A miniaturized ultra-wideband Wilkinson power divider using non-uniform coplanar waveguide

In this paper, the design of an ultra-wideband Wilkinson power divider (WPD) using non-uniform coplanar waveguide (CPW) is introduced. The main idea is to replace the conventional CPW by a non-uniform one that achieves the ultra-wideband operation. To generate the non-uniform design, the even and odd mode circuits are analyzed, and the Fourier series expansion is embedded in an optimization process. Then, three resistors are incorporated to improve the output port’s isolation over the entire band. A Full-wave simulation is performed using HFSS. The new divider has a compact size, enhanced bandwidth (0.2 GHz-14 GHz), and isolation better than –10 dB.