Title :
Shielding and radiation characteristics of planar layered inhomogeneous composites
Author :
Vegni, Lucio ; Toscano, Alessandro ; Bilotti, Filiberto
Author_Institution :
Dept. of Appl. Electron., Univ. di Roma Tre, Rome, Italy
Abstract :
We propose an analytical study in the spectral domain of inhomogeneous layers that are characterized in terms of transmission matrices leading to an equivalent circuit representation of the whole multilayered structure. Within the framework of this two-port formalism, we present a new contribution to the computation of the Green´s function arising in the analysis of multilayered integrated antennas loaded with inhomogeneous materials. Such materials offer new degrees of freedom and, besides, may allow pattern control, frequency shifting, and enlargement of the bandwidth. We also propose an analytical study of the shielding effectiveness of isotropic inhomogeneous materials located in a multilayered configuration. The expression for the shielded fields sustained both by plane wave and arbitrary sources is deduced in a closed analytical form. Numerical results are also presented showing the effects of the electromagnetic parameters on radiation pattern, matching properties and radar cross section of the integrated structure.
Keywords :
Green´s function methods; antenna radiation patterns; antenna theory; composite materials; electromagnetic field theory; electromagnetic shielding; equivalent circuits; inhomogeneous media; matrix algebra; multilayers; radar cross-sections; radiowave propagation; spectral analysis; Green function; antenna pattern control; closed form; equivalent circuit representation; frequency shifting; inhomogeneous layers; isotropic inhomogeneous materials; isotropic materials; multilayered integrated antennas; multilayered structure; planar layered inhomogeneous composites; radar cross section; radiation characteristics; radiation pattern; shielding characteristics; shielding effectiveness; spectral domain; transmission matrices; Antenna radiation patterns; Bandwidth; Electromagnetic radiation; Electromagnetic shielding; Equivalent circuits; Frequency; Green´s function methods; Loaded antennas; Pattern matching; Transmission line matrix methods;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2002.802099