Analysis of Shielded Planar Technology for Design of Millimeter Wave Cavity Backed Slot Antenna

This paper presents a comparative study of cavity backed slot antenna design in two shielded planar technology, namely Substrate Integrated Coaxial Line (SICL) and Substrate Integrated Waveguide (SIW). Two SICL and one SIW based cavities are designed and analyzed in this work. First cavity is formed by placing two perfect electric conductor (PEC) boundaries and two perfect magnetic conductor (PMC) boundaries along the opposite edges of the Ag /2 x Ag /2 cavity. Further, a Substrate Integrated Waveguide (SIW) based cavity is formed by assigning PEC boundary along the four edges using via-holes. Two cavity backed slot antenna in the SICL and SIW based cavities are designed to operate at 28.3 GHz with a gain of 5.6 dBi and 5.7 dBi respectively. The antenna size in the SICL technology is ascertained to be compact in comparison to the SIW based design while maintaining similar performance. Thus, SICL based antenna can be employed in applications requiring miniaturized, conformal and compact antenna designs.