US4429290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexi-bend corrugated waveguide
Assignee: United States Department of the Navy
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Filing: 1979-10-29
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Granted: 1984-01-31
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Expires: 1999-10-29
Abstract
Abstract An unsymmetrically corrugated TE 01 mode circular waveguide bend. Unsetrical corrugations approximately one-quarter wavelength deep are utilized to suppress energy transfer to other modes inherent in smooth wall circular guide bends. The corrugations are comprised of a plurality of adjacent internal ridges and valleys having substantially parallel walls such that the distance between the parallel walls of the internal ridges are at least twice the distance between the parallel walls of the internal valleys.
Inventors
- 👤 Joseph M. Devan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:11
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
In a circular waveguide for propagating electromagnetic energy, in the TE 01 mode, the improvement comprising: a pipe having corrugated walls, said corrugated walls comprising a plurality of adjacent internal ridges and valleys, having substantially parallel walls, the distance between said substantially parallel walls of said ridges being at least twice the distance between said substantially parallel walls of said valleys.
Claim 2
Dependent Claim
61 words
In a circular waveguide for propagating electromagnetic energy, in the TE 01 mode, the improvement comprising: a pipe having corrugated walls, said corrugated walls comprising a plurality of adjacent internal ridges and valleys, having substantially parallel walls, the distance between said substantially parallel walls of said ridges being at least twice the distance between said substantially parallel walls of said valleys.
Claim 3
Dependent Claim
12 words
The waveguide of claim 1 wherein said corrugated walls comprise copper walls.
Claim 4
Dependent Claim
16 words
The waveguide of claim 2 wherein the external surfaces of said pipe are coated with nickel.
Claim 5
Dependent Claim
63 words
In a circular waveguide for propagating electromagnetic energy in the TE 01 mode, the improvement comprising: a metallic pipe having corrugated walls, said corrugated walls comprising a plurality of adjacent, internal ridges and valleys having substantially parallel walls, the distance, S, between said substantially parallel walls of said ridges being greater than the distance, W, between said substantially parallel walls of said valleys.
Claim 6
Dependent Claim
63 words
In a circular waveguide for propagating electromagnetic energy in the TE 01 mode, the improvement comprising: a metallic pipe having corrugated walls, said corrugated walls comprising a plurality of adjacent, internal ridges and valleys having substantially parallel walls, the distance, S, between said substantially parallel walls of said ridges being greater than the distance, W, between said substantially parallel walls of said valleys.
Claim 7
Dependent Claim
7 words
The waveguide of claim 4 wherein S≧2W.
Claim 8
Dependent Claim
13 words
The waveguide of claim 4 wherein said waveguide is comprised of electroformed copper.
Claim 9
Dependent Claim
16 words
The waveguide of claim 6 wherein the external surfaces of said pipe are coated with nickel.
Claim 10
Dependent Claim
91 words
A waveguide comprising: means comprising a metallic pipe having a circular cross section for propagating electromagnetic energy in the TE 01 mode; said metallic pipe having means for suppressing the propagation of electromagnetic energy through said waveguide in modes other than said TE 01 mode, said suppressing means comprising a plurality of internal ridges and valleys formed in said metallic pipe and having substantially parallel walls, the distance, S, between said substantially parallel walls of said ridges being greater than the distance, W, between said substantially parallel walls of said valleys.
Claim 11
Dependent Claim
91 words
A waveguide comprising: means comprising a metallic pipe having a circular cross section for propagating electromagnetic energy in the TE 01 mode; said metallic pipe having means for suppressing the propagation of electromagnetic energy through said waveguide in modes other than said TE 01 mode, said suppressing means comprising a plurality of internal ridges and valleys formed in said metallic pipe and having substantially parallel walls, the distance, S, between said substantially parallel walls of said ridges being greater than the distance, W, between said substantially parallel walls of said valleys.
Claim 12
Dependent Claim
7 words
The waveguide of claim 8 wherein S≧2W.
Claim 13
Dependent Claim
30 words
The waveguide of claim 8 wherein said modes other than said TE 01 mode include the TE 1 ,1, TM 0 ,1, TE 2 ,1 and TM 1 ,1 modes.
Claim 14
Dependent Claim
29 words
The waveguide of claims 1, 4 or 8 wherein the depth of said walls is approximately λ/4 where λ is the wavelength at the operating frequency of said waveguide.
References Cited (Backward Citations)
US3372352A
Cited
US4147185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |