Dual-Band Wilkinson Power Divider with Port Extensions

This paper reports a coupled-line based dual-band Wilkinson Power Divider (WPD) with two-section transmission lines (TSTL) at all its ports. The design utilizes only one resistor as a frequency independent isolation element. The design offers its operation with good bandwidth and wide band-ratio (=f2/f1) at the two distant arbitrary frequencies. The design equations are provided to compute the design parameters. Three design examples are also tabulated in the paper with stepwise design procedure. The measurement of the fabricated prototype exhibits a good match (|Sii|>17dB, i = {1, 2, 3}), excellent isolation ((|S23|>25dB) and very good amplitude imbalance (|S21|~|S31|=0.2dB) and phase imbalance (∠S21~∠S31=2°) at both the bands. The measured results are in perfect agreement with the corresponding EM simulated results and thus validates the design.