A new substrate integrated waveguide phase shifter

This paper presents a new phase shifter based on substrate integrated waveguide (SIW) technique. Phase shifting is achieved by changing the diameter and the position of metallic inductive posts inserted in the SIW substrate. Using a two-post configuration, simulations have been carried out for different diameters and positions which have shown a good agreement with the theory. To prove the concept, prototypes have been fabricated and measured. Preliminary experimental results show clearly that the use of inductive posts alters the phase of the wave traveling in the SIW substrate.