US3573681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical waveguide formed from dielectric ribbon having symmetrically disposed conductive strips on opposite sides
Assignee: AT&T Inc
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Filing: 1969-03-12
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Granted: 1971-04-06
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Expires: 1989-03-12
Abstract
Abstract A helix waveguide structure is adapted to printed circuit techniques. In particular, the wire helix of the prior art is replaced by pairs of helices printed on opposite sides of a low loss dielectric member. The structure is advantageously fabricated by printing conductive strips on both sides of a dielectric ribbon and winding the ribbon into helix form.
Inventors
- 👤 Stewart E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:56
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A transmission medium for guiding wave energy in the circular electric mode of wave propagation within a given band of frequencies comprising: an elongated dielectric ribbon member having a plurality of conductive strips symmetrically located on opposite surfaces thereof; and said ribbon and said strips disposed in a substantially helical configuration to form a helical waveguide; characterized in that: said strips Are conductively insulated from each other and have a center-to-center spacing of less than one-quarter wavelength of the highest frequency of said wave energy; the thickness of said ribbon is comparable to or greater than the spacing between the edges of adjacent strips, but less than one-half wavelength of said highest frequency wave energy; and in that an electrically lossy jacket overlays said helically wound ribbon and strips.
Claim 2
Dependent Claim
129 words
A transmission medium for guiding wave energy in the circular electric mode of wave propagation within a given band of frequencies comprising: an elongated dielectric ribbon member having a plurality of conductive strips symmetrically located on opposite surfaces thereof; and said ribbon and said strips disposed in a substantially helical configuration to form a helical waveguide; characterized in that: said strips Are conductively insulated from each other and have a center-to-center spacing of less than one-quarter wavelength of the highest frequency of said wave energy; the thickness of said ribbon is comparable to or greater than the spacing between the edges of adjacent strips, but less than one-half wavelength of said highest frequency wave energy; and in that an electrically lossy jacket overlays said helically wound ribbon and strips.
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |