High frequency modeling of large composite scatterers of arbitrary shape: Vortex-lens validation

This paper describes a high frequency method that can be used to compute the scattered field produced by electrically large composite (multi-layered) scatterers having boundaries with arbitrary shapes. In this work, the scatterer is comprised of a lossy, dispersive dielectric region backed by a metallic region. The method computes the equivalent currents on the boundaries of the scatterer, making use of the transmission and reflection coefficients, in order to generate the scattered field of the structure. The accuracy of the method has been validated with experimental measurements of a vortex lens operating in reflection mode at millimeter wave frequencies.