The PS-90-2040 Opt HS15NS from PMI is a Bi-phase modulator/phase shifter that operates from 2 GHz to 4 GHz. It has a phase shift of 180 degrees controlled via TTL Logic - Logic 0 = 0 Degress, Logic 1 = 180 degrees. The device has an insertion loss less than 3 dB and a VSWR under 2.0:1. This model can handle up to 0.5 W of input power and has an On/Off speed of 15 ns. It requires a supply of +5 V or -5 V and measures 1.0 x 1.0 x 0.5 inch.