Circularly Polarized C-Band Lens-Horn Antenna for Radar Remote Sensing Calibration

In this paper the design and optimization process of a radar remote sensing calibration antenna is presented. The solution consists in a septum polarizer and a high gain Potter horn with exceptionally low axial ratio (0.2 dB) and low SLL at 5.3 GHz. To obtain a compact design, a dielectric lens has been designed to correct the horn phase error and reduce the final length. As the lens degrades the return loss, impedance matching transformers are designed and simulated in order to fulfill the system specifications. Finally measurements of the septum polarizer are shown and discussed.