US3731316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butler submatrix feed for a linear array
Assignee: United States Department of the Navy
•
Filing: 1972-04-25
•
Granted: 1973-05-01
•
Expires: 1992-04-25
Abstract
Abstract Several small Butler matrices are interconnected in a manner to replace a large single Butler matrix employed in a beam forming and scanning network for a linear array. This system of Butler submatrices (a set of low order Butler matrices simulating a single higher order Butler matrix) permits reduction in the size of existing feeding systems, which results in a substantial savings of system components and hardware. The function of this submatrix feed system is substantially identical to that of the single multibeam matrix network in most respects except for a fewer number of available beams. Also, this submatrix feed system is capable of exciting linear arrays which cannot presently be excited by a single Butler matrix. Also, the system has application in satellite communications and direction finding equipment.
Inventors
- 👤 B Sheleg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
In a beam forming and scanning network for a linear array of antennas, each antenna being connected to an output of multibeam network means, a plurality of the input means of said multibeam means being serially coupled to fixed phase shifters and power dividers, the improvement comprising: a plurality of discrete Butler matrices employed as said multibeam network means between the antennas and fixed phase shifters.
Claim 2
Dependent Claim
66 words
In a beam forming and scanning network for a linear array of antennas, each antenna being connected to an output of multibeam network means, a plurality of the input means of said multibeam means being serially coupled to fixed phase shifters and power dividers, the improvement comprising: a plurality of discrete Butler matrices employed as said multibeam network means between the antennas and fixed phase shifters.
Claim 3
Dependent Claim
82 words
In a beam forming and scanning network for a linear array of N antennas, each antenna being connected to an output terminal of multibeam network means, a plurality of input beam terminal means of said multibeam network means being serially coupled to fixed phase shifters and power dividers, the improvement comprising: B number of (C X C) order discrete Butler submatrices having C number of outputs employed as said multibeam network means between the antennas and fixed phase shifters wherein B.N N.
Claim 4
Dependent Claim
82 words
In a beam forming and scanning network for a linear array of N antennas, each antenna being connected to an output terminal of multibeam network means, a plurality of input beam terminal means of said multibeam network means being serially coupled to fixed phase shifters and power dividers, the improvement comprising: B number of (C X C) order discrete Butler submatrices having C number of outputs employed as said multibeam network means between the antennas and fixed phase shifters wherein B.N N.
Claim 5
Dependent Claim
92 words
The device as claimed in claim 2 wherein the first terminal of each submatrix is sequentially connected across the linear array until the first terminal of submatrix B is connected to terminal B of the array and, the B + 1 element of the array is connected to the second terminal of the first submatrix and; the second terminal of each subsequent submatrix is sequentially connected until the second terminal of submatrix is connected to array element 2B; and until the C terminal of submatrix B is connected to array element N.
Claim 6
Dependent Claim
41 words
The device as claimed in claim 2 wherein the fixed phase shifter comprises: B-1 sets of prescribed line lengths for establishing a phase: where k is the particular beam terminal of said multibeam means, and SMn is the particular submatrix means.
Claim 7
Dependent Claim
11 words
The device as claimed in claim 2 wherein: B equals 2.
References Cited (Backward Citations)
US3295134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |