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Dual-Band Balun using Metamaterial  

Oh, Hee-Seok (School of Electrical Engineering, Seoul National University, INMC)
Nam, Sang-Wook (School of Electrical Engineering, Seoul National University, INMC)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.8, 2008 , pp. 35-40 More about this Journal
Abstract
This paper proposes a dual-band balun which is based on Wilkinson power divider. By inserting $\lambda/2$ transmission line between port 2 and 3, this balun shows good matching at all ports and improved isolation. We use matamaterial(CRLH, D-CRLH) structure for a miniaturization of the circuit implementation and dual-band operation at TDMB frequency range(195MHz) and DVB-H frequency range(670MHz). The proposed balun is designed with return loss larger than -12.98dB at all port, and isolation larger than -12.4dB, the amplitude imbalance between output signals less than 0.08dB, also phase differences of outputs less than $2.8^{\circ}$.
Keywords
Balun; Balance(unbalance) Signal; CRLH; D-CRLH; Improve Isolation and return loss;
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  • Reference
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