Design of the Filtering Power Divider With Highly-Selective Bandpass Filters

Abstract

This paper proposes a power divider with integrated filtering characteristics. To enhance selectivity at the two output ports, T-shaped grounded transmission lines are incorporated into the series-connected parallel-coupled lines of the bandpass filter. Additionally, by adopting a hairpin-type configuration within the filter, extra transmission zeros are introduced, resulting in sharper roll-offs and higher attenuation around the passband edges. The proposed filtering power divider is fabricated on a Rogers RO4003C substrate, with a center frequency of 3.5 GHz and an overall circuit size of $0.4~\lambda _{\mathrm {g}} \times 0.29~\lambda _{\mathrm {g}}$ . The performance of the circuit is validated through a comparison of simulated and measured results.

Keywords

• Bandpass filter
• coupling
• power divider