Wideband Four-Way Filtering Power Divider With Sharp Selectivity and Wide Stopband Using Looped Coupled-Line Structures

• Published in: IEEE microwave and wireless components letters Vol. 26; no. 6; pp. 413 - 415
• Main Authors: He Zhu, Abbosh, Amin M., Lei Guo
• Format: Journal Article
• Language: English
• Published: IEEE 01.06.2016
• Subjects: Design parameters; Filtering; Filtering power divider; Filtering theory; Filtration; four-way power divider; Joining; looped coupled structure; Loss measurement; Microwaves; Ports; Ports (Computers); Power dividers; Rejection; sharp selectivity; wide stopband; Wideband; Wireless communication; looped coupled structure; wide stopband; four-way power divider; sharp selectivity; Filtering power divider
• ISSN: 1531-1309; 1558-1764
• 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.