Monolithic GaAs phase shifter circuit with low insertion loss and continuous 0-360 degrees phase shift at 20 GHz

We present here a circuit capable of continuous 0-360 degrees phase shift a t 20 GHz with only 4.2 dB of insertion loss. The phase shifter employs a va riable,velocity transmission line obtained bq periodically loading a coplan ar waveguide (CPW) line with GaAs Schottky diodes. The circuit is fabricate d on GaAs using monolithic fabrication techniques that are compatible with commercial GaAs foundry processes. To the best of our knowledge, this circu it has the lowest reported insertion loss for a monolithic solid state phas e shifter operating at 20 GHz.