US3839720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corporate feed system for cylindrical antenna array
Assignee: United States Department of the Navy
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Filing: 1973-06-25
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Granted: 1974-10-01
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Expires: 1993-06-25
Abstract
Abstract A reciprocal corporate microwave feed network. A matrix is connected between a selector switch and an antenna ring array. The matrix divides microwave energy from sender apparatus and produces a tapered phase distribution to a selectively predetermined sector of the array. The active or energized array sector forms a highly directive beam which is normal to the array sector. The matrix is circularly symmetric and can feed any sector of the array as selected by an input switch. The beam is step scanned over 360*, with the number of steps being determined by switching and matrix circuitry.
Inventors
- 👤 J Reindel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24; H01Q3/242; H01Q25/00; H01Q25/02; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
285 words
A microwave energy feed system for a cylindrical phased-array antenna array comprising: a plurality of radiating elements equi-spaced and positioned about a ring of said array; reciprocal, microwave energy sending apparatus; switch means connected at its input to the output of said sender means; cylindrical and symmetrical, microwave energy feed matrix means having an equal number of input ports and output ports, and comprising two or more concentric and symmetrical rows of directional couplers connected at the input to said output ports of said switch means and further being connected, with respect to each other in a periodic, closed end-to-end manner by means of transmission lines and further including phase shifters connected between said directional couplers and said transmission lines such that the phases of the center radiating elements of said sector are retarded symmetrically; said switch means having a like number of output ports, a different one of which is connected to one of said input ports of said matrix means by means of an equal-lenght transmission line for coupling energy from said sending means to selectively predetermined ones of said input ports of said matrix to provide at the corresponding output ports thereof a tapered phase distribution; each of said output ports of said matrix means being connected by means of an equal-length transmission line with respect to each other, to a different one of said radiating elements, whereby said tapered phase distribution can be fed to a selectively predetermined sector of said ring to produce a cophasal wave which is tangential with respect to said sector and to form a beam which is normal with respect to said dector; and, said switch means further comprising means for step-scanning said beam over 360*.
Claim 2
Dependent Claim
285 words
A microwave energy feed system for a cylindrical phased-array antenna array comprising: a plurality of radiating elements equi-spaced and positioned about a ring of said array; reciprocal, microwave energy sending apparatus; switch means connected at its input to the output of said sender means; cylindrical and symmetrical, microwave energy feed matrix means having an equal number of input ports and output ports, and comprising two or more concentric and symmetrical rows of directional couplers connected at the input to said output ports of said switch means and further being connected, with respect to each other in a periodic, closed end-to-end manner by means of transmission lines and further including phase shifters connected between said directional couplers and said transmission lines such that the phases of the center radiating elements of said sector are retarded symmetrically; said switch means having a like number of output ports, a different one of which is connected to one of said input ports of said matrix means by means of an equal-lenght transmission line for coupling energy from said sending means to selectively predetermined ones of said input ports of said matrix to provide at the corresponding output ports thereof a tapered phase distribution; each of said output ports of said matrix means being connected by means of an equal-length transmission line with respect to each other, to a different one of said radiating elements, whereby said tapered phase distribution can be fed to a selectively predetermined sector of said ring to produce a cophasal wave which is tangential with respect to said sector and to form a beam which is normal with respect to said dector; and, said switch means further comprising means for step-scanning said beam over 360*.
Claim 3
Dependent Claim
168 words
Microwave beam-forming apparatus for a phased-array antenna system and comprising a plurality of radiating elements equi-spaced and positioned about a ring of said array; reciprocal, corporate matrix means having an equal number of input ports and output ports connected between microwave energy sending means and said antenna system for dividing said energy to provide a tapered phase distribution to a selectively predetermined sector of said phased array and including a plurality of symmetrical and parallel disposed rows of directional couplers, each of said couplers in said rows being connected by means of transmission line to a selectively predetermined coupler in an adjacent row, whereby said rows are connected to each other in a repetitive, closed, end-to-end manner, one of said rows being selectively connected at the inputs of said couplers to said energy sending means and another one of said rows being connected at the outputs of said couplers to said phased array, and said matrix further including phase shifters connected between said couplers connected to each other.
Claim 4
Dependent Claim
168 words
Microwave beam-forming apparatus for a phased-array antenna system and comprising a plurality of radiating elements equi-spaced and positioned about a ring of said array; reciprocal, corporate matrix means having an equal number of input ports and output ports connected between microwave energy sending means and said antenna system for dividing said energy to provide a tapered phase distribution to a selectively predetermined sector of said phased array and including a plurality of symmetrical and parallel disposed rows of directional couplers, each of said couplers in said rows being connected by means of transmission line to a selectively predetermined coupler in an adjacent row, whereby said rows are connected to each other in a repetitive, closed, end-to-end manner, one of said rows being selectively connected at the inputs of said couplers to said energy sending means and another one of said rows being connected at the outputs of said couplers to said phased array, and said matrix further including phase shifters connected between said couplers connected to each other.
Claim 5
Dependent Claim
32 words
The apparatus of claim 2 further inclUding switch means connected between said energy sending means and said matrix means for coupling energy to selectively predetermined ones of said inputs of said couplers.
References Cited (Backward Citations)
US2466354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |