GaN MMIC RF Switches for In-Band Full-Duplex Phased Array Calibration

This paper presents three reflective-type, single-pole double-throw (SPDT) switch topologies intended for a switch feedback network in a full-duplex phased array module. The MMIC switches are implemented in a 250nm GaN on SiC process, with a design frequency range of 2.5 to 3.5 GHz. Due to the relatively low design frequency, lumped elements are used for the passive networks, and the design procedure is described. The reported switch topologies demonstrate an insertion loss below 2 dB across the desired bandwidth with varying isolation based on the topology. Measured performance is compared with simulations using foundry transistor models.