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A dual-band printed metamaterial coupler made of a microstrip line and a generalized negative-refractive index line is presented. Due to the presence of two left-handed bands in the unit cell, backward coupling occurs over two frequency ranges centered on 2.7 GHz and 4.7 GHz. Measured results for an edge-coupled device are reported.
Anomalous negative group velocity (NGV; group velocity antiparallel to the power flow) is reported in a guided-wave structure supporting complex modes. This structure consists of a coupled-line system comprising a positive-index microstrip line edge coupled to a negative-index line. The NGV can be observed on the positive-index line under suitable excitation and termination conditions. What is remarkable...
The existence of negative group velocity in the complex-mode region of an infinite length MS/NRI transmission-line coupler is shown. The negative group velocity is associated with only one of the complex modes (c-mode) and exists only when that mode is dominantly excited. The possibility of independently exciting either of the complex modes in an infinite coupler is discussed. A method is proposed...
This paper summarizes some of the recent advances in planar transmission-line metamaterials. First the issue of spatial harmonics excited in negative-refractive-index transmission-line (NRI-TL) is examined. It is shown that the fundamental backward-wave harmonic becomes dominant under the long wavelength regime. Subsequently the issue of the independent excitation of complex modes in a microstrip...
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