Analysis of slotted waveguide antennas on large platforms using an equivalent model

This paper proposes to analyze SWAs on large platforms using an equivalent model of the SWAs. Based on Huygens´ principle, magnetic currents, derived from the tangential electric field measured along the slot, are placed on the slot. The SWA is then equivalent to a conducting cavity with magnetic current source which can be modeled using the integral equation. The proposed method avoids the modeling of the complex structures in the waveguide. It also allows the analysis of SWAs without knowing the detailed design inside the waveguide, which is important when only limited information is provided by SWA vendors. Simulation results are presented to illustrate the effectiveness of the proposed method.