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GuidedWave Propagation Characteristics of FullyIntegrated CoplanarWaveguide Metamaterials with Distributed Loading
Jing GAO Lei ZHU Keren LI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E91C
No.1
pp.3440 Publication Date: 2008/01/01 Online ISSN: 17451353
DOI: 10.1093/ietele/e91c.1.34 Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application) Category: Artificial and Nolinear Materials Keyword: transmission line metamaterials, coplanarwaveguide, periodic structure, guidedwave, lefthanded and righthanded passbands,
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Summary:
Transmission line metamaterials on coplanar waveguide with seriescapacitive and shuntinductive distributed loading in periodical intervals are characterized using our developed fullwave selfcalibrated method of moments. Firstly, the two effective perunitlength transmission parameters, i.e., complex propagation constant and characteristic impedance, are numerically extracted. The results provide a straightforward insight into the forward and backwardwave propagation characteristics in several distinctive bands, including the left and righthanded stopbands and passbands. In particular, it is demonstrated that in the whole lefthanded passband, the propagation constant has purely negative phase constant while the characteristic impedance has only positive real quantity. Next, varied left and righthanded passbands are studied in terms of lower/higher cutoff frequencies based on ideal equivalent circuit model and practical distributed CPW elements, respectively. Of particular importance, the lefthanded and righthanded passbands find to be able to be directly connected with a seamless bandgap under the condition that normalized inductance and capacitance of loaded CPW inductive and capacitive elements become exactly the same with each other. Finally, the 9cell metamaterial circuits on CPW with actual 50 Ω feed lines are designed and implemented for experimental validation on the derived perunitlength parameters.


