Wideband four-way filtering power divider with sharp selectivity and wide stopband using looped coupled-line structures
Zhu, He, Abbosh, Amin M. and Guo, Lei (2016) Wideband four-way filtering power divider with sharp selectivity and wide stopband using looped coupled-line structures. IEEE Microwave and Wireless Components Letters, 266: 413-415. doi:10.1109/LMWC.2016.2562107
A compact wideband four-way filtering PD is presented. The structure of the proposed device includes a pair of looped coupled-line structures to provide the needed power division to four output ports. Moreover, a pair of short-ended coupled-line stubs is used to introduce multiple transmission poles and transmission zeros for a sharp cut-off of the passband and high upper-stopband rejection. A detailed design procedure is shown to determine the initial design parameters. A prototype is designed, simulated and measured experimentally. The measured results show 56.5% bandwidth centered at 1.5 GHz with more than 15 dB upper-stopband rejection up to 4.15 GHz, more than 13 dB in-band isolation, and 15 dB return loss at all output ports.