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Optimized Isotropy in Left-Handed Metamaterials
K. Matra,N. Wongkasem 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Left-handed metamaterials designed using Cn group with optimized isotropy are proposed. The structures provide 2n and 6n excitation directions where the identical response is generated for two and three dimensional models. Circuit analysis is used to design the negative index of refraction, later verified by the effective material parameters. The result shows the negative index passband with low losses.
Development of Compact Microstrip Antennas using Metamaterials
C. Kamtongdee,N. Wongkasem,B. Charoen,K. Matra 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
A new design of compact 2.4 GHz microstrip antennas, where metamaterials are placed on structure substrate, is proposed. The newly designed microstrips provide an optimized patch area resulting into a substantial reduction in size compared to a typical microstrip patch designed at the same frequency of operation. It was found that the characteristics of the novel microstrip antennas with designed metamaterials placed on the substrate are comparable to the conventional patch antennas, while their gain and radiating efficiency are noticeably improved.