Title :
A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics
Author :
Caloz, C. ; Itoh, Takayuki
Author_Institution :
Electr. Eng. Dept., Univ. of California, Los Angeles, CA, USA
Abstract :
A novel backward directional coupler, composed of a conventional microstrip (CμS) line and composite right/left-handed (CRLH) line, is proposed. This coupler is functionally backward but it is based on a forward-type coupling phenomenon. The coupler is shown to exhibit broad bandwidth and tight coupling characteristics. The theoretical circuit-model results are supported by full-wave and experimental evidence. A quasi 0-dB prototype with more than 50% bandwidth is demonstrated.
Keywords :
microstrip directional couplers; nanocomposites; backward directional coupler; broadband coupling; circuit-model; composite right-handed backward-wave directional coupler; coupled-line coupler; forward-type coupling phenomenon; left-handed backward-wave directional coupler; metamaterials; microstrip lines; tight coupling; Bandwidth; Coupling circuits; Directional couplers; Distributed parameter circuits; Frequency; Metamaterials; Microstrip; Prototypes; Shunt (electrical); Transmission line theory;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2003.821506
