Abstract
ABSTRACT In this paper, an accurate numerical modelling of nematic liquid crystal for the inverted microstrip phase shifter is presented. Four kinds of liquid crystal with different values of anisotropy have been studied using the conventional simplified liquid crystal model where the liquid crystal is usually assumed isotropic and homogeneous. The S parameters of the phase shifter based on these liquid crystals are simulated. Moreover, considering the anisotropy and inhomogeneous of liquid crystal, the accurate modelling of nematic liquid crystal BL006 applied in the phase shifter under the voltage is calculated. The distribution of the director and permittivity of liquid crystal at the steady state under different voltages is obtained. Based on the accurate modelling results of liquid crystal BL006, the phase shifter is remodelled and simulated. Compared with that of the simplified model, the maximum differential phase shift of the phase shifter based on the liquid crystal BL006 in the accurate model at the centre frequency of 20 GHz was reduced by about , and this error will increase with the increasing of the frequency. This numerical modelling method of liquid crystal also can be used in the design of other microwave devices based on nematic liquid crystal.
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