Honeycomb substrate integrated waveguide (HCSIW) and its application to design of SIW right-angle corner

This paper suggests a substrate integrated waveguide in honeycomb structure consisting of a number of small holes (air-filled posts) drilled vertically and entirely through both plating-conductor layers of the substrate (HCSIW), and shows a design method of an SIW right-angle corner as an example of its applications. First, the propagation constant of an HCSIW is derived from the simulation results of a commercial em-simulator (HFSS), and then its effective dielectric constant (ε_r^eff) and transmission loss are discussed. It is shown that the ε_r^eff is approximately determined from the ratio of all the cross-section area of the air-filled posts to the remainder dielectric one, and the transmission loss is comparable with that of a common SIW. Next, the SIW right-angle corner is designed by arranging appropriately honeycomb structure. Experimental verification for the designed right-angle corner is also shown.