Wideband Multi-way Filtering Power Divider With Wide Stopband Using Looped Couple-Line Structures Based On A New Multi-port Topology

Abstract

This letter presents a new compact wideband multi-way filtering power divider (FPD) based on a new compact multi-port topology with wide stopband and high selectivity using looped couple-line structures. With the novel multi-port topology, a new four-way FPD is designed by adopting only one modified multi-mode resonator, the resonant modes are flexibly controlled to achieve power splitting and quasi-elliptic filtering functions. Four isolated resistors are loaded in an easily realizable form to achieve high in-band isolation. In comparison with other existing designs, the proposed multi-port FPD design stands out by not only its satisfactory operation performance, but also compact multi-way topology with only one multi-mode resonator. For demonstration purposes, the designed triple-mode FPD is simulated by the EM simulator Ansys HFSS, which further validates the feasibility of the design. Results show that the new FPD exhibits wide stopband with five transmission zeros outside the passband, 20dB harmonic suppression up to 7.85 GHz (2.8f0 (f0=2.8 GHz)).