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A Bandpass Frequency Selective Surface Filter for Earth Observation Satellite and Radar Applications

In this paper, a bandpass frequency selective surface filter has been suggested for the satellite and radar applications at X band frequency regime. The study has been conducted both numerically and experimentally in a wide range frequency band between 2 GHz and 14 GHz. 2 GHz of 3 dB bandwidth between 7.3 GHz and 9.3 GHz has been obtained. The proposed structure has the polarization insensitive characteristic. It also has angular stability with the incident angle ranges from 0° to 60° with very small frequency deviations both TE and TM polarization modes. The prototype of the FSS structure is composed of 20x20 unit cells in a dimension of 18cm x 18 cm. The experimental studies have been conducted by using Agilent PNA-L vector network analyzer with two horn antennas. The bandpass filter can be effectively used in many satellite and radar systems as an antenna radome to prevent noises and to reject unwanted frequency bands