US4164743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive arrangement for an instrument landing system glidepath antenna
Assignee: The University of Sydney
•
Filing: 1977-11-04
•
Granted: 1979-08-14
•
Expires: 1997-11-04
Abstract
Abstract A drive arrangement for an instrument landing system (ILS) glidepath antenna array, the drive system providing for a shorter image ground than is required by the known null reference, sideband reference or M-array systems. The drive system is applicable to an antenna array structure which is similar to an M-array structure, but the drive signals are fundamentally different from the M-array drives and the resultant field pattern does not have the "scooped portion" characteristically associated with the M-array system. A three element array structure is employed, with SBO signals driving each of the elements and CSB signals driving also two of the elements.
Inventors
- 👤 James G. Lucas
- 👤 Alan C. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:44
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/14; G01S1/18; H01Q21/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A drive arrangement for an instrument landing system antenna array having three substantially equi-spaced elements arrayed vertically above a ground plane, all three elements being arranged to be driven to radiate SBO energy and the lowermost and central element being arranged to be driven to radiate also CSB energy; the relative amplitudes and phases of the drive signals being to the centre element, CSB 1∠0°, to the lowermost element, CSB 1.7∠143°, to the uppermost and lowermost elements, SBO 1∠0°, and to the centre element, SBO 1.7∠143°, the drive magnitudes being variable by ±15% and the phase angles being variable by ±10°.
Claim 2
Dependent Claim
101 words
A drive arrangement for an instrument landing system antenna array having three substantially equi-spaced elements arrayed vertically above a ground plane, all three elements being arranged to be driven to radiate SBO energy and the lowermost and central element being arranged to be driven to radiate also CSB energy; the relative amplitudes and phases of the drive signals being to the centre element, CSB 1∠0°, to the lowermost element, CSB 1.7∠143°, to the uppermost and lowermost elements, SBO 1∠0°, and to the centre element, SBO 1.7∠143°, the drive magnitudes being variable by ±15% and the phase angles being variable by ±10°.
Claim 3
Dependent Claim
30 words
An antenna array as claimed in claim 1, wherein the lowermost element is spaced above the ground plane by a distance substantially equal to the spacing between the array elements.
References Cited (Backward Citations)
US3409890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |