Investigation into phase quantization effects of synthesized array factor having a main beam and a prescribed null using a Dolph-Chebyshev array

Investigations into the phase quantization effects for a 16-element Dolph-Chebyshev linear array with half-wavelength element spacing and digital phase shifters are reported in this article for an array factor having a main beam and a prescribed null. The main beam is fixed, and the prescribed null angular position varies between 1 and 60°. Based on results with perfect phase, the effects of phase quantization on the radiation characteristics are studied. Particularly, one can notice that the main beam angular position and half-power beamwidth errors are negligible. However, phase quantization greatly affects the prescribed null position and depth, proportionally to the sidelobe ratio.