A Design of Small Microwave Phase Discriminator

Working principle,design methods and testing results of a small microwave phase discriminator are proposed.With microwave assembly technology,a circuit working in 5～6GHz is manufactured on Al2O3 substrate including a power divider and seven 3dB 90°hybrid couplers.Its size is only 19×19mm.The testing result indicates that this microwave phase discriminator has fine discriminability,small bulk,good productivity and stability.Several phase discriminators can constitute phase discriminated module used for instantaneous frequency measurement(IFM).