Design and RF performance analysis of microwave radiometer calibration targets

The RF characteristics in terms of reflection and coupling loss of a microwave target composed of a periodic distribution of pyramids are obtained through a Floquet, s fullwave simulation including higher order modes. The so-obtained scattering parameters are combined in a single figure-of-merit related to the emissivity behavior of the target itself. The relevance of the proposed analysis is demonstrated on a target design example operating from 14 to 220 GHz.