Title :
Transmission-Line Model of Noisy Electromagnetic Media
Author :
Syms, Richard R. A. ; Sydoruk, O. ; Solymar, Laszlo
Author_Institution :
EEE Dept., Imperial Coll. London, London, UK
Abstract :
A transmission-line model of thermal noise in 1-D electromagnetic (EM) media is presented that can find both the magnetic and the electric contributions to the noise in arbitrary arrangements of isotropic material. The model is used to compute the noise performance of a negative-index metamaterial slab based on split-ring resonators and rods, when magnetic and electric noise are both significant. It is shown that the former rises rapidly in the range when negative index effects are obtained, due to the lossy magnetic resonance. Results for infinite and finite media are compared, and the effect of size is discussed. Results for the slab are also compared with the indirect prediction of standard EM theory, and shown to be identical.
Keywords :
absorbing media; electromagnetic metamaterials; resonators; thermal noise; transmission line theory; EM media; electric contributions; finite media; infinite media; isotropic material; lossy magnetic resonance; magnetic contributions; negative-index metamaterial slab; noisy electromagnetic media; rods; split-ring resonators; transmission-line model; Equations; Magnetic noise; Mathematical model; Media; Noise; Thermal noise; Transmission lines; Fluctuation-dissipation theorem; Johnson noise; metamaterial; negative index; thermal noise;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2012.2226742
