Substrate Integrated Waveguide Power handling Capability at Millimeter Wave with Surface Roughness Consideration

Abstract

Abstract-This study investigates the power handling capability of the substrate integrated waveguide (SIW) transmission lines in millimeter-wave frequencies. The average power handling capability (APHC) which refers to self-heating is considered. The ohmic and dielectric losses expressions are used to predict the APHC as a function of the geometrical parameters and used material. In fact, small dimensions and the increased losses at millimeter-waves dramatically reduce the power handling capability. Moreover, the additional effect of the surface roughness doubles the conductor loss at millimeter-wave frequencies. The proper material and dimensions selection for SIW, which could increase its APHC are discussed. In addition, guidelines for investigating the oversized version of SIW are also presented. To investigating the oversized version of SIW are also presented. To validate the simulations, a set of transmission lines (microstrip, The good agreement of measured losses with the calculated validates this study.