Analysis of Slotted Sectoral Waveguide Arrays With Multilayered Radomes

A method of moments/Green's function (MoM/GF) technique in the space domain is used for the rigorous and fast analysis of cylindrically conformal slotted sectoral waveguide arrays (SSWGAs) in the presence of multilayered cylindrical dielectric radomes. Representing the slots by fictitious magnetic currents via the equivalence principle, the geometry is divided into two regions and separate GF representations for each region are developed to be used in conjunction with the MoM procedure. Particularly, in the region that constitutes the cylindrically stratified medium, the newly developed closed-form GF representations for magnetic currents are valid for all source and observation points, including the source region (where source and observation points are on the top of each other). Basic performance metrics of an SSWGA such as equivalent slot currents, S-parameters, radiation patterns in the presence of a multilayered cylindrical radome are presented to assess the accuracy and efficiency of the proposed technique.