Radiation Characteristics of an Offset Reflector Antenna Excited by a Combined Antenna Array

Abstract

The results of a numerical simulation of an ultrawideband hybrid antenna are presented. The antenna consists of an offset reflector and a 2×2 array of orthogonally arranged combined antennas optimized for excitation by bipolar voltage pulses of duration 0.5 ns at a center frequency of 2 GHz. The antenna is designed for use as a component of a high-power ultrawideband radiation source. The polarization characteristics of the radiation have been studied numerically for two 2-GHz modes. In the first mode, wave beams with linear orthogonal polarizations are sequentially formed. In the second mode, a wave beam with an elliptically polarized field is formed. It has been demonstrated that the radiation peak can be controlled in two mutually perpendicular directions within the width of the pattern.