Electro-optical anisotropy of liquid crystal for symmetric stub phase-shifter

In this paper, the design and experimental characterization of a tunable symmetric stub phase shifter in planar technology on electro-optical anisotropy liquid crystal are presented. A reshaped symmetric stub phase shifter structure with a liquid crystal cavity has been used in order to improve the device performance, miniaturization and increase phase of microwave. The proposed design is based on the combination of dielectric symmetric stub and nematic liquid crystals layer. Based on the simulation results, optimization of the geometries are curial for varying the phase of transmitted signal. To benefit from liquid crystal anisotropy and thus obtain agility, a bias voltage is applied. The simulated results of a symmetric stub phase-shifter are compared with measured data, and good agreement is obtained.