US3594811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sum and difference antenna
Assignee: Thales SA
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Filing: 1969-02-07
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Granted: 1971-07-20
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Expires: 1989-02-07
Abstract
Abstract The radiation elements of an antenna comprising a linear array of elements and a further compensation element are fed so that the radiation pattern of a central portion of the linear array is in quadrature of phase with the radiation pattern of the remaining elements of the array, for the formation of a nondirective pattern covering the secondary lobes of the directive pattern obtained through an in-phase feeding of the elements of the linear array.
Inventors
- 👤 Robert L Pierrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
278 words
An antenna system alternately having a directive radiation pattern and a nondirective radiation pattern, said system comprising a linear of radiating elements located symmetrically with respect to a symmetry plane, and a further element in said plane, said further element being located outside said linear array; said array comprising a central group of K elements, including two symmetrical subgroups of K/2 elements if k is even and two symmetrical subgroups of (K-1/2) 2elements if K is odd, and two symmetrical groups of p elements on both sides of said central group, K and p being integers, said system further comprising feeding means for alternately (i), for forming the directive radiation pattern: feeding in phase at least the 2p elements of said two symmetrical groups and (ii), for forming said nondirective radiation pattern, simultaneously: feeding in phase a first lateral group of n consecutive elements, located on one side of the central group of elements, n being an integer smaller than p+1; feeding in phase, but in phase opposition to said first lateral group, a second lateral group of n elements symmetrical with said first lateral group with respect to said central group; feeding, in phase quadrature with reSpect to said lateral groups, said further element; and feeding said central group in phase with either one of said lateral groups if K is odd, and the elements of said two symmetrical subgroups in phase opposition relatively to each other and in phase quadrature with respect to the elements of the lateral groups if K is even, thereby obtaining a radiation pattern in quadrature of phase with that resulting from the feeding in phase opposition of said two lateral groups.
Claim 2
Dependent Claim
278 words
An antenna system alternately having a directive radiation pattern and a nondirective radiation pattern, said system comprising a linear of radiating elements located symmetrically with respect to a symmetry plane, and a further element in said plane, said further element being located outside said linear array; said array comprising a central group of K elements, including two symmetrical subgroups of K/2 elements if k is even and two symmetrical subgroups of (K-1/2) 2elements if K is odd, and two symmetrical groups of p elements on both sides of said central group, K and p being integers, said system further comprising feeding means for alternately (i), for forming the directive radiation pattern: feeding in phase at least the 2p elements of said two symmetrical groups and (ii), for forming said nondirective radiation pattern, simultaneously: feeding in phase a first lateral group of n consecutive elements, located on one side of the central group of elements, n being an integer smaller than p+1; feeding in phase, but in phase opposition to said first lateral group, a second lateral group of n elements symmetrical with said first lateral group with respect to said central group; feeding, in phase quadrature with reSpect to said lateral groups, said further element; and feeding said central group in phase with either one of said lateral groups if K is odd, and the elements of said two symmetrical subgroups in phase opposition relatively to each other and in phase quadrature with respect to the elements of the lateral groups if K is even, thereby obtaining a radiation pattern in quadrature of phase with that resulting from the feeding in phase opposition of said two lateral groups.
Claim 3
Dependent Claim
234 words
An antenna system according to claim 1, wherein, said central group comprising an odd number of elements, said feeding means comprise: a power means having an output; switching means having an input coupled to said power means output, and a first and a second output; a first power distributor having an input coupled to said first output of said switching means and a first and a second in-phase outputs; a second power distributor having an input coupled to said second output of said switching means and a first output coupled to said central group, a second output, and a third output coupled to said further element, the energy at said third output being shifted by pi /2 with respect to that at said first and second outputs of said second distributor; a first hybrid junction having a ''''Difference'''' channel coupled to said second output of said second distributor, a ''''Sum'''' channel coupled to said first output of said first distributor, and two further channels respectively coupled to said first and second groups of p elements and a second hybrid junction having a Difference channel coupled to a matched load, a Sum channel coupled to said second output of said first distributor, and two further channels respectively coupled to the two groups of consecutive (p-n) elements located symmetrically with respect to the central group and not including the elements of said groups of n channels.
Claim 4
Dependent Claim
266 words
An antenna system according to claim 1, wherein, K being even, said feeding means comprise: a power means having an output switching means having an input coupled to said power means output, and a first and a second output; a first power distributor having an input coupled to said first output of said switching means, a first, a second and a third in-phase outputs; a second power distributor having an input coupled to said second output of said switching means, a first output, a second output coupled to said further element and a third output, the energy at said last mentioned first output being in quadrature of phase with respect to that at said last mentioned second and third outputs; a first hybrid junction having a ''''Difference'''' channel coupled to said first output of said second distributor, a ''''Sum'''' channel coupled to said first output of said first distributor and two further channels respectively coupled to said first and second group of n elements; a second hybrid junction having a difference channel coupled to a matched load; a Sum channel coupled to said second output of said first distributor, and two further channels respectively coupled to the two groups of consecutive (p-n) elements located symmetrically with respect to the central group and not including the elements of said lateral groups of n elements; and a third hybrid junction having a Difference channel coupled to said second output of said third distributor, a Sum channel coupled to said third output of said first distributor and two further channels coupled to the elements of said two subgroups respectively.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |