Patent US5600340A successfully refreshed from Google Patents.
US5600340A
Expired / Lapsed
US
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Wideband omni-directional antenna
Assignee: United States Department of the Navy
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Filing: 1995-04-13
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Granted: 1997-02-04
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Expires: 2015-04-13
Abstract
Abstract An omni-directional antenna is provided which comprises: 1) a first prolate spheroid having an electrically conductive first outer surface and a first center axis, 2) a second prolate spheroid having an electrically conductive second outer surface and a second center axis, 3) a structural member for supporting the first prolate spheroid a fixed distance from the second prolate spheroid so that the first and second center axes are coincident, 4) a first resistive ring mounted to the surface of the first prolate spheroid; 5) a second resistive ring mounted to the surface of the second prolate spheroid; and 5) a coaxial cable having an outer conductor electrically connected to the second surface of the second prolate spheroid and a center conductor electrically connected to the first surface of the first prolate spheroid.
Inventors
- 👤 Thinh Q. Ho
- 👤 John W. Rockway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:34
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q1/00; H01Q1/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
An omni-directional antenna, comprising: a first spheroid having an electrically conductive first outer surface and a first center axis; a second spheroid having an electrically conductive second outer surface and a second center axis; a structural member for supporting said first spheroid a fixed distance from said second spheroid so that said first and second center axes are generally coincident; first resistive ring mounted to said first outer surface; a second resistive ring mounted to said second outer surface; a first electrical conductor directly connected to said second spheroid; and a second electrical conductor directly connected to said first spheroid and electrically insulated from said first electrical conductor.
Claim 2
Dependent Claim
108 words
An omni-directional antenna, comprising: a first spheroid having an electrically conductive first outer surface and a first center axis; a second spheroid having an electrically conductive second outer surface and a second center axis; a structural member for supporting said first spheroid a fixed distance from said second spheroid so that said first and second center axes are generally coincident; first resistive ring mounted to said first outer surface; a second resistive ring mounted to said second outer surface; a first electrical conductor directly connected to said second spheroid; and a second electrical conductor directly connected to said first spheroid and electrically insulated from said first electrical conductor.
Claim 3
Dependent Claim
17 words
The omni-directional antenna of claim 1 wherein said first and second outer surfaces have an exponential profile.
Claim 4
Dependent Claim
17 words
The omni-directional antenna of claim 1 wherein said first and second outer surfaces have a cosine profile.
Claim 5
Dependent Claim
25 words
The omni-directional antenna of claim 1 wherein said first spheroid has an outside diameter approximately equal to 2λ, where λ represents a radio frequency wavelength.
Claim 6
Dependent Claim
25 words
The omni-directional antenna of claim 1 wherein said second spheroid has an outside diameter approximately equal to 2λ, where λ represents a radio frequency wavelength.
Claim 7
Dependent Claim
16 words
The omni-directional antenna of claim 1 in which said first and second spheroids are oblate spheroids.
Claim 8
Dependent Claim
94 words
An omni-directional antenna, comprising: a spheroid having an electrically conductive outer surface and a first center axis; an electrically conductive ground plate having a perpendicular axis; a structural member for supporting said spheroid a fixed distance from said ground plate so that said first axis and said perpendicular axis are generally coincident; a resistive ring mounted to the outer surface of said spheroid; a first electrical conductor directly connected to said surface of said spheroid; and a second electrical conductor directly connected to said ground plate and electrically insulated from said first electrical conductor.
Claim 9
Dependent Claim
94 words
An omni-directional antenna, comprising: a spheroid having an electrically conductive outer surface and a first center axis; an electrically conductive ground plate having a perpendicular axis; a structural member for supporting said spheroid a fixed distance from said ground plate so that said first axis and said perpendicular axis are generally coincident; a resistive ring mounted to the outer surface of said spheroid; a first electrical conductor directly connected to said surface of said spheroid; and a second electrical conductor directly connected to said ground plate and electrically insulated from said first electrical conductor.
Claim 10
Dependent Claim
14 words
The omni-directional antenna of claim 7 wherein said outer surface has an exponential taper.
Claim 11
Dependent Claim
14 words
The omni-directional antenna of claim 7 wherein said outer surface has a cosine taper.
Claim 12
Dependent Claim
24 words
The omni-directional antenna of claim 7 wherein said spheroid has an outside diameter approximately equal to 2λ, where λ represents a radio frequency wavelength.
Claim 13
Dependent Claim
25 words
The omni-directional antenna of claim 7 wherein said ground plate has an outside diameter approximately equal to 2λ, where λ represents a radio frequency wavelength.
Claim 14
Dependent Claim
14 words
The omni-directional antenna of claim 7 in which said spheroid is a oblate spheroid.
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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) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |