Miniature Ultra-Wideband Power Divider Using Bridged T-Coils

摘要

In this work, a miniature ultra-wideband (UWB) power divider (PD) is proposed. By implementing the transmission lines of a two-stage Wilkinson PD using bridged T-coils, very compact size with no reduction in bandwidth can be achieved. Specifically, a proposed UWB two-way PD with a center frequency $f_{0}=5.5 {rm GHz}$ is implemented using the commercial GaAs pHEMT process. The circuit size without pads is only 1.45 mm $times$ 0.84 mm, which is about $0.027lambda_{0}times 0.016lambda_{0}$ at $f_{0}$ . The fractional bandwidth for 15-dB input/output return loss and isolation is 110%, and the in-band insertion loss is within 1.3 $pm$ 0.36 dB.