A Novel RF Hilbert Transformer Single Sideband Mixer

In this paper, a novel single sideband (SSB) mixer is presented. Different from conventional SSB mixer topology, the proposed SSB mixer is designed from RF Hilbert transformer. The upconverted signal from single balanced mixer is divided into two paths, and one is transformed by RF Hilbert transformer. The other path signal experiences simple phase delay, and the recombined two signal cancel out one of the sideband signals. This new SSB mixer topology applies only one single balanced mixer and resolves the size issue of low frequency coupler in conventional topology. To demonstrate proposed topology, a prototype SSB mixer is designed and fabricated. The simulation and experiment results align well with theoretical prediction.