A Wilkinson-Type Balun Using a Composite Right/Left- Handed Transmission Line

초록

A novel balun being the structure of a Wilkinson power divider is suggested and fabricated. One of the power dividing paths in the suggested balun uses a conventional λ/4 transmission line for -90° phase shifting, and the other path uses a composite right/left-handed -λ/4 transmission line for +90° phase shifting with four series capacitors and three parallel inductors. In addition, the suggested balun uses two 50-Ω resistors and a conventional 50-Ω transmission line of λ/2 electrical length between the two output ports, achieving good isolation and reflection values of two balanced ports. The suggested balun is simulated by the advanced design system simulation program and fabricated on TLX-9 20-mil substrate. The fabricated balun has a very good values of S11 = -27.46 dB, S21 = -3.40 dB, and S31 = -3.28 dB, a phase difference of -179.5°, a magnitude difference of 0.12 dB, and a delay difference of 0.1 ns, with S22 = -36.28 dB, S33 = -27.19 dB, and S32 = -25.2 dB at 1 GHz,respectively.

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