Surrogate-model based isolation analysis of slotted waveguide antennas

This paper addresses the issue of isolation analysis of slotted waveguide antennas (SWAs) when their detailed structures are unavailable. A surrogate model, built from information about radiation patterns, was usually employed for this purpose. It reproduced far/near fields of the original antenna, but failed to provide port and phase information which was essential to the isolation calculation. This work fills the above gap by exploiting the reaction theorem with certain approximations. The proposed method enables the isolation analysis in the absence of detailed information of SWA, which is useful especially for antennas bought off-the-shelf. Moreover, it obviates the need for modeling the complex structure of SWA, so as to reduce the computational time and memory usage. Numerical validation illustrates the effectiveness of the proposed method.