Broadband phase shifter using air holes in substrate integrated waveguide

Summary form only given, as follows. This paper presents a novel configuration of a broadband phase shifter designed in Substrate Integrated Waveguide (SIW). The phase shift mechanism is based on the synthesis of a low-dielectric slab using an array of air holes, in the middle of the SIW. A simple design technique is proposed where unit cells are simply cascaded. Two different phase shifters are designed and simulated. Finally, an experimental validation at Ka band (26.5 to 40 GHz) is presented for both circuits.