Ku-band Tunable Frequency Selective Surface Based on Liquid Crystal with Second-order Response

The design and simulation results of a Ku-band tunable frequency selective surface with second-order response is presented. The passband of proposed device is tuned through varying the dielectric constant of liquid crystal with external bias voltage. The unit-cell structure is presented as well as the simulated S-parameters. The results show that the proposed FSS exhibits a 3-dB bandwidth within 2.35%∼2.5% and a wide fractional tuning bandwidth of 15.7%. The simulated insertion loss is within 1.24∼1.92 dB.