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8. J. S. Lim, U. H. Park, Y. C. Jeong, K. S. Choi, D. Ahn, S. Oh, and J. J. Koo, "800-5000 MHz ultra-wideband CPW balun," Electronics Letters, vol. 42, no. 18, pp. 1037-1038, 2006. 

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12. I. H. Lin, M. DeVincentis, C. Caloz, and T. Itoh, "Arbitrary dualband components using composite right/left-handed transmission lines," IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 4, pp. 1142-1149, 2004. 

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13. N. Engheta and R. W. Ziolkowski, Metamaterials: Physics and Engineering Explorations. Hoboken, NJ: John Wiley & Sons, 2006. 

14. S. G. Mao and Y. Z. Chueh, "Broadband composite right/lefthanded coplanar waveguide power splitters with arbitrary phase responses and balun and antenna applications," IEEE Transactions on Antennas and Propagation, vol. 54, no. 1, pp. 243-250, 2006. 

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15. Edited by M. Mukherjee, Advanced Microwave and Millimeter Wave Technologies Semiconductor Devices Circuits and Systems. Rijeka, Croatia: InTech, 2010.