Microstrip-to-waveguide transition in planar form using a substrate integrated waveguide

Interconnection of waveguides or horn antennas to a printed circuit board (PCB) is still a challenge in modern system design. Currently, this requires high effort since the waveguide cannot easily be connected to a microstrip line or coplanar grounded waveguide. This paper introduces a new transition from microstrip to waveguide for the 24 GHz Industrial, Scientific and Medical (ISM) band, which facilitates mounting a WR-42 waveguide or horn antenna on a single substrate PCB with low manufacturing costs and hardware effort. The design, based on a new substrate integrated waveguide (SIW) to rectangular waveguide transition, as well as the simulated and measured results will be presented.