This paper presents the results of a study aimed at miniaturizing a microstrip phase shifter with switched transmission lines. Two compact phase shifters were obtained-one in which the classic section of the transmission line was replaced by a low-pass filter, and the second in which the power supply filters were made on SMD elements. When comparing the theoretical and experimental characteristics of phase shifters, a discrepancy was discovered between them, which is associated with the difference in the dielectric constant of the substrates in the model and the prototype, as well as due to differences in the values of lumped elements and tolerances in the manufacture of prototypes.