Patent US4376937A successfully refreshed from Google Patents.
US4376937A
Expired / Lapsed
US
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Antenna for primary and secondary radars
Assignee: Thales SA
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Filing: 1980-09-02
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Granted: 1983-03-15
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Expires: 2000-09-02
Abstract
Abstract A common antenna system for a primary and a secondary radar transceiver, designed for monitoring air traffic, has a primary feeder or source connected to a primary-radar transceiver and terminating in a horn confronting a reflector, this source including two transverse probes connected to a secondary-radar transceiver which also communicates with a pair of ancillary feeders flanking the horn in an azimuthal plane. The horn is also flanked by two dipoles, closer than the ancillary feeders, delivering a difference signal of a monopulse channel to an angular-deviation-measuring receiver to which an incoming sum signal of the same channel is fed from the probes by way of the secondary-radar transceiver. The signals of the monopulse channel are emitted by transponders aboard an aircraft in response to interrogation signals sent out and received back by the probes in a radiation pattern blanked for the most part by control signals transmitted and received by the ancillary feeders, these control signals leaving free an interrogation arc of limited azimuthal extent; the signals of the monopulse channel define a narrower angular-deviation-measuring arc for localizing an aircraft within the interrogation arc.
Inventors
- 👤 Georges Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:48
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/28; H01Q25/00; H01Q25/02; H01Q5/00; H01Q5/40; H01Q5/45
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
In a radar system for the monitoring of air traffic, including a primary-radar transceiver, a secondary-radar transceiver, a reflector, a primary feeder confronting said reflector and comprising in succession a rectangular waveguide connected to the primary-radar transceiver for carrying high-frequency wave energy therebetween, a matching waveguide, a circular waveguide with a cylindrical section, and a rectangular horn extending from said circular waveguide toward said reflector, two probes arranged at diametrically opposite locations in said cylindrical section, said probes having a common axis which includes an angle of not more than about 45° with the planes of the major sides of the rectangular horn, said probes being connected to the secondary-radar transceiver for exchanging interrogation signals therewith, two ancillary feeders facing said reflector in symmetrical positions on opposite sides of the rectangular horn, and a power divider inserted between the secondary-radar transceiver and said ancillary feeders for supplying same with phase-opposed control signals to be radiated toward said reflector for transmission to an aircraft along with said interrogation signals,
Claim 2
Dependent Claim
168 words
In a radar system for the monitoring of air traffic, including a primary-radar transceiver, a secondary-radar transceiver, a reflector, a primary feeder confronting said reflector and comprising in succession a rectangular waveguide connected to the primary-radar transceiver for carrying high-frequency wave energy therebetween, a matching waveguide, a circular waveguide with a cylindrical section, and a rectangular horn extending from said circular waveguide toward said reflector, two probes arranged at diametrically opposite locations in said cylindrical section, said probes having a common axis which includes an angle of not more than about 45° with the planes of the major sides of the rectangular horn, said probes being connected to the secondary-radar transceiver for exchanging interrogation signals therewith, two ancillary feeders facing said reflector in symmetrical positions on opposite sides of the rectangular horn, and a power divider inserted between the secondary-radar transceiver and said ancillary feeders for supplying same with phase-opposed control signals to be radiated toward said reflector for transmission to an aircraft along with said interrogation signals,
Claim 3
Dependent Claim
70 words
the combination therewith of a monopulse channel carrying incoming signals from transponders aboard the interrogated aircraft, said monopulse channel including a pair of auxiliary sources flanking said horn and confronting said reflector in a common azimuthal plane with said ancillary feeders, and angular-deviation-measuring means with inputs connected to said auxiliary sources and to said probes for respectively receiving therefrom a difference signal and a sum signal of said monopulse channel.
Claim 4
Dependent Claim
70 words
the combination therewith of a monopulse channel carrying incoming signals from transponders aboard the interrogated aircraft, said monopulse channel including a pair of auxiliary sources flanking said horn and confronting said reflector in a common azimuthal plane with said ancillary feeders, and angular-deviation-measuring means with inputs connected to said auxiliary sources and to said probes for respectively receiving therefrom a difference signal and a sum signal of said monopulse channel.
Claim 5
Dependent Claim
20 words
The combination defined in claim 1 wherein said auxiliary sources are disposed between said rectangular horn and said ancillary feeders.
Claim 6
Dependent Claim
19 words
The combination defined in claim 2 wherein said auxiliary sources are dipoles paralleling and closely adjoining said major sides.
Claim 7
Dependent Claim
26 words
The combination defined in claim 1, 2 or 3 wherein said angular-deviation-measuring means is connected to said auxiliary sources by way of a further power divider.
Claim 8
Dependent Claim
24 words
The combination defined in claim 1, 2 or 3 wherein said angular-deviation-measuring means is connected to said probes by way of said secondary-radar transceiver.
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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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |