Research On The Electromagnetic Properties And Applications Of Metamaterials

The successful realization of metamaterials has garnered considerable attentions and discussions all over the world. Some corresponding researches were selected as one of the top ten Research High Lights by Science in 2003 and 2006 respectively. This paper focuses on the electromagnetic properties and applications of the metamaterials. The main contents and contributions are listed as follows:1. The general expressions of Green's function in multilayerd structure consisting of metamaterials are presented. Discrete complex image method is extended to the computation of Green's function in metamaterial substrate. Method of moments based on the mixed potential integral equation is demonstrated in the metamaterial microstrip structure.2. The unexpected radiation performances of millimeter wave microstrip antennas with metamaterial substrate are studied, and potential application for directive antennas is proposed. Subwavelength cavity resonator microstrip antennas with metamaterial and conventional material bilayered substrates are proposed and investigated, corresponding breakthrough to the restricted bandwidth and application for sensors are discussed.3. A rigorous analysis of bianisotropic split ring resonator (SRR) metamaterials is presented for different electromagnetic field polarization and propagation directions. An alternative physical explanation for SRR resonance band gaps is gained by revealing the fact that imaginary wave number leads to the SRR resonance.4. SRR metamaterial based parallel plate waveguide and rectangular waveguide are examined. It is shown that different dispersion properties, such as non-cutoff frequency mode propagation and enhanced bandwidth of single mode operation, become into existence. Full wave analysis of H-guides with bianisotropic SRR metamsterials is presented. Slow wave propagation, enhanced energy flow, abnormal higher-order modes, as well as leakage suppression of longitudinal section magnetic and longitudinal section electric modes are illustrated.5. The field distribution over SRR metamaterials is expanded into Floquet modes. As is shown the metamaterial resonance is actually engendered by the evanescent Floquet modes. Transmission properties through metamaterials are then examined for arbitrary incident wave through the simulation.6. Multi-band frequency selective surface (FSS) is realized by utilizing the SRR as the basic unit cell. The relationship between the SRR parameters, incidence angle and the FSS resonance frequency is emphasized.