In order to make a microstrip line liquid crystal phase shifter loaded with defective ground struc-ture(DGS)good in performance,small in insertion loss,suitable in return loss,and larger in phase cover-age.the DGS microstrip line liquid crystal phase shifter is modeled and simulated by utilizing HFSS simu-lation software for changing the phase shifting capability of a single phase shifting unit and changing the shape of the DGS,achieving the same performance with fewer phase shifting units.Taking a dumbbell DGS liquid crystal microstrip line phase shifter as a reference,the differences in phase shifting capability and insertion loss of five shapes of DGS(dumbbell,reduced DGS area,first-order fractal,triangular,and crossover)are compared.The first-order fractal and crossover DGS microstrip line liquid crystal phase shifters show that the phase shifting is good in capability in comparison,and finally the results are verified by simulating phase shifters with different dielectric constants to observe their S-parameters and phase shifting capability.
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