GaAs MMICs perform in phase shifters

The present investigation is concerned with the feasiblity of a use of GaAs monolithic microwave integrated circuits (MMIC) in phase shifters. The GaAs MESFET is the building block in a GaAs MMIC. Therefore, it is quite feasible to implement MMIC phase shifters. However, not all conventional phase-shifting techniques are practical alternatives. Attention is given to a 'complex weight circuit' from E-systems, Plessey's monolithic S-band phase shifter, a high-pass/low-pass phase shifter using MESFET switches, and the use of dual-gate FETs as SPDT amplifiers. Before using any of the considered GaAs MMICs in phased-array modules, designers must weigh feasibility, cost and performance. However, accurate cost estimates are difficult at this stage of MMIC development.