A millimeter-wave GaAs 5-bit MMIC digital phase shifter

This article analyzes the phase shift principle of the monolithic digital phase shifter, and introduces the design method and the structure of each basic shift phase state, and design a 34-36 GHz 5-bit digital phase shifter. Based on the GaAs PHEMT technology, we used ADS Momentum microwave design environment to perform simulations. Finally, the main index of the 5 bit digital phase shifter are: the RMS values of the main shift phase state is less than 2.3 °; Return loss is less than - 14 dB; Insertion loss is within the range of 8.0 ~ 9.1 dB; Insertion loss fluctuations is within the range of - 0.6 ~ 0.4 dB; The chip size is 3.0 mm × 2.0 mm; Control voltage is - 5 v / 0 v. the test result shows that this design method is feasible, and points out that the design needs to be improved in various of models.