A dual–band printed metamaterial coupler made of a microstrip line and a generalised negative-refractive-index (NRI) line is presented. Owing to the presence of two left-handed bands in the generalised negative-refractive-index transmission line (NRI-TL) unit cell, backward coupling occurs over two frequency ranges centred on 2.7 and 4.7 GHz. Measured results for an edge-coupled device are reported; peak coupling levels of −3.5 and −4.4 dB are observed.
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Ryan et al. (2012) studied this question.
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