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Left-handed structures for microwave applications

I. A. MIHAI1,* , M. G. BANCIU2, A. IOACHIM2, N. MILITARU1, G. LOJEWSKI1, T. PETRESCU1

Affiliation

  1. Telecommunications Department, Electronics, Telecommunications and Information Technology Faculty, University Politehnica of Bucharest 1-3, Bd. Iuliu Maniu, 061071, Bucharest 6, Romania
  2. National Institute of Materials Physics, Măgurele, Jud. Ilfov, Romania

Abstract

In this paper, dispersion/attenuation diagrams are investigated for purely left-handed (PLH) and for composite right/left handed (CRLH) transmission lines. The magnitude and phase of the S parameters of these structures are analyzed in a broadband (1-7 GHz) range. The investigations on microstrip CRLH lines demonstrate the presence of the left-handed range, the stop-band (only for the unbalanced lines) and the right-handed range. By edge-coupling two such CRLH lines, devices with new properties, different from conventional microstrip devices were obtained. Symmetric and asymmetric 0 dB backward couplers working in the stop-band of the CRLH line were achieved. Very short 3 dB couplers (with only 2 or 3 unit cells) were also investigated..

Keywords

Microwaves, Left-handed structures, Dispersion diagrams.

Submitted at: April 7, 2010
Accepted at: April 26, 2010

Citation

I. A. MIHAI, M. G. BANCIU, A. IOACHIM, N. MILITARU, G. LOJEWSKI, T. PETRESCU, Left-handed structures for microwave applications, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 4, pp. 904-908 (2010)