Abstract
A composite right/left-handed (CRLH) transmission line (TL) based on a ridge substrate integrated waveguide (RSIW) is proposed and investigated. Its guided wave properties of backward-wave supporting are studied. This CRLH TL is realised by etching an interdigital capacitor on the ridge surface of the original RSIW. The CRLH TL is fabricated on a multilayer printed circuit board. Both the simulated and measured results are presented. Compared with other non-radiative CRLH waveguides proposed before, this RSIW-based CRLH TL has the advantages of miniaturised size, low profile, low cost etc. Besides, unlike other proposed planar CRLH TLs, this closed planar CRLH structure can keep the energy propagating inside so as to avoid energy leakage. Flexible designs can be developed based on this CRLH RSIW in guided-wave and radiated-wave applications.
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