US5061944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad-band high-directivity antenna
Assignee: Lockheed Martin Corp
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Filing: 1989-09-01
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Granted: 1991-10-29
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Expires: 2009-09-01
Abstract
Abstract This Yagi-Uda-type antenna includes also a sleeve embracing the dipole. The sleeve may be a closed cylindrical element surrounding the dipole or it may comprise a pair of discrete elements forming an "open sleeve". The dipole, sleeve, reflector, and director elements may be in filamentary form, or they may be fabricated from stripline.
Inventors
- 👤 Richard L. Powers
- 👤 Russell J. Cyr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:05
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/28; H01Q19/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
238 words
An antenna for transmitting or receiving electromagnetic energy throughout a band of frequencies, said antenna comprising: (a) a dipole element for orientation substantially in the direction of the electric vector of said transmitted or received electromagnetic energy, (b) transmission line means for connecting said dipole element to a source or receiver of electromagnetic energy, at least a portion of said transmission-line means adjacent to said dipole element being disposed substantially normal to said dipole element and substantially parallel to the general direction of passage of energy through said antenna, (c) at least one parasitic structure disposed substantially parallel to said dipole element so that two conductive portions of said structure are in a plane passing through said dipole element normal to said transmission-line means and to the general direction of energy through said antenna, said two conductive portions being on opposite sides of said dipole element and having lengths equal to at least half the length of said dipole element, (d) first and second conductive reflector elements disposed symmetrically with and substantially parallel to said dipole element and within one-quarter wavelength at the mean frequency of said band of frequencies of said transmission-line means, and (e) a plurality of conductive director elements respectively disposed substantially parallel to said dipole element in spaced relationship in a line away from said dipole element in a direction substantially opposite to the direction of said transmission line means from said dipole element.
Claim 2
Dependent Claim
238 words
An antenna for transmitting or receiving electromagnetic energy throughout a band of frequencies, said antenna comprising: (a) a dipole element for orientation substantially in the direction of the electric vector of said transmitted or received electromagnetic energy, (b) transmission line means for connecting said dipole element to a source or receiver of electromagnetic energy, at least a portion of said transmission-line means adjacent to said dipole element being disposed substantially normal to said dipole element and substantially parallel to the general direction of passage of energy through said antenna, (c) at least one parasitic structure disposed substantially parallel to said dipole element so that two conductive portions of said structure are in a plane passing through said dipole element normal to said transmission-line means and to the general direction of energy through said antenna, said two conductive portions being on opposite sides of said dipole element and having lengths equal to at least half the length of said dipole element, (d) first and second conductive reflector elements disposed symmetrically with and substantially parallel to said dipole element and within one-quarter wavelength at the mean frequency of said band of frequencies of said transmission-line means, and (e) a plurality of conductive director elements respectively disposed substantially parallel to said dipole element in spaced relationship in a line away from said dipole element in a direction substantially opposite to the direction of said transmission line means from said dipole element.
Claim 3
Dependent Claim
30 words
An antenna in accordance with claim 1, further including resonant-circuit means in said transmission-line means for substantially matching the impedance of said antenna to that of said source or receiver.
Claim 4
Dependent Claim
34 words
An antenna in accordance with claim 1 in which said parasitic structure disposed substantially parallel to said dipole element is in the form of a cylinder of which said two conductive portions are generatrices.
Claim 5
Dependent Claim
45 words
An antenna in accordance with claim 1 in which said parasitic structure disposed substantially parallel to said dipole element comprises a pair of linear elements on opposite sides of said dipole element in said plane passing through said dipole element normal to said transmission-line means.
Claim 6
Dependent Claim
50 words
An antenna in accordance with claim 1 in which the dimensions of said parasitic structure and of respective ones of said reflector and director elements are selected so that the operating frequency band extends approximately sixteen percent below and sixteen percent above the center point of said band of frequencies.
Claim 7
Dependent Claim
31 words
An antenna in accordance with claim 1, further including a substantially planar dielectric member for supporting said parasitic structure and said reflector and director elements at or near their respective midpoints.
Claim 8
Dependent Claim
12 words
An antenna in accordance with claim 1, having three conductive director elements.
Claim 9
Dependent Claim
12 words
An antenna in accordance with claim 1, having four conductive director elements.
Claim 10
Dependent Claim
53 words
An antenna in accordance with claim 1, further including at least one substantially planar dielectric member disposed in the direction of the electric vector of said transmitted or received electromagnetic energy and extending in the general direction of passage of energy through said antenna, said substantially planar dielectric member supporting said dipole element.
Claim 11
Dependent Claim
61 words
An antenna in accordance with claim 1, further including at least one substantially planar dielectric member disposed in the direction of the electric vector of said transmitted or received electromagnetic energy and extending in the general direction of passage of energy through said antenna, said substantially planar dielectric member supporting at least one of said parasitic conductive portions of said structure.
Claim 12
Dependent Claim
56 words
An antenna in accordance with claim 1, further including at least one substantially planar dielectric member disposed in the direction of the electric vector of said transmitted or received electromagnetic energy and extending in the general direction of passage of energy through said antenna, said substantially planar dielectric member supporting at least one conductive reflector element.
Claim 13
Dependent Claim
60 words
An antenna in accordance with claim 1, further including at least one substantially planar dielectric member disposed in the direction of the electric vector of said transmitted or received electromagnetic energy and extending in the general direction of passage of energy through said antenna, said substantially planar dielectric member supporting at least one of said plurality of conductive director elements.
Claim 14
Dependent Claim
25 words
An antenna in accordance with claim 9 in which said dipole element comprises conductive material applied to the surface of said substantially planar dielectric member.
Claim 15
Dependent Claim
29 words
An antenna in accordance with claim 10 in which said conductive portions of said parasitic structure comprise conductive material applied to the surface of said substantially planar dielectric member.
Claim 16
Dependent Claim
33 words
An antenna in accordance with claim 10 in which said conductive portions of said parasitic structure are stripline having a substantial dimensional component in the direction of passage of energy through said antenna.
Claim 17
Dependent Claim
30 words
An antenna in accordance with claim 11 in which at least one of said conductive reflector elements comprises conductive material applied to the surface of said substantially planar dielectric member.
Claim 18
Dependent Claim
28 words
An antenna in accordance with claim 12 in which said plurality of conductive director elements comprise conductive material applied to the surface of said substantially planar dielectric member.
Claim 19
Dependent Claim
16 words
An antenna in accordance with claim 9 in which there are two substantially planar dielectric members.
Claim 20
Dependent Claim
42 words
An antenna in accordance with claim 18 in which the dipole element and one conductive portion of said parasitic structure are supported by one dielectric member, while the other conductive portion of said parasitic structure is supported by the other dielectric member.
Claim 21
Dependent Claim
16 words
An antenna in accordance with claim 2 in which said resonant circuit means comprise a balun.
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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) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |