Accession Number : ADA133128

Title :   Phase-Only Nulling at Symmetric Pattern Locations,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY

Personal Author(s) : Shore,Robert A

PDF Url : ADA133128

Report Date : Apr 1983

Pagination or Media Count : 42

Abstract : Nulls cannot be imposed in ideal linear array antenna patterns with phase-only weight control at locations symmetric with respect to the main beam if the phase perturbations are restricted to be small. If, however, no restriction is placed on the magnitude of the phase perturbations, then phase-only nulling at symmetric pattern locations is possible. Several examples are presented to illustrate symmetric nulling with phase-only control. The phase perturbations are calculated by a nonlinear programming computer algorithm. The cancellation patterns tend to be interferometric in shape and result in significant distortion over much of the pattern. (Author)

Descriptors :   *Nulls(Amplitude), *Antenna arrays, *Linear arrays, *Phase control, *Nonlinear programming, Algorithms, Computations, Perturbations, Distortion, Cancellation, Symmetry, Chebyshev approximations

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE