A simple dual-band corrugated horn with low cross polarization

A simplified design for dual-band corrugated conical horns with low cross-polarization characteristics is discussed. Measured results of the breadboard horn show that cross-polar levels of better than -34 dB and return loss of better than 28 dB have been realized over the designed frequency bands. It is shown that the performance of the single-depth corrugated horn can be optimized to give low cross-polarization fields over a 40% frequency bandwidth. Cross-polar levels on the order of -34 dB and return loss of better than 28 dB have been realized for the breadboard horn. The designed horn has potential application in direct-broadcast satellite antennas operating in the 12 and 17.5 GHz frequencies