Reconfigurable Phased Array Antenna Based on Liquid Crystal With Miniaturized Bandpass Filter

In this paper, a single side patterned miniaturized bandpass filter (0.02$\lambda$ox0.23$\lambda$0) is applied with 1 x4 reconfigurable phased array antenna systems using liquid crystal (LC). The simulations show that the bandwidth meets 11.30 GHz under $\mathrm{S}_{11}\lt _{-}$10dB, beam steering angle achieved 36°, and realized gain of main lobe >3.20dBi. Also, the transmission loss from biasing port to RF port satisfied $\lt _{-}$70dB from 1 kHz to 10 kHz, therefore, it operates bias blocking well.