A novel composite right-/left-handed coupled-line directional coupler with arbitrary coupling level and broad bandwidth

By Christophe Caloz, Atsushi Sanada, Tatsuo Itoh. IEEE transactions on microwave theory and techniques, 2004

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A Design Technique for Concurrent Dual-Band Harmonic Tuned Power Amplifier (2008, background): “A possible solution could be represented by the use of metamaterials to design multifrequency matching networks [20], [21], for instance, 0018-9480/$25.00 © 2008 IEEE as proposed in [22] for the design of a dual-band class E PA.”
Electronically scanned composite right/left handed microstrip leaky-wave antenna (2004, methodology): “In the lossless case of ideal CRLH-TL [6], the equivalent circuit model is shown in Fig.”
Metamaterial-based electronically controlled transmission-line structure as a novel leaky-wave antenna with tunable radiation angle and beamwidth (2004, methodology): “explained by a dispersion curve with parameters extracted from the equivalent-circuit model [10].”
Compact Quarter-Wave Resonator and Its Applications to Miniaturized Diplexer and Triplexer (2011, background): “Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org.”
A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics (2004, methodology): “Using a similar LH/LH configuration, a backward coupler with arbitrary coupling level, broad bandwidth and unique operation principle was later demonstrated in [9] and fully explained in [ 11 ].”