Utilizing the opposite phase shifting property of a standard CompositeRight/Left Handed (CRLH) transmission line (TL) and a dual structure of CRLH(D-CRLH) TL, a dual-band balun is designed. The dual-band balun is formed by a1x2 (3-dB) splitter with a D-CRLH phase-shifting line in the top branch and aCRLH phase-shifting line in the bottom branch. The performance of the balun isverified with circuit simulation at 2.4 GHz and 5.0GHz. The balun exhibits avery wide bandwidth for differential output phase, the return loss is wellbelow -100dB, and the insertion losses |S12| and |S13| are around -3.03dB atboth frequencies.
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