Patent US5506592A successfully refreshed from Google Patents.
US5506592A
Expired / Lapsed
US
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Multi-octave, low profile, full instantaneous azimuthal field of view direction finding antenna
Assignee: OL Security LLC
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Filing: 1995-05-24
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Granted: 1996-04-09
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Expires: 2015-05-24
Abstract
Abstract An antenna which comprises a plurality of spaced apart antenna segments (1-8) which are electrically isolated from each other and form a conical antenna structure, an insulator (9) disposed between each of the antenna segments, a plurality of conductors (11), each coupled to a different one of the antenna segments, for sampling a predetermined parameter at the associated antenna segment and a ground plane (10) normal to the axis of the conical structure. The antenna segments are substantially pie-shaped. In a second embodiment of the invention, the antenna segments are disposed on an electrically insulating sheet, each of the antenna segments being flared at the corner regions thereof (22) remote from the apex of the conical structure. The space between each of the segments is a slot, the slot operational as a slot antenna when the segments on opposing sides of the slot are excited 180 degrees out of phase.
Inventors
- 👤 Alan D. MacDonald
- 👤 Landon Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:00
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q21/00; H01Q21/06; H01Q21/20; H01Q21/205
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
103 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex, said axis passing through said apex; (b) a solid non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; and (d) a ground plane normal to said axis.
Claim 2
Dependent Claim
103 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex, said axis passing through said apex; (b) a solid non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; and (d) a ground plane normal to said axis.
Claim 3
Dependent Claim
15 words
An antenna as set forth in claim 1 wherein said antenna segments are substantially pie-shaped.
Claim 4
Dependent Claim
13 words
An antenna as set forth in claim 2 wherein said insulator is polytetrafluoroethylene.
Claim 5
Dependent Claim
18 words
An antenna as set forth in claim 3 wherein each of said transmission lines is a coaxial cable.
Claim 6
Dependent Claim
18 words
An antenna as set forth in claim 2 wherein each of said transmission lines is a coaxial cable.
Claim 7
Dependent Claim
28 words
An antenna as set forth in claim 2 wherein each of said antenna segments is flared at the corner regions thereof remote from the apex of said structure.
Claim 8
Dependent Claim
19 words
An antenna as set forth in claim 2 wherein said antenna segments are disposed on an electrically insulating sheet.
Claim 9
Dependent Claim
28 words
An antenna as set forth in claim 7 wherein each of said antenna segments is flared at the corner regions thereof remote from the apex of said structure.
Claim 10
Dependent Claim
13 words
An antenna as set forth in claim 1 wherein said insulator is polytetrafluoroethylene.
Claim 11
Dependent Claim
18 words
An antenna as set forth in claim 9 wherein each of said transmission lines is a coaxial cable.
Claim 12
Dependent Claim
18 words
An antenna as set forth in claim 1 wherein each of said transmission lines is a coaxial cable.
Claim 13
Dependent Claim
19 words
An antenna as set forth in claim 1 wherein said antenna segments are disposed on an electrically insulating sheet.
Claim 14
Dependent Claim
28 words
An antenna as set forth in claim 12 wherein each of said antenna segments is flared at the corner regions thereof remote from the apex of said structure.
Claim 15
Dependent Claim
28 words
An antenna as set forth in claim 1 wherein each of said antenna segments is flared at the corner regions thereof remote from the apex of said structure.
Claim 16
Dependent Claim
18 words
An antenna as set forth in claim 1 wherein the bandwidth of said antenna is up to 36:1.
Claim 17
Dependent Claim
14 words
An antenna as set forth in claim 1 wherein said antenna structure is conical.
Claim 18
Dependent Claim
24 words
An antenna as set forth in claim 1 wherein said antenna has an instantaneous 360° field of view about the axis of said antenna.
Claim 19
Dependent Claim
26 words
An antenna as set forth in claim 1, further including a mode former responsive to signals on said transmission lines to provide direction finding information therefrom.
Claim 20
Dependent Claim
96 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) an insulator disposed between each of said antenna segments; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed along the edges of said antenna segments remote from the apex of said structure.
Claim 21
Dependent Claim
96 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) an insulator disposed between each of said antenna segments; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed along the edges of said antenna segments remote from the apex of said structure.
Claim 22
Dependent Claim
19 words
An antenna as set forth in claim 19 wherein said antenna segments are disposed on an electrically insulating sheet.
Claim 23
Dependent Claim
29 words
An antenna as set forth in claim 20 wherein said electromagnetic absorbent material extends along each of said segments on a portion thereof at the exterior of said segments.
Claim 24
Dependent Claim
28 words
An antenna as set forth in claim 19 wherein each of said antenna segments is flared at the corner regions thereof remote from the apex of said structure.
Claim 25
Dependent Claim
29 words
An antenna as set forth in claim 22 wherein said electromagnetic absorbent material extends along each of said segments on a portion thereof at the exterior of said segments.
Claim 26
Dependent Claim
117 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) a non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed on each of said segments at a portion thereof at the interior of said segments.
Claim 27
Dependent Claim
117 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) a non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed on each of said segments at a portion thereof at the interior of said segments.
Claim 28
Dependent Claim
47 words
An antenna as set forth in claim 24, an electromagnetic absorbent material disposed on each of said segments at a portion thereof at the interior of said segments wherein said antenna segments are substantially pie-shaped and wherein said antenna segments are disposed on an electrically insulating sheet.
Claim 29
Dependent Claim
29 words
An antenna as set forth in claim 25 wherein said electromagnetic absorbent material extends to an edge of each of said segments remote from the apex of said structure.
Claim 30
Dependent Claim
123 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex, said antenna segments being substantially pie-shaped; (b) a non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed on each of said segments at a portion thereof at the interior of said segments.
Claim 31
Dependent Claim
123 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex, said antenna segments being substantially pie-shaped; (b) a non-metallic insulating spacer disposed between each of said antenna segments, said insulator having a thickness no greater than 0.2 wavelength at the highest operating frequency of said antenna; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment; (d) a ground plane normal to said axis; and (e) an electromagnetic absorbent material disposed on each of said segments at a portion thereof at the interior of said segments.
Claim 32
Dependent Claim
29 words
An antenna as set forth in claim 27 wherein said electromagnetic absorbent material extends to an edge of each of said segments remote from the apex of said structure.
Claim 33
Dependent Claim
113 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) an insulator disposed between each of said antenna segments; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments, for transmitting signals indicative of a predetermined parameter at the associated antenna segment; and (d) a ground plane normal to said axis; (e) the space between each of said segments being a slot, said slot being operational as a slot antenna when said segments on opposing sides of said slot are excited or energized 180 degrees out of phase.
Claim 34
Dependent Claim
113 words
An antenna which comprises: (a) a plurality of spaced apart antenna segments disposed about an axis forming an antenna structure having an apex; (b) an insulator disposed between each of said antenna segments; (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of said antenna segments, for transmitting signals indicative of a predetermined parameter at the associated antenna segment; and (d) a ground plane normal to said axis; (e) the space between each of said segments being a slot, said slot being operational as a slot antenna when said segments on opposing sides of said slot are excited or energized 180 degrees out of phase.
Claim 35
Dependent Claim
15 words
An antenna as set forth in claim 29 wherein said antenna segments are substantially pie-shaped.
Claim 36
Dependent Claim
21 words
An antenna as set forth in claim 30 wherein said spaced apart antenna segments are disposed on an electrically insulating sheet.
Claim 37
Dependent Claim
21 words
An antenna as set forth in claim 29 wherein said spaced apart antenna segments are disposed on an electrically insulating sheet.
Claim 38
Dependent Claim
150 words
An antenna which comprises: (a) a first antenna structure having an axis and comprising: (i) a plurality of spaced apart first antenna segments disposed about said axis and extending in a first direction along said axis forming a first portion of said antenna; (ii) a first insulator disposed between each of said first antenna segments; (b) a second antenna structure coaxial with said axis comprising: (i) a plurality of spaced apart second antenna segments, electrically isolated from each other, forming a second portion of said antenna and extending in a direction opposite to the first direction; (ii) a second insulator disposed between each of said second antenna segments; and (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of at least one of said first and second antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment.
Claim 39
Dependent Claim
150 words
An antenna which comprises: (a) a first antenna structure having an axis and comprising: (i) a plurality of spaced apart first antenna segments disposed about said axis and extending in a first direction along said axis forming a first portion of said antenna; (ii) a first insulator disposed between each of said first antenna segments; (b) a second antenna structure coaxial with said axis comprising: (i) a plurality of spaced apart second antenna segments, electrically isolated from each other, forming a second portion of said antenna and extending in a direction opposite to the first direction; (ii) a second insulator disposed between each of said second antenna segments; and (c) a plurality of rf transmission lines, each of said transmission lines coupled to a different one of at least one of said first and second antenna segments for transmitting signals indicative of a predetermined parameter at the associated antenna segment.
Claim 40
Dependent Claim
15 words
An antenna as set forth in claim 33 wherein said antenna segments are substantially pie-shaped.
Claim 41
Dependent Claim
13 words
An antenna as set forth in claim 34 wherein said insulator is polytetrafluoroethylene.
Claim 42
Dependent Claim
18 words
An antenna as set forth in claim 35 wherein each of said transmission lines is a coaxial cable.
Claim 43
Dependent Claim
18 words
An antenna as set forth in claim 34 wherein each of said transmission lines is a coaxial cable.
Claim 44
Dependent Claim
13 words
An antenna as set forth in claim 33 wherein said insulator is polytetrafluoroethylene.
Claim 45
Dependent Claim
18 words
An antenna as set forth in claim 38 wherein each of said transmission lines is a coaxial cable.
Claim 46
Dependent Claim
18 words
An antenna as set forth in claim 33 wherein each of said transmission lines is a coaxial cable.
Claim 47
Dependent Claim
19 words
An antenna as set forth in claim 33 wherein said antenna segments are disposed on an electrically insulating sheet.
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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) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |