A Numerical Study on Optimal Multipole Order for Sparse Microwave Imaging of Star-Shaped Scatterers

In this paper, we extend the work on higher-order sparse two-dimensional microwave imaging using transverse magnetic polarized fields. This approach is capable of retrieving the shape of concave targets, which is particularly interesting when imaging complex targets. However, the performance of the approach is affected by the considered multipole order. Accordingly, in this communication we report a numerical study dealing with the imaging of star-shaped objects, aimed at determining which is the optimal multipole order that can be solely used to successfully image the target, depending on its electrical size.