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

Volume

1

fYear

2004

fDate

6-11 June 2004

Firstpage

301

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2004 IEEE MTT-S International

ISSN

0149-645X

Print_ISBN

0-7803-8331-1

Type

conf

DOI

10.1109/MWSYM.2004.1335877

Filename

1335877