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Novel composite right‐/left‐handed transmission lines using fractal geometry and compact microwave devices application
Author(s) -
Xu HeXiu,
Wang GuangMing,
Liang JianGang
Publication year - 2011
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2010rs004617
Subject(s) - fractal , microwave , geometry , composite number , left handed , microwave transmission , optics , physics , mathematics , materials science , mathematical analysis , computer science , telecommunications , algorithm
In this paper, novel electrically small resonant‐type composite right‐/left‐handed transmission lines (CRLH TLs) combining fractal geometry are proposed and systematically exploited. Two sets of planar CRLH cell structure are involved including the proposed one based on cascaded complementary single split ring resonator (CCSSRR) and improved one based on complementary split ring resonators (CSRRs). Fractal perturbation in these CRLH TLs is from the point of super compactness. The left‐handed (LH) electromagnetic wave propagation characteristic and miniaturization principle are investigated in depth by electrical simulation, EM simulation and finally demonstrated by effective constitutive EM parameters. To illustrate possible application, a dual‐band BPF covered satellite DMB band and WiMAX band, and a monoband branch‐line coupler covered GSM band are designed, fabricated, and measured. Consistent results between full‐wave simulation and measurement have confirmed the design concept. Measurement results indicate that the fractal perturbation is a good strategy for further miniaturization, enhanced selectivity and maintenance of good in‐band performance in both designs especially for the coupler which achieves a comparable 81% size reduction relative to its conventional counterpart.