical conductor means comprises a sheet of metallic conductor of substantially constant thickness and having one edge dimension greater than the other edge dimension, said edge dimensions terminating in and contacting the opposing broadwalls of said rectangular waveguide and lying in a substantially central longitudinal plane of said waveguide.
Claim 8
Dependent Claim
26 words
The filter as defined by claim 6 wherein said sheet of metallic conductor comprises a wedge shaped element having side edge dimensions of predetermined unequal lengths.
Claim 9
Dependent Claim
89 words
The microwave filter as defined by claim 1 wherein said waveguide transmission line means comprises a rectangular waveguide having opposing narrow and broadwalls, and wherein said electrical conductor means comprises a plurality of wire conductors of having predetermined unequal lengths and having one corresponding end contacting substantially the same surface portion of one of said broadwalls and the other corresponding end contacting the opposite broad conducting wall, and wherein the plurality of wire conductors lie in a common plane running substantially along the central longitudinal axis of said waveguide.
Claim 10
Dependent Claim
90 words
The microwave filter as defined by claim 1 wherein said waveguide transmission line means comprises a rectangular waveguide having opposing narrow and broad walls, and wherein said electrical conductor means comprises a plurality of wire conductor means of predetermined unequal lengths electrically contacting opposing broadwall conductive portions, lying in a common plane extending substantially along the central longitudinal axis of said waveguide and wherein said plurality of electrical conductors have the same corresponding ends contacting the same broadwall at spaced intervals of substantially a quarter wavelength of a predetermined frequency.
Claim 11
Dependent Claim
80 words
The microwave filter as defined by claim 1 wherein said waveguide transmission line means comprises coaxial waveguide having inner and outer circular waveguides, and wherein said electrical conductor means comprises a plurality of wire conductors of substantially equal lengths extending from the inner conducting surface of said outer waveguide to the outer conducting surface of said inner waveguide, said wire conductors being separated from one another but positioned at substantially the same location along the lengthwise dimension of said waveguide.
Claim 12
Dependent Claim
55 words
The microwave filter as defined by claim 10 wherein said plurality of wire conductors comprises four conductors of substantially equal lengths and wherein two conductors lie in a first central longitudinal plane running through said waveguide and the other two conductors lie in a second central longitudinal plane substantially orthogonal with the first recited plane.
References Cited (Backward Citations)
US2425345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |