Concept of substrate integrated E-plane waveguide and waveguide filter

A novel substrate integrated E-plane waveguide is proposed. It is used to implement E-plane type of waveguide circuits on printed circuit boards which cannot be accomplished by the conventional substrate integrated waveguide. The new waveguide structure has two copper strips at the middle layer of the substrate. The strips follow the directions of the plated through holes that emulate the vertical wall of a conventional rectangular waveguide. Each strip provides a path for the longitudinal current along the vertical waveguide wall. Simulation is carried out to demonstrate that the proposed waveguide is able to guide horizontally polarized electromagnetic wave. As an example, an E-plane waveguide filter is designed based on the new waveguide structure.