Patent US4406925A successfully refreshed from Google Patents.
US3601720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical waveguide with varied wall impedance zones
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1968-08-13
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Granted: 1971-08-24
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Expires: 1988-08-13
Abstract
Abstract Manufacturing methods of the helical waveguide that the wall impedance of the wall structure of the waveguide is alternated discontinuously or continuously in the direction of the axis of the helix by means that jacket or tape of insulating or lossy material having diverse dielectric constants, or roving of lossy material is located on the helix of the waveguide to make the wall structure having the alternated wall impedance and their products.
Inventors
- 👤 Tsuneo Nakahara
- 👤 Masao Hoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:04
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/13
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, said wall impedance values being substantially uniform over each of said zones, the axial length of each of said zones being large compared to the wavelength to be used.
Claim 2
Dependent Claim
66 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, said wall impedance values being substantially uniform over each of said zones, the axial length of each of said zones being large compared to the wavelength to be used.
Claim 3
Dependent Claim
81 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have differEnt wall impedance values, said jacket made of a plurality of tubes of insulating material, any two adjacent ones of which have different dielectric constants, the axial length of each of said tubes being sufficiently longer than the wavelength in use, and a lossy layer surrounding said tubes.
Claim 4
Dependent Claim
81 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have differEnt wall impedance values, said jacket made of a plurality of tubes of insulating material, any two adjacent ones of which have different dielectric constants, the axial length of each of said tubes being sufficiently longer than the wavelength in use, and a lossy layer surrounding said tubes.
Claim 5
Dependent Claim
13 words
The helical waveguide of claim 1 wherein said helical conductor wire is insulated.
Claim 6
Dependent Claim
69 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of a helical wound tape having different adjacent electrically dissipative zones therealong.
Claim 7
Dependent Claim
69 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of a helical wound tape having different adjacent electrically dissipative zones therealong.
Claim 8
Dependent Claim
84 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of a roving of electrically dissipative material helically and alternately wound densely and sparsely in adjacent longitudinal zones respectively on said helix to alternately provide said zones.
Claim 9
Dependent Claim
84 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of a roving of electrically dissipative material helically and alternately wound densely and sparsely in adjacent longitudinal zones respectively on said helix to alternately provide said zones.
Claim 10
Dependent Claim
92 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of an insulative tape helically wound on said helix and having a plurality of different zones therealong of different dielectric constants, each of said tape zones being sufficiently long to provide said axially arranged zones.
Claim 11
Dependent Claim
92 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, the axial length of each of said zones being large compared to the wavelength to be used, said jacket consisting of an insulative tape helically wound on said helix and having a plurality of different zones therealong of different dielectric constants, each of said tape zones being sufficiently long to provide said axially arranged zones.
Claim 12
Dependent Claim
20 words
A helical waveguide as claimed in claim 6 wherein said tape zones graduate one into the other without abrupt change.
Claim 13
Dependent Claim
89 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, said jacket consisting of a plurality of tapes wound helically in parallel over said conductive wire, each tape being made of insulating material having different dielectric constants than another, the width of each of said tapes being sufficiently longer than the wavelength in use, and a lossy jacket surrounding said insulating jacket.
Claim 14
Dependent Claim
89 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which has a plurality of axially arranged zones, any two adjacent ones of which have different wall impedance values, said jacket consisting of a plurality of tapes wound helically in parallel over said conductive wire, each tape being made of insulating material having different dielectric constants than another, the width of each of said tapes being sufficiently longer than the wavelength in use, and a lossy jacket surrounding said insulating jacket.
Claim 15
Dependent Claim
67 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which is made of a plurality of tubes of insulating material, any two adjacent ones of which have substantially the same dielectric constant and different thicknesses, the axial length of each of said tubes being sufficiently longer than the wavelength in use, and a lossy layer surrounding said tubes.
Claim 16
Dependent Claim
67 words
A helical waveguide comprising a conductive wire wound in a substantially helical form, a jacket over said helix which is made of a plurality of tubes of insulating material, any two adjacent ones of which have substantially the same dielectric constant and different thicknesses, the axial length of each of said tubes being sufficiently longer than the wavelength in use, and a lossy layer surrounding said tubes.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |