A double waveguide frequency bands waveguide-to-microstrip transition

In this paper, a novel wideband waveguide-to-microstrip transition is proposed and designed, which transforms a waveguide port to a microstrip port via a substrate integrated waveguide (SIW) transformer. The operation frequency covers the full frequency bands of the WR-51 waveguide and the WR-43 waveguide from 14.5 GHz to 26.7 GHz. The simulation results show that the insertion loss is less than 0.2 dB and the return loss is better than 16 dB. Another main feature is the novel configuration, where the SIW and the metal attachment separate the waveguide cavity and the microstrip circuits. Therefore, this transition is suitable for the hermetic sealing. The high performance and compact structure are most suitable for military and space applications.