Multi-octave, low profile, full instantaneous azimuthal field of view direction finding antenna
First Claim
1. 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.
5 Assignments
0 Petitions
Accused Products
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.
96 Citations
41 Claims
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1. An antenna which comprises:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An antenna which comprises:
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(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. - View Dependent Claims (20, 21, 22, 23)
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24. An antenna which comprises:
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(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. - View Dependent Claims (25, 26)
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27. An antenna which comprises:
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(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. - View Dependent Claims (28)
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29. An antenna which comprises:
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(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. - View Dependent Claims (30, 31, 32)
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33. An antenna which comprises:
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(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. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41)
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Specification