Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1995-05-11
1996-05-07
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, 342157, H01Q 300
Patent
active
055150608
ABSTRACT:
An active array antenna for use, for example, in a radar system, includes elemental antennas, each with a T/R module, distributed over a circular aperture. For lowest cost, the aperture is thinned. The T/R modules are operated at maximum output, to achieve maximum DC-to-RF efficiency, and for simplicity. A phase controller controls the phase shift which is imparted by each module to its signal, to form a main beam and its associated sidelobes. A perturbation phase generator portion of a phase controller adds a perturbation phase shift selected, in conjunction with a particular thinning distribution, to form a relatively wide null in the sidelobe structure, in which signal transduction is reduced. In a radar context, this null may be placed on a source of ground clutter or a jammer.
REFERENCES:
patent: 5115243 (1992-05-01), Perry et al.
patent: 5233356 (1993-08-01), Lee et al.
"Phase Array Antenna Handbook", Mailloux, R. I., Artech House, Boston, 1993.
"Design of Circular Aperture for Narrow Beam Width and Low Sidelobes", Taylor, T. T., IRE Transactions on Antenna and Propagation, 1/60, pp. 17-22.
"Adaptive Sidelobe Nulling Using Digitally Controlled Phase Shifter" Baird, C. A. & Rassweiler, G. G., IEEE Trans. 1976 AP-24, pp. 638-649.
"Simple Method for Phase Nulling by Phase Perturbation", Steyskal, H., IEEE Trans., 1983, AP-31, pp. 163-166.
"General Radiation-Pattern Synthesis Technique for Array Antenna of Arbitrary Configuration and Element Type", IEEE Proceedings, vol. 135, Pt.H. No. 4, 1988, pp. 241-248.
Bae Koeunyi
Hussain Moayyed A.
Yu Kai-Bor
Blum Theodore M.
Martin Marietta Corp.
Meise William H.
Nieves Carlos A.
Young Stephen A.
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