Performance analysis of dual profile corrugated circular waveguide horns for radioastronomy applications

A comparative analysis of dual profile corrugated circular waveguide hems h as been carried out. It comprises the radiation pattern, horn size and phas e centre location and the variation over frequency. The analysis demonstrat es interesting effects of the exponential section length on the hom perform ance, leading to optimised electrical behaviour combined with a minimum spa ce occupation. The small variation of the phase centre with frequency looks promising in multiband applications. Results are validated by comparing E- plane and H-plane radiation diagrams with measurements.