US3603905A
Expired / Lapsed
US
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Symmetrical flexible waveguide
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1969-09-09
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Granted: 1971-09-07
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Expires: 1989-09-09
Abstract
Abstract A waveguide twistable of the type which can be wound on a drum for simultaneously transmitting two mutually perpendicular linearly polarized electromagnetic waves comprises a metal tube which has a constant cross-sectional profile along its length. The profile is approximately square and has rounded corners and includes thin wall portions which extend along the entire length of the tube. The thin wall portions are appropriately shaped to maintain the profile substantially symmetrical with respect to imaginary mutually perpendicular lines drawn across the said profiles from the center of each square side when the waveguide is bent about a given radius of curvature, or twisted through a given torsional angle.
Inventors
- 👤 Erich Schuttloffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:01
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/14; Y; Y10; Y10S; Y10S138/00; Y10S138/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A twistable flexible waveguide of the type which can be wound on a drum for the simultaneous transmission of two mutually perpendicular, linearly polarized electromagnetic waves comprising: a thin-walled seamless aluminum tube having a cross-sectional profile which is constant along its length; said crosssectional profile of said tube having an inner periphery which is approximately square and has rounded corners, and an outer periphery which is formed with a continuous pattern; said thin wall of said tube having a thickness which varies along its cross-sectional profile so that it has a maximum thickness in the region of said rounded corners and a minimum thickness midway therebetween, whereby said cross-sectional profile is maintained substantially symmetrical with respect to imaGinary mutually perpendicular lines drawn across said cross-sectional profile from the center of each square side when the waveguide is bent about a given radius of curvature or twisted through a given torsional angle.
Claim 2
Dependent Claim
151 words
A twistable flexible waveguide of the type which can be wound on a drum for the simultaneous transmission of two mutually perpendicular, linearly polarized electromagnetic waves comprising: a thin-walled seamless aluminum tube having a cross-sectional profile which is constant along its length; said crosssectional profile of said tube having an inner periphery which is approximately square and has rounded corners, and an outer periphery which is formed with a continuous pattern; said thin wall of said tube having a thickness which varies along its cross-sectional profile so that it has a maximum thickness in the region of said rounded corners and a minimum thickness midway therebetween, whereby said cross-sectional profile is maintained substantially symmetrical with respect to imaGinary mutually perpendicular lines drawn across said cross-sectional profile from the center of each square side when the waveguide is bent about a given radius of curvature or twisted through a given torsional angle.
Claim 3
Dependent Claim
26 words
The combination of claim 1 wherein the opposite sides of the inner periphery of said cross-sectional profile includes surface portions which are parallel to each other.
Claim 4
Dependent Claim
21 words
The combination of claim 1 wherein the opposite sides of the inner periphery of said cross section includes symmetrical curved surfaces.
Claim 5
Dependent Claim
32 words
The combination of claim 3 wherein said curved surfaces form an inner periphery which deviates from the circular shape only sufficiently to constitute means for preventing undesired rotation of the fed-in waves.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |