Prelaunch performance of the 118 GHz polarcube 3utemperature sounding radiometer

Design, analysis and pre-launch performance of the PolarCube 3U CubeSat 118.75 GHz radiometer payload is presented. Procedures used to determine optimum feed horn/reflector dimensions, phase center and antenna efficiencies based on a full wave Fourier analysis are outlined. A brief description of the design and functionality of the eight channel intermediate frequency board is also provided. Images obtained by the instrument during recent airborne tests over the Antarctic using an aluminium 3D printed corrugated feed indicate a well focused scanning reflector antenna system with high main beam efficiency and good separation between the radiometer channels.