Microwave invisibility cloaks based on frequency selective surfaces

Abstract

In this report the successful design, manufacturing and testing of Mantle Cloaking is presented. This relatively new technique goes beyond traditional metamaterial-based alternatives in the search for effective invisibility at the microwave range. In lieu thereof, Scattering Cancellation consists in optimizing the main coefficient affecting the scattered field with the aim of making it as low as possible. To do that at a certain frequency, the surface impedance of the cloak that provides this minimum value has to be calculated and properly manufactured. Since the cell surface impedance of Frequency Selective Surfaces can be mathematically characterized, this work will focus on the verification of every outcome and the computation of the impedance of the entire cloak from the point of view of simulation. Once this is confirmed, real measurements have determined the degree of reliability of the method and the accuracy of the results.