A 2.2–82-GHz Ultrabroadband Wilkinson Power Divider Using a Multisection Folded Inductor in 130-nm SiGe BiCMOS

Abstract

An ultrabroadband Wilkinson power divider employing a single-folded inductor is presented. Unlike conventional designs with discrete inductors, this work utilizes a multisection topology with a symmetric inductor that leverages mutual inductance to significantly extend the fractional bandwidth (FBW). The divider achieves over 10-dB return loss and isolation across 2.2–82 GHz, corresponding to a 190% FBW. Plus, custom-designed metal-oxide–metal (MOM) shunt capacitors and resistors are embedded at the crossing section of the inductor paths to reduce parasitic inductance and additional loss, achieving 2.2-dB insertion loss at 80 GHz. Furthermore, the measured amplitude and phase imbalances are under 0.1 dB and 0.3°, respectively, due to a novel electrical length compensation technique. To the best of the authors’ knowledge, this design offers the widest FBW reported to date among Wilkinson power dividers.