Investigations on the conformal capability of the substrate integrated waveguide (SIW) technique for mm-wave applications

This paper investigates the conformal capability of the substrate integrated waveguide (SIW) technique. As strong resonating structures, mm-wave filters mounted on a cylinder with different conformal radius are used to investigate the conformal capability of the SIW. As comparison, a microstrip conformal filter is investigated with simulations. Simulated results show that the SIW technique can provide excellent conformal capability for mm-wave applications. To validate the design, a 42.5 GHz five-order SIW conformal filter is designed, fabricated and mounted on a cylinder with different radius. A good agreement between the simulated and experimental results is obtained.