US3779805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making waveguide mode filter
Assignee: AT&T Inc
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Filing: 1971-05-19
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Granted: 1973-12-18
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Expires: 1991-05-19
Abstract
Abstract A waveguide mode filter comprising a dielectric-lined waveguide having a series of electrically lossy vanes in the lining parallel to the waveguide axis dissipates longitudinal and radial current components produced by unwanted modes and thereby suppresses such modes. A method of forming the vanes includes the steps of flooding the dielectric-lined waveguide interior with a solution containing lossy particles, drawing a cutting head through the waveguide to slice the dielectric lining so that the solution flows into the incisions and is trapped therein, and drawing a wiper through the waveguide to remove the excess solution.
Inventors
- 👤 D Alsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:14
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; H; H01; H01P; H01P1/00; H01P1/16; H01P1/163
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
The method of claim 1 wherein said step of making incisions includes the steps of: mounting a plurality of cutters around the periphery of a mounting means; and drawing said mounting means through said lining so that said cutters slice said lining to form said incisions, said cutters holding said incisions open to permit said solution to flow therein adjacent said cutters, said incisions closing when said cutters are removed thereby squeezing excess solution therefrom.
Claim 2
Dependent Claim
49 words
The method of claim 2 wherein said cutters are resiliently mounted within said mounting means So that the depth of said incisions remains constant regardless of variations such as curvatures in said lining, and said cutters are adjustably mounted so that said depth of said incisions can be varied.
Claim 3
Dependent Claim
30 words
The method of claim 2 wherein said mounting means includes openings therethrough for allowing movement of said solution through said mounting means as said mounting means moves within said lining.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said solution comprises an epoxy containing carbon particles.
Claim 5
Dependent Claim
33 words
The method of claim 1 including the step of drying said interior of said lining subsequent to said removing step so that removal of solvents from said solution within said incisions is effected.
Claim 6
Dependent Claim
13 words
The method of claim 6 wherein said solution comprises a colloidal graphite suspension.
Claim 7
Dependent Claim
18 words
The method of claim 6 wherein said solution comprises an organic adhesive in solution containing carbon particles therein.
Claim 8
Dependent Claim
46 words
The method of claim 1 wherein said removing step comprises drawing a wiper through said lining, said wiper including a resilient wiping surface which contacts the inner surface of said lining around the entire periphery thereof so that said excess solution is removed from said lining.
Claim 9
Dependent Claim
33 words
The method of claim 1 wherein said lossy members have edges terminating at the inner surface of said lining so that said lining and said members present a substantially smooth and continuous surface.
Claim 10
Independent Claim
86 words
A method of forming a mode filter section from a waveguide containing a dielectric lining, comprising the steps of: flooding the interior of said lining with a solution containing particles of lossy material; forcing a plurality of cutters into said lining to form incisions therein so that said solution flows into said incisions; removing said cutters so that said incisions close thereby trapping a thin layer of said solution to form lossy members within said lining; and removing the excess of said solution from said interior.
Claim 11
Independent Claim
93 words
A method of forming a mode filter section from a waveguide containing a dielectric lining comprising the steps of: making incisions in said lining extending radially in said lining and in the direction of the longitudinal axis of said waveguide; filling said incisions with a lossy material; and removing the excess of said material from said interior of said lining so as to leave a thin layer of said material in said incisions which present substantial resistive paths to longitudinal and radial current components and a negligible resistive path to tangential current components.
Claim 12
Dependent Claim
23 words
The method of claim 12 wherein said filling step comprises injecting a solution containing particles of lossy material into said incisions under pressure.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |