Patent US3680131A successfully refreshed from Google Patents.
US3680131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile antenna mounted on a watercraft
Assignee: Bendix Corp
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Filing: 1970-11-16
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Granted: 1972-07-25
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Expires: 1990-11-16
Abstract
Abstract An omnidirectional, ultra high frequency transmitting antenna is disclosed having an unusually low profile and being of unusually rugged physical construction. A cylindrical monopole is attached to the outside conductor of a coaxial cable, and the center conductor is fastened to the apex of a conical dipole, with mechanical spacing and support between the dipoles being supplied by means of a ring of low loss dielectric material which provides dielectric loading for the antenna. With the dielectric loading, the height of the antenna can be made appreciably less than in the case of a conventional dipole antenna. A light flasher is incorporated into the cylindrical monopole as an aid in visually locating the antenna and associated equipment.
Inventors
- 👤 Roger D Hall
- 👤 David N Clasby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:02
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/40; H01Q9/16; H01Q9/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
An antenna structure for connection to a coaxial signal carrying conductor comprising a cylindrical monopole section of electrical conducting material, a circular plate closing one end of said cylindrical monopole section and a coaxial line termination device attached to said plate, with the outside or shield conductor connected to said plate and with the center conductor insulated from said plate, a conical monopole member connected at its apex to said center conductor, said conical monopole including a radially extending flange, a loading ring of dielectric material fixed between said flange and the outer edge of said plate, and ground plane means adjacent said cylindrical monopole section.
Claim 2
Dependent Claim
106 words
An antenna structure for connection to a coaxial signal carrying conductor comprising a cylindrical monopole section of electrical conducting material, a circular plate closing one end of said cylindrical monopole section and a coaxial line termination device attached to said plate, with the outside or shield conductor connected to said plate and with the center conductor insulated from said plate, a conical monopole member connected at its apex to said center conductor, said conical monopole including a radially extending flange, a loading ring of dielectric material fixed between said flange and the outer edge of said plate, and ground plane means adjacent said cylindrical monopole section.
Claim 3
Dependent Claim
36 words
An antenna structure as set forth in claim 1 wherein the distance along said center conductor between said plate and said apex is selected to provide an impedance match between said coaxial line and said antenna.
Claim 4
Dependent Claim
48 words
An antenna structure as set forth in claim 1 wherein said antenna is deployed on a water-borne device, a water-filled gap is located between said cylindrical monopole section and said ground plane means, and said ground plane means includes a substantial portion of the surface of said device.
Claim 5
Dependent Claim
24 words
An antenna structure as set forth in claim 3 wherein O-ring sealing means are carried on the side walls of said cylindrical monopole section.
Claim 6
Dependent Claim
23 words
An antenna structure as set forth in claim 1 wherein the thickness of said loading ring is a substantial proportion of its height.
Claim 7
Dependent Claim
40 words
An antenna structure as set forth in claim 1 wherein said circular plate has a plating layer on its side nearest said apex and conductors are soldered between said plating layer and the side walls of said cylindrical monopole section.
Claim 8
Dependent Claim
23 words
An antenna structure as set forth in claim 6 wherein illumination means is incorporated into the side wall of said cylindrical monopole section.
Claim 9
Dependent Claim
28 words
An antenna structure as set forth in claim 7 wherein said illuminated means includes a light-transmitting housing positioned adjacent said plate and an annular bulb in said housing.
Claim 10
Dependent Claim
187 words
For use with a water-borne vehicle, an antenna structure adapted to be carried within said vehicle and connected to a coaxial feed cable, said antenna having a surface flush with the surface of said vehicle when not deployed and which is urged out of the said surface when deployed, said antenna when deployed comprising: a cylindrical monopole section of electrically conducting material connected to the outside conductor of said coaxial feed cable including a circular plate, a conical monopole section axially aligned with said cylindrical monopole section connected at its apex to said center conductor including a radially extending flange, said flange including the said flush surface, said center conductor extending between the surface of said circular plate and said apex for a length selected to provide an impedance match between said coaxial feed cable and said antenna, a loading ring of low loss dielectric material fixed between said flange and the outer edge of said plate, and ground plane means for said antenna including at least a portion of the surface of said vehicle and a water-loaded slot between said surface and said cylindrical monopole section.
Claim 11
Dependent Claim
187 words
For use with a water-borne vehicle, an antenna structure adapted to be carried within said vehicle and connected to a coaxial feed cable, said antenna having a surface flush with the surface of said vehicle when not deployed and which is urged out of the said surface when deployed, said antenna when deployed comprising: a cylindrical monopole section of electrically conducting material connected to the outside conductor of said coaxial feed cable including a circular plate, a conical monopole section axially aligned with said cylindrical monopole section connected at its apex to said center conductor including a radially extending flange, said flange including the said flush surface, said center conductor extending between the surface of said circular plate and said apex for a length selected to provide an impedance match between said coaxial feed cable and said antenna, a loading ring of low loss dielectric material fixed between said flange and the outer edge of said plate, and ground plane means for said antenna including at least a portion of the surface of said vehicle and a water-loaded slot between said surface and said cylindrical monopole section.
Claim 12
Dependent Claim
29 words
An antenna structure as set forth in claim 9 wherein said antenna, when deployed, extends out of the surface of said vehicle a distance approximately equal to its diameter.
Claim 13
Dependent Claim
39 words
An antenna structure as set forth in claim 10 wherein said circular plate has a plating layer on its side nearest said apex and conductors are soldered between said plating layer and the side walls of said cylindrical monopole.
Claim 14
Dependent Claim
23 words
An antenna structure as set forth in claim 10 wherein illumination means is iNcorporated into the side wall of said cylindrical monopole section.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |