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A Balanced Feed Quad-Ridged Horn Antenna

This paper presents an optimized balanced feed quad-ridged horn antenna. The two SMA probes are inserted into two symmetric ridges, and the inner conductors of the coaxial probes are connected on the horn's symmetric center. A balanced feeding network consists of a power divider and two analog or digital phase shifters is introduced. By adjusting the phase of the phase shifter, the phase offset caused by structural asymmetry can be calibrated. Symmetrical radiation pattern and low cross polarization is achieved from 2 to 6 GHz in full wave simulation. This antenna is used as the feed antenna of Compact Antenna Test Range (CATR) or satellite reflector antenna.