Taper transmission line UWB Wilkinson power divider analysis and design

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Abstract
This paper proposed, analysed and fabricated an ultra-wideband Wilkinson power divider. This proposed power divider contains two parts, namely the transmission lines with fixed characteristic impedance and the tapered transmission line. The power divider has a fixed architecture with the ability to broaden for different bandwidths by changing its circuit parameters including resistors and impedances. It also can create a bandwidth of about 40 GHz with a smaller physical dimension and fewer numbers of resistors. The proposed power divider is investigated using the even/odd analysis method in order to compute equations required for designing power divider. The proposed power divider was designed and fabricated for the 3-11 GHz ultra-wideband range. Then, the results are compared with the simulated results and a good agreement is obtained consequently. Furthermore, input return loss better than 12dB, output return loss better than 15dB, insertion loss better than 4.8dB and output ports isolation less than 12 dB are achieved by measured results. The overall size of the proposed power divider is 14.2 × 4.8 mm2.

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