Patent US3705407A successfully refreshed from Google Patents.
US3705407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio surface wave antenna
Assignee: SRI International Inc
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Filing: 1970-09-21
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Granted: 1972-12-05
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Expires: 1990-09-21
Abstract
Abstract An antenna for radio surface waves may be constructed from a conductor such as a tube or a flat plate which is an even multiple of wavelengths long. There is a discontinuity or gap in the conductor about one-quarter wavelength from one end, which is on the order of one-fourth inch. The antenna is normally supported from 3 to 12 inches above the earth''s surface and is excited longitudinally by a transverse electromagnetic mode (TEM) by connecting a source of excitation to the surface of the tube on both sides of the discontinuity, or to the surface of the flat plate on both sides of the discontinuity.
Inventors
- 👤 Arthur F Wickersham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:44
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q11/00; H01Q11/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A radio surface wave launcher comprising: a conductive surface having an overall length on the order of an even multiple of a number of wavelengths at the frequency desired for transmitting radio surface waves, there being a gap in said conductive surface at a distance from one end of said conductive surface on the order of one-quarter wavelength of the frequency of said radio surface waves, means for insulatingly supporting said entire conductive surface above and substantially parallel to the surface of the earth, and means for applying radio surface wave excitation to said conductive surface on either side of said gap.
Claim 2
Dependent Claim
102 words
A radio surface wave launcher comprising: a conductive surface having an overall length on the order of an even multiple of a number of wavelengths at the frequency desired for transmitting radio surface waves, there being a gap in said conductive surface at a distance from one end of said conductive surface on the order of one-quarter wavelength of the frequency of said radio surface waves, means for insulatingly supporting said entire conductive surface above and substantially parallel to the surface of the earth, and means for applying radio surface wave excitation to said conductive surface on either side of said gap.
Claim 3
Dependent Claim
18 words
A radio surface wave launcher as recited in claim 1 wherein said conductive surface is a cylindrical surface.
Claim 4
Dependent Claim
17 words
A surface wave launcher as recited in claim 1 wherein said conductive surface is a flat surface.
Claim 5
Dependent Claim
43 words
A radio surface wave launcher as recited in claim 1 wherein there are included parasitic elements comprising a second and a third conductive surface placed adjacent the gap in said launcher conductor surface, parallel to said launcher and at an angle to earth.
Claim 6
Dependent Claim
76 words
A radio surface wave launcher comprising: a conductor cylinder having a length on the order of two wavelengths at the frequency at which said radio surface wave launcher is to be operated, and having a discontinuity at substantially one-quarter wavelength from one end thereof, means for insulatingly supporting said entire conductive cylinder above and substantially parallel to the earth, and means for energizing said radio surface wave launcher connected thereto at either side of said discontinuity.
Claim 7
Dependent Claim
76 words
A radio surface wave launcher comprising: a conductor cylinder having a length on the order of two wavelengths at the frequency at which said radio surface wave launcher is to be operated, and having a discontinuity at substantially one-quarter wavelength from one end thereof, means for insulatingly supporting said entire conductive cylinder above and substantially parallel to the earth, and means for energizing said radio surface wave launcher connected thereto at either side of said discontinuity.
Claim 8
Dependent Claim
95 words
A radio surface wave launcher as recited in claim 5 wherein there is included parasitic directors comprising: a first and second cylindrical conductor body positioned adjacent said radio surface wave launcher at the location of the gap therein, parallel thereto and spaced therefrom, one of said two cylindrical conductors being inclined upwards from the ground at an angle commencing from a point behind said radio surface wave launcher, the other conductive body being inclined upward from the ground at the same angle and from a location adjacent the gap of said radio surface wave launcher.
Claim 9
Dependent Claim
93 words
A radio surface wave launcher comprising: a flat rectangular conductive sheet having a length on the order of two wavelengths of the frequency at which it is desired to launch said radio surface waves, said sheet having a gap at a location which is substantially one-quarter wavelength at said excitation frequency from one end thereof, means for supporting saiD entire flat rectangular sheet insulatingly above and substantially parallel to the surface of the earth, and means for applying the desired excitation to said radio surface wave launcher on either side of said gap.
Claim 10
Dependent Claim
93 words
A radio surface wave launcher comprising: a flat rectangular conductive sheet having a length on the order of two wavelengths of the frequency at which it is desired to launch said radio surface waves, said sheet having a gap at a location which is substantially one-quarter wavelength at said excitation frequency from one end thereof, means for supporting saiD entire flat rectangular sheet insulatingly above and substantially parallel to the surface of the earth, and means for applying the desired excitation to said radio surface wave launcher on either side of said gap.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |