Title :
A via-free microstrip left-handed transmission line
Author :
Sanada, Atsushi ; Murakami, Koichi ; Aso, Shuji ; Kubo, Hiroshi ; Awai, Kuo
Author_Institution :
Yamaguchi Univ., Tamaguchi, Japan
Abstract :
A via-free microstrip left-handed (LH) transmission line (TL) is proposed, which enables easy and low-cost fabrication of backward wave TLs. Based on the equivalent circuit, dispersion characteristics of the TL are theoretically obtained and the effect of the virtual short capacitance on the LH bandwidth is shown. The balanced/unbalanced CRLH criterion for seamless transition from the backward and forward wave propagation is also derived. The microstrip LH TL is implemented and the backward wave support is confirmed both by full-wave FEM simulations and experiments. A 38-cell TL exhibits a backward to forward scanning leaky-wave antenna capability.
Keywords :
circuit simulation; equivalent circuits; leaky wave antennas; microstrip transitions; transmission line theory; LH bandwidth; backward wave TL; backward wave propagation; backward-to-forward scanning; balanced CRLH; dispersion characteristics; equivalent circuit; forward wave propagation; full-wave FEM simulations; leaky-wave antenna; left-handed materials; left-handed transmission line; low-cost fabrication; metamaterials; microstrip LH TL; seamless transition; unbalanced CRLH; via-free microstrip; virtual short capacitance; Bandwidth; Capacitance; Dispersion; Distributed parameter circuits; Equivalent circuits; Fabrication; Leaky wave antennas; Microstrip; Transmission line theory; Transmission lines;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1335877
