US3699574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanned cylindrical array monopulse antenna
Assignee: United States Department of the Navy
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Filing: 1969-10-16
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Granted: 1972-10-17
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Expires: 1989-10-16
Abstract
Abstract A cylindrical antenna array system having two cylindrical subarrays flush mounted on a conducting cylinder, each consisting of a plurality of linear phased arrays fed through a pair of feed rings on the conducting cylinder that has a diode switch for each linear phased array coupled through a switching network to switch one-quarter to one-third of the linear phased arrays ON in a rotating manner to scan throughout 360* around the cylinder axis, and each linear phased array having a pair of rotatable dielectric slabs behind the waveguide slots thereof with all dielectric slabs mechanically coupled to rotate in synchronism to phase the radio waves for angular direction with respect to the cylinder axis, the received signals being coupled through a magic-T junction to provide sum and difference monopulse signals of targets in sight of the antenna.
Inventors
- 👤 Francis J O'hara
- 👤 Troy E Plunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24; H01Q3/242; H01Q3/26; H01Q3/30; H01Q3/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
204 words
A flush mounted cylindrical array monopulse scanning antenna comprising: a conducting cylinder with two subsystems of linear phased waveguide arrays arranged longitudinally around said cylinder to produce a flush cylindrical monopulse antenna; a waveguide feeder ring on one end of each subarray to feed radio frequency into and out of said array, said feeder ring having a crystal coupler for each linear phased array with all crystal couplers coupled to a switching network to activate one-fourth to one-third of adjacent linear phased arrays in a rotating manner to scan 360* around said cylinder axis; a pair of rotatable dielectric slabs extending through each linear phased arraY with rotation means thereon to rotate same to vary the phase angle and the scan beam over an angle with respect to said cylinder axis; master means in coupled co-operation with all said rotation means of said dielectric slabs to rotate same in synchronism; and transmitting means and receiving means coupled to said waveguide feeder rings, said receiver means having means therein to obtain sum and difference of all target signals scanned by said antenna whereby said antenna is aerodynamically constructed for high speed and capable of scanning a spherical section forward thereof to identify targets for destruction.
Claim 2
Dependent Claim
204 words
A flush mounted cylindrical array monopulse scanning antenna comprising: a conducting cylinder with two subsystems of linear phased waveguide arrays arranged longitudinally around said cylinder to produce a flush cylindrical monopulse antenna; a waveguide feeder ring on one end of each subarray to feed radio frequency into and out of said array, said feeder ring having a crystal coupler for each linear phased array with all crystal couplers coupled to a switching network to activate one-fourth to one-third of adjacent linear phased arrays in a rotating manner to scan 360* around said cylinder axis; a pair of rotatable dielectric slabs extending through each linear phased arraY with rotation means thereon to rotate same to vary the phase angle and the scan beam over an angle with respect to said cylinder axis; master means in coupled co-operation with all said rotation means of said dielectric slabs to rotate same in synchronism; and transmitting means and receiving means coupled to said waveguide feeder rings, said receiver means having means therein to obtain sum and difference of all target signals scanned by said antenna whereby said antenna is aerodynamically constructed for high speed and capable of scanning a spherical section forward thereof to identify targets for destruction.
Claim 3
Dependent Claim
51 words
A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 1 wherein said linear phased waveguide arrays each have a double row of slots with one each pair of dielectric slabs therein and one said crystal coupler for each double row of slots of the linear phased array.
Claim 4
Dependent Claim
37 words
A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 2 wherein said master means coupled in co-operation with all said rotation means of said dielectric slabs is a positive mechanical reversible driving means.
Claim 5
Dependent Claim
63 words
A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 3 wherein said receiving means includes two inputs, one coupled to each of said feeder rings, each input coupled through a first thruplexer, a phase shifter, and a second thruplexer in common to the inputs of a magic-T, the output of which provides sum and difference signals of a target.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |