US4101892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Localizer antenna array for use with localizer transmitters operating at one carrier frequency
Assignee: Individual
•
Filing: 1975-11-19
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Granted: 1978-07-18
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Expires: 1995-11-19
Abstract
Abstract A broadband localizer antenna array with an even number of elements is supplied by a backmatched power dividing network comprising two chains of directional couplers and a group of hybrids which divide the power among the elements in accordance with geometrical progessions. The center elements in the array may be spaced 0.6 wavelength apart at the average frequency. Other spacings between the elements are greater than 0.6 wavelength.
Inventors
- 👤 Andrew Alford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:52
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/14; G01S1/16; H; H01; H01Q; H01Q25/00; H01Q25/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
59 words
A localizer antenna array comprising: (a) an even number of antenna elements, (b) a transmitter of the carrier and sidebands, (c) power supplied by said transmitter to a group of power dividers, (d) a group of hybrids fed by said power dividers distributing the carrier and sidebands power among the antenna elements substantially in accordance with a geometrical progression.
Claim 2
Dependent Claim
59 words
A localizer antenna array comprising: (a) an even number of antenna elements, (b) a transmitter of the carrier and sidebands, (c) power supplied by said transmitter to a group of power dividers, (d) a group of hybrids fed by said power dividers distributing the carrier and sidebands power among the antenna elements substantially in accordance with a geometrical progression.
Claim 3
Dependent Claim
37 words
A localizer array as in claim 1 wherein the center antenna elements are spaced 0.6 wavelengths apart at the average wavelength in the localizer band and other elements are separated more than 0.6 wavelength from each other.
Claim 4
Dependent Claim
21 words
A localizer array as in claim 1 wherein the power division deviates less than ± 11/2 dB from the geometric progression.
Claim 5
Dependent Claim
69 words
A localizer array comprising: (a) an even number of antenna elements, (b) a transmitter of the sidebands only without carrier, (c) power supplied by said transmitter to power dividers, (d) a group of hybrids fed by said power dividers distributing the sidebands only power to antenna elements substantially in accordance with a geometrical progression among the antenna elements starting beyond the first two from the center of the array.
Claim 6
Dependent Claim
69 words
A localizer array comprising: (a) an even number of antenna elements, (b) a transmitter of the sidebands only without carrier, (c) power supplied by said transmitter to power dividers, (d) a group of hybrids fed by said power dividers distributing the sidebands only power to antenna elements substantially in accordance with a geometrical progression among the antenna elements starting beyond the first two from the center of the array.
Claim 7
Dependent Claim
19 words
A localizer array in accordance with claim 4 wherein the two central elements are spaced substantially 0.6 wavelengths apart.
Claim 8
Dependent Claim
29 words
A localizer array in accordance with claim 5 wherein the elements other than the central elements are spaced 0.75 wavelength apart at the average wavelength within the localizer band.
Claim 9
Dependent Claim
17 words
A localizer array in accordance with claim 1 wherein the number of elements is greater than four.
Claim 10
Dependent Claim
15 words
A localizer array in accordance with claim 1 wherein the power dividers are directional couplers.
Claim 11
Dependent Claim
50 words
A localizer array in accordance with claim 1 wherein a second set of power dividers in combination with the hybrids distribute the sidebands only power to antenna elements substantially in accordance with a geometrical progression among the antenna elements starting beyond the first two from the center of the array.
Claim 12
Dependent Claim
14 words
A localizer array as in claim 4 wherein the power dividers are directional couplers.
Claim 13
Dependent Claim
21 words
A localizer array as in claim 4 wherein the power division deviates less than ± 11/2 dB from the geometric progression.
Claim 14
Dependent Claim
21 words
A localizer array as in claim 9 wherein the power division deviates less than ± 11/2 dB from the geometric progression.
References Cited (Backward Citations)
US3711857A
Cited
US3866228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |