Study of Substrate Integrated Waveguide Fed Slot Antenna for Ka Band Application

This paper presents a parametric analysis of a substrate integrated waveguide fed slot antenna for K
a
-band application. The slot’s comprehensive behavior and its resonance frequency dependence on its dimension, translational and rotational position, have been analyzed. The optimal return loss for the microstrip to SIW transition has been investigated by maximizing the tapering dimension for the K
a
-band of operation by using a commercial 3D electromagnetic CST Microwave Studio Design Suit. The slot antenna resonates at various frequencies following parametric variation. For the study, 27.74 GHz resonance points have been considered, as it comes under the 28 GHz band spectrum. For this bandwidth, the broadside gain is more than 6 dB. Radiation efficiency typically stays over 75 percent across the whole operating band. The co-polarization to cross-polarization deviation for both XZ and YZ planes is more than 40 dB at the resonance point.