A Performance Enhanced Port Extended Dual-Band Wilkinson Power Divider

A novel dual-band 3-dB Wilkinson power divider (WPD) is presented that requires only partial port extension. The design methodology is based on the impedance matching technique and is very simple and intuitive with very simple closed-form formulations. The proposed technique has free variable(s) that add extra flexibility during the design and implementation. Continuous variation of isolation element(s) with band ratio (=f2/f1) is no more required and is a distinct feature of this approach when compared with the conventional port extension technique. To enhance the band-ratio further, a technique, which utilizes port extension on all ports, is also demonstrated through an example. The band ratio of the proposed WPD is moderately wide, starting from 1.5 and going beyond 4. A flowchart of the proposed scheme is also reported that aids the systematic design procedure. The presented theory is validated through design and measurement of a prototype fabricated to operate at 0.9/3.5 GHz concurrently. The simulation and the measurement exhibit good agreement.