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US5691734A
Expired / Lapsed
US
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Dual polarizating antennae
Assignee: Alan Dick and Co Ltd
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Filing: 1995-06-01
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Granted: 1997-11-25
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Expires: 2015-06-01
Abstract
Abstract A dual polarization antenna includes a non-conducting space surrounded by a ground plane. Two angularly offset sets of dipole structures penetrate into the space. Each set of dipole structures comprises a pair of aligned short circuit elongate dipoles extending from the ground plane into the space from diametrically opposed directions and terminating in respective free ends. The free ends are adjacent, but spaced from each other, to define a gap between them. At least one separate device is provided for exciting each set of dipole structures or each dipole structure within a set individually. A radiating element is provided overlying the dipole structures such that the dipole structures couple, in use, with the radiating element, causing the radiating element to radiate polarizations determined by the orientation of each of the sets of dipole structures.
Inventors
- 👤 Richard Simon Greville Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:17
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/045
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
127 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane; two angularly offset sets of dipole structures penetrating into the space, each set having an orientation and comprising a pair of aligned short circuit elongate dipoles extending from the ground plane into the space from diametrically opposed directions to terminate in respective free ends such that said free ends are adjacent but spaced from each other to define a gap between them; separate means for exciting each set, or dipole structure within a set, individually and a radiating element overlying the dipole structures such that the dipole structures couple, in use, with the radiating element, causing said radiating element to radiate polarizations determined by the orientation of each of said sets of dipole structures.
Claim 2
Dependent Claim
127 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane; two angularly offset sets of dipole structures penetrating into the space, each set having an orientation and comprising a pair of aligned short circuit elongate dipoles extending from the ground plane into the space from diametrically opposed directions to terminate in respective free ends such that said free ends are adjacent but spaced from each other to define a gap between them; separate means for exciting each set, or dipole structure within a set, individually and a radiating element overlying the dipole structures such that the dipole structures couple, in use, with the radiating element, causing said radiating element to radiate polarizations determined by the orientation of each of said sets of dipole structures.
Claim 3
Dependent Claim
52 words
An antenna as claimed in claim 1, wherein each dipole structure of said sets of dipole structures comprises a conducting element extending from the ground plane to the respective free end, and a pair of parallel open-circuit dipoles extend from the respective free end back along respective sides of the conducting element.
Claim 4
Dependent Claim
21 words
An antenna as claimed in claim 2, wherein the conducting element is connected to the ground plane at a voltage node.
Claim 5
Dependent Claim
28 words
An antenna as claimed in claim 1, wherein the gap between the dipole structures is common to each set of said two angularly offset sets of dipole structures.
Claim 6
Dependent Claim
17 words
An antenna as claimed in claim 1, wherein the dipole structures are continuous with the ground plane.
Claim 7
Dependent Claim
30 words
An antenna as claimed in claim 1, wherein the ground plane and dipole structures are in the form of a metallic conducting layer on the surface of an insulating support.
Claim 8
Dependent Claim
12 words
An antenna as claimed in claim 6, wherein the support is planar.
Claim 9
Dependent Claim
17 words
An antenna as claimed in claim 2, wherein the dipole structures are symmetrically disposed within the space.
Claim 10
Dependent Claim
22 words
An antenna as claimed in claim 8, wherein the space, radiating elements and dipole structures are symmetrical about intended planes of polarisation.
Claim 11
Dependent Claim
56 words
An antenna as claimed in claim 1, further comprising at least one exciting means comprising a feed line extending along, but spaced from a first of dipole structures in a first set of dipole structures, across the gap and along but spaced from, a part of a second dipole structure to form an open circuit stub.
Claim 12
Dependent Claim
24 words
An antenna as claimed in claim 10, wherein the open circuit stub is tuned to be a short circuit at the intended operating frequency.
Claim 13
Dependent Claim
22 words
An antenna as claimed in claim 10, wherein the feed line is connected to at least one dipole structure by a probe.
Claim 14
Dependent Claim
82 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane, two angularly offset sets of dipole structures overlying the space, each set having an orientation and comprising a pair of aligned short-circuit elongate dipoles extending from the ground plane over the space from diametrically opposed directions to terminate in free ends adjacent but spaced from each other to define a gap between said free ends, and separate means for exciting each set, or dipole structure within a set, individually.
Claim 15
Dependent Claim
82 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane, two angularly offset sets of dipole structures overlying the space, each set having an orientation and comprising a pair of aligned short-circuit elongate dipoles extending from the ground plane over the space from diametrically opposed directions to terminate in free ends adjacent but spaced from each other to define a gap between said free ends, and separate means for exciting each set, or dipole structure within a set, individually.
Claim 16
Dependent Claim
45 words
An antenna as claimed in claim 13, further comprising a radiating element overlying the dipole structures such that the dipole structures couple, in use, with the radiating element causing it to radiate polarizations determined by the orientation of each of said sets of dipole structures.
Claim 17
Dependent Claim
22 words
An antenna as claimed in claim 14, wherein the space, radiating element and dipole structure are symmetrical about intended planes of polarization.
Claim 18
Dependent Claim
121 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane, two angularly offset sets of dipole structures penetrating into the space, each set comprising a pair of aligned dipole structures extending into the space from diametrically opposed directions and terminating in free ends, each dipole structure of said sets of dipole structures comprising a conducting element extending from the ground plane to a respective free end, and a pair of parallel open-circuit dipoles extending from the free end back along respective sides of the conducting element, the free ends being adjacent but spaced from each other to define a gap between said free ends, and separate means for exciting each set, or dipole structure within a set, individually.
Claim 19
Dependent Claim
121 words
A dual polarization antenna including a non-conducting space surrounded by a ground plane, two angularly offset sets of dipole structures penetrating into the space, each set comprising a pair of aligned dipole structures extending into the space from diametrically opposed directions and terminating in free ends, each dipole structure of said sets of dipole structures comprising a conducting element extending from the ground plane to a respective free end, and a pair of parallel open-circuit dipoles extending from the free end back along respective sides of the conducting element, the free ends being adjacent but spaced from each other to define a gap between said free ends, and separate means for exciting each set, or dipole structure within a set, individually.
Claim 20
Dependent Claim
23 words
A dual polarization antenna as claimed in claim 16, wherein the conducting elements are connected to the ground plane at a voltage node.
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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) | 2000-11-24 | 2001-05-26 | 2001-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-24 | 2005-05-26 | 2005-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-24 | 2009-05-26 | 2009-11-25 | $7700.00 | Window Closed / Lapsed |