US3634783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide load
Assignee: PREMIER MICROWAVE OF CALIFORNIA Inc
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Filing: 1970-04-13
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Granted: 1972-01-11
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Expires: 1990-04-13
Abstract
Abstract A rectangular waveguide load is disclosed. The broad walls of a rectangular waveguide are periodically loaded by means of corrugations to define a slow wave structure. The walls of the waveguide are made of a material having a loss tangent which is no less than the loss tangent of stainless steel for decreasing the physical length of the load. The height and width of the waveguide may be tapered as well as the depth of the corrugations for increasing the attenuation per unit length.
Inventors
- 👤 John P Rooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/24; H01P1/26; H01P1/264
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
In a waveguide load having a certaIn operating band of frequencies, a hollow rectangular waveguide means having a pair of broad top and bottom walls interconnected by a pair of narrow sidewalls, said walls of said waveguide means having a loss tangent for wave energy at the center frequency operating band of frequencies as averaged over its interior surfaces which is no less than the loss tangent of 18-8 stainless steel, and reactive loading means periodically loading at least one of said walls of said waveguide means for introducing an upper cutoff frequency and lowering the phase velocity of wave energy within the operating band of the load, whereby the physical length of the load is decreased for a given amount of attenuation of wave energy within the operating band.
Claim 2
Dependent Claim
130 words
In a waveguide load having a certaIn operating band of frequencies, a hollow rectangular waveguide means having a pair of broad top and bottom walls interconnected by a pair of narrow sidewalls, said walls of said waveguide means having a loss tangent for wave energy at the center frequency operating band of frequencies as averaged over its interior surfaces which is no less than the loss tangent of 18-8 stainless steel, and reactive loading means periodically loading at least one of said walls of said waveguide means for introducing an upper cutoff frequency and lowering the phase velocity of wave energy within the operating band of the load, whereby the physical length of the load is decreased for a given amount of attenuation of wave energy within the operating band.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 including means at one end of said rectangular waveguide means for coupling said rectangular waveguide means to a waveguide to be loaded.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2 including waveguide reflective means at a second end of said rectangular waveguide means for providing a wave reflective termination for said waveguide means.
Claim 5
Dependent Claim
24 words
The apparatus of claim 2 wherein said loading means comprises a corrugation of at least one of said broad walls of said waveguide means.
Claim 6
Dependent Claim
38 words
The apparatus of claim 1 wherein at least one of said broad walls of said waveguide means is made of a material having a loss tangent which is no less than the loss tangent of 18-8 stainless steel.
Claim 7
Dependent Claim
25 words
The apparatus of claim 1 wherein said loading means comprises a transverse corrugation of both said top and bottom broad walls of said waveguide means.
Claim 8
Dependent Claim
37 words
The apparatus of claim 2 wherein the height of said waveguide means between said top and bottom broad walls is tapered with decreasing height taken in a direction along said waveguide means away from said coupling means.
Claim 9
Dependent Claim
36 words
The apparatus of claim 2 wherein the width of said waveguide means between said pair of narrow sidewalls is tapered with decreasing width taken in a direction along said waveguide means away from said coupling means.
Claim 10
Dependent Claim
37 words
The apparatus of claim 2 wherein said periodic loading means has tapered dimensions such as to provide larger periodic loading to said waveguide means taken in the direction along said waveguide means away from said coupling means.
Claim 11
Dependent Claim
33 words
The apparatus of claim 4 wherein the depth of successive ones of said corrugations in said broad wall increases taken in a direction away from said coupling means and along said waveguide means.
Claim 12
Dependent Claim
24 words
The apparatus of claim 3 wherein said wave reflective means comprises a conductive wall closing off the second end of said rectangular waveguide means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |