Phase-Only Nulling with Coarsely Quantized Phase Shifters in Non-Principal Plane Pattern Cuts.

The purpose of this report is to show that deep nulls can be imposed at specified locations in pattern cuts parallel to the principal plane cuts of planar array patterns using phase-only control of coarsely quantized phase shifters. This is done by using the number of phase shifters available for control in the columns of the array to compensate for the small number of bits of the individual phase shifters. A null synthesis algorithm is derived to calculate the phase shifts to impose nulls in the nu nu1 pattern cut of planar array antenna patterns by matching the pattern of a linear array with nulls imposed at the same locations using continuously variable, combined phase and amplitude control. Results of calculations are presented. Keywords Planar array antennas, Phase quantization, Phase only weight control, Null synthesis, Antenna radiation patterns. jhd