Wideband Filtering Power Divider With Ultra-Wideband Harmonic Suppression and Isolation

Yongle Wu, Zheng Zhuang, Yuanan Liu, Li Deng, Zabih Ghassemlooy
2016 IEEE Access  
In this paper, a wideband filtering power divider (PD) with ultra-wideband harmonic suppression and isolation is proposed. The dual coupled-line sections are embedded to the conventional quarter-wavelength transmission lines, which helps to extend the passband of the PD. With the introduction of the short-circuit stubs shunted at the output ports and the coupled lines with the open-circuit stubs, the ultra-wide stopband can be implemented more efficiently, thus resulting in five transmission
more » ... ive transmission zeros from 2 to 6 GHz. Furthermore, the improved isolation structure with series connected a resistor and a capacitor can be utilized to realize the ultra-wide isolation frequency band. Using a single resistor between two output ports, we have achieved an excellent in-band isolation. For demonstration, a wideband filtering PD operating at 1 GHz with a 20-dB bandwidth of 50% and an ultra-wide stopband better than 20 dB from 2 to 6 GHz is designed, fabricated, and measured. The measured results agree well with the anticipation. INDEX TERMS Filtering power divider, harmonic suppression, ultra-wideband, coupled-line, improved isolation.
doi:10.1109/access.2016.2613883 fatcat:vfyhvnjdarcfpdys6y2v4i3yii