Recent work on (Sub-)Mm-wave ultra wideband corrugated horns for radio astronomy

Corrugated horns are widely used in many applications, including radio astronomy, because of their high performance over large bandwidths. However, the always increasing demand for wider frequency coverage cannot be met by traditional conical corrugated horns with typical fabrication constraints at (sub-)mm wavelengths. The usual way to overcome this limitation is to use profiled corrugated horns, such as the 275-500 GHz horn presented in this paper. As an alternative, we propose and demonstrate that conical corrugated horns can achieve ultra-wideband (UWB) performance by changing the depth of corrugations along the horn. A design for the 67-116 GHz band is presented. Fabrication of these two designs is on-going and measurements will be presented at the conference.