The main applications of inhomogeneous materials with a continuous spatial variation of the electromagnetic properties as substrates for radiation components in the microwave and millimeter wave ranges are presented in this contribution. Firstly, we describe the way to obtain this kind of materials in the considered frequency ranges; secondly, we present some applications of such materials as substrates for integrated planar antennas showing the improvements respect to homogeneous ones. Particularly we can observe improvements both in the radiation and in the scattering characteristics of such antennas.
Vegni, L., Toscano, A., Bilotti, F. (2000). Properties of inhomogeneous materials for microwave radiation components, 4097, 85-95 [10.1117/12.390603].