Intertwined inductive frequency selective surface: An application for satellite communications

Resumen

An intertwined tri-band Inductive Frequency Selective Surface (FSS) configured as Cassegrain sub-reflector for Earth to Satellite communication is presented. The sub-reflectoris designed to provide linear polarization independency and maximum transparency to electromagnetic waves in K and Ka band at frequencies 16.4-20.4 GHz and 28.2-32.5 GHz respectively, and provide maximum reflectivity to electromagnetic waves in K band at frequencies 23.6-25.4 GHz. The sub-reflector is designed using the Jerusalem cross element along with an intertwined shape. The intertwine shape will reduce the second resonant frequency as well as given more angular stability and maximum bandwidth. The transmission and reflection parameters are shown in all frequencies of interest. Finally, the full structure will be simulated as a flat sub-reflector and placed at the front of horn antennas working at the centre of the frequency bands to compare the radiation pattern agains the classical Cassegrain and prime focus configurations. The simulation are carried out using CST Microwave Studio.