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US3979754A
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Radio frequency array antenna employing stacked parallel plate lenses
Assignee: Raytheon Co
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Filing: 1975-04-11
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Granted: 1976-09-07
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Expires: 1995-04-11
Abstract
Abstract A radio frequency multibeam array antenna is disclosed wherein a beam forming network includes a first set of vertically disposed parallel plate lenses coupled between a matrix of radiating elements and a second set of horizontally disposed parallel plate lenses. With such a beam forming network a plurality of narrow pencil-shaped beams of radiation may be formed over a relatively large solid angle.
Inventors
- 👤 Donald H. Archer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:27
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q25/00; H01Q25/007; H01Q25/008; H01Q25/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
318 words
An antenna array in a monopulse radar for forming, simultaneously, a desired set of overlapping directional beams, each one of such beams having a substantially circular cross section, such array comprising: a. a first set of parallel plate radio frequency lenses, each one of such lenses including a first plurality of feedports and a second plurality of output ports, each one of such feedports in each one of such parallel plate radio frequency lenses being coupled through a different electrical path to all of the output ports in the corresponding lens, the lengths of the different electrical paths from each one of the feedports to the output ports being selected to form a first set of overlapping energy distributions corresponding in number to the desired set of directional beams; b. a second set of parallel plate radio frequency lenses, the number of such lenses in such second set being equal to the number of output ports in each one of the parallel plate lenses in the first set thereof, each one of the parallel plate radio frequency lenses in such second set having a third plurality of input ports equal in number to the number of parallel plate radio frequency lenses in the first set and a fourth plurality of output ports, each one of the third and fourth plurality of input and output ports being coupled through a different electrical path to form a second set of overlapping energy distributions corresponding in number to the desired set of directional beams; c. means for interconnecting, through predetermined length paths, one of the output ports in the first set of parallel plate radio frequency lenses to a corresponding one of the input ports in the second set of parallel plate radio frequency lenses; and d. means for connecting each one of the output ports in the second set of parallel plate radio frequency lenses to a different antenna element.
Claim 2
Dependent Claim
318 words
An antenna array in a monopulse radar for forming, simultaneously, a desired set of overlapping directional beams, each one of such beams having a substantially circular cross section, such array comprising: a. a first set of parallel plate radio frequency lenses, each one of such lenses including a first plurality of feedports and a second plurality of output ports, each one of such feedports in each one of such parallel plate radio frequency lenses being coupled through a different electrical path to all of the output ports in the corresponding lens, the lengths of the different electrical paths from each one of the feedports to the output ports being selected to form a first set of overlapping energy distributions corresponding in number to the desired set of directional beams; b. a second set of parallel plate radio frequency lenses, the number of such lenses in such second set being equal to the number of output ports in each one of the parallel plate lenses in the first set thereof, each one of the parallel plate radio frequency lenses in such second set having a third plurality of input ports equal in number to the number of parallel plate radio frequency lenses in the first set and a fourth plurality of output ports, each one of the third and fourth plurality of input and output ports being coupled through a different electrical path to form a second set of overlapping energy distributions corresponding in number to the desired set of directional beams; c. means for interconnecting, through predetermined length paths, one of the output ports in the first set of parallel plate radio frequency lenses to a corresponding one of the input ports in the second set of parallel plate radio frequency lenses; and d. means for connecting each one of the output ports in the second set of parallel plate radio frequency lenses to a different antenna element.
Claim 3
Dependent Claim
166 words
An array antenna system comprising: a. a first set of radio frequency lenses having a plurality of output ports coupled to a like plurality of antenna elements, each one of such lenses having a like plurality of input ports; b. a second set of radio frequency lenses, each one of such lenses having a plurality of input ports and a plurality of output ports, the number of output ports of each one of the lenses being equal to the lenses in the first set, the number of lenses in the second set being equal to the number of input ports of one of the lenses in the first set; c. means for coupling the input ports of each one of the lenses in the first set to different ones of the lenses in the second set; d. a monopulse arithmetic unit; and e. switching means for coupling the monopulse arithmetic unit to selected ones of the input ports of the second set of radio frequency lenses.
Claim 4
Dependent Claim
166 words
An array antenna system comprising: a. a first set of radio frequency lenses having a plurality of output ports coupled to a like plurality of antenna elements, each one of such lenses having a like plurality of input ports; b. a second set of radio frequency lenses, each one of such lenses having a plurality of input ports and a plurality of output ports, the number of output ports of each one of the lenses being equal to the lenses in the first set, the number of lenses in the second set being equal to the number of input ports of one of the lenses in the first set; c. means for coupling the input ports of each one of the lenses in the first set to different ones of the lenses in the second set; d. a monopulse arithmetic unit; and e. switching means for coupling the monopulse arithmetic unit to selected ones of the input ports of the second set of radio frequency lenses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |