Patent ID: 6870511

Claim:
A method for designing a multiple layer structure for transforming an electromagnetic signal having a specified polarization, the electromagnetic signal being directed through each layer of the multiple layer structure, and the method comprising the steps of: (a) specifying a frequency for the electromagnetic signal and an angle of incidence of the electromagnetic signal on the multiple layer structure; (b) providing a stacked plurality of frequency selective surface layers, a first layer being on top and one or more lower layers positioned beneath it, each layer having adjustable parameters to provide a desired transformation response and each lower layer having a rotational orientation with respect to a corresponding layer immediately above each lower layer, each layer transforming the electromagnetic signal as it passes through the layer; and (c) adjusting the parameters and rotational orientation of at least one layer so that a chosen set of polarization modes of the electromagnetic signal do not couple as the electromagnetic signal passes from one layer to a next layer.