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We propose an adaptive RF antenna system for the excitation (and manipulation) of the fundamental circular waveguide mode (TE11) in the context of high-field (7T) traveling-wave magnetic resonance imaging (MRI). The system consists of «flat» composite right-/left-handed (CRLH) meta-material ring antennas that fully conforms to the inner surface of the MRI bore. The specific use of CRLH metamaterials...
Rectangular waveguides loaded by anisotropic metamaterials are analyzed to assess the controllability of transmission characteristics of the involved electromagnetic waves. Dispersion relations of modes in the metamaterial-loaded waveguide (MLW) are theoretically investigated. It is shown that all propagating modes (the forward wave, the backward wave and the evanescent wave)...
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