RESEARCH ARTICLE Generalized high-isolation n-way Gysel power divider with arbitrary power ratio and different real terminated impedances Haopeng Wu 1 | Yongle Wu 1 | Qinghua Yang 2 | Weimin Wang 1 | Ahmed A. Kishk 3 1 School of Electronic Engineering, Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China 2 HunterSun MEMS Co., Ltd., Suzhou, China 3 Department of Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada Correspondence Yongle Wu and Weimin Wang, School of Electronic Engineering, Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, P.O. Box. 282, 100876 Beijing, China. Email: wuyongle138@gmail.com (Y. W.) and wangwm@bupt.edu.cn (W. W.) Qinghua Yang, HunterSun Electronics Co., Ltd., Suzhou, China. Email: yangqinghua@tsinghua.org.cn Funding information National Natural Science Foundations of China, Grant/Award Numbers: 61971052, 61671084, 61821001 Abstract An exact closed-form design approach for a generalized high-power n-way Gysel power divider is proposed. The power divider could be designed to achieve an arbi- trary power ratio with the flexible multiway application, arbitrary real terminated impedance, excellent isolation, and easy fabrication through both planar and three- dimensional structures. Moreover, this improved power divider could maintain high power processing capacity through the coaxial cavity transmission line and grounding resistances. The exact analytical solutions related to ideal port matching and high isolation are obtained based on the circuit and transmission-line theory. To verify the proposed approach, a compact 3-way coaxial power divider with a pre-designed power ratio of 1:1.5:2 and four different real terminated impedances of 50, 55, 60, and 65 Ω is designed and fabricated. Excellent agreement is achieved between the simulated and measured results. Measurements from 4.7 to 5.7 GHz show that the return losses of all input and output ports are better than 15 dB. The maximum insertion loss is 0.5 dB, and the phase imbalance is approximately less than 6.1  . In addition, the isolation between any two output ports is better than 23 dB from 4.5 to 6 GHz. Meanwhile, the power handling capability can reach the maximum power of the commercial 50 Ω SMA connectors (2.098 kW). KEYWORDS arbitrary power division, arbitrary real terminated impedances, excellent isolation, generalized n-way Gysel power divider, high power 1 | INTRODUCTION As a hot field of industrial electronics, lots of research on high-performance RF/microwave devices have been performed. 1-4 Among these devices, the power divider (PD) undoubtedly plays a fundamental role in the wireless industrial-electronics systems. With the continuous upgrading of wireless industrial- electronics communication and controlling systems, the demand for multi-function PDs is growing. These multi-function PDs have a multi-band application, 5 isolation bandwidth improvement, 6 arbitrary power ratio, 7 multi-way transmission, 8 and so on. It is evident that there are lots of great research has been done on the conventional PDs. 9-17 Meanwhile, multiple implementations of multi-way PDs are widely proposed in References 18-32. A novel optimization method of Gysel PD(GPD) with arbitrary power ratio and impedance matching is proposed in Reference 12, and broadband GPDs with arbi- trary power ratio or new source to load impedance matching have been reported in References 13-17. However, these GPDs are improved on the basis of two branches and not flex- ible in the number of ways. In order to achieve more efficient power distribution, lots of different forms of multi-way PDs have recently been invented. For instance, a design method for high-isolation n-way power combiners is proposed based Received: 13 July 2019 Revised: 1 September 2019 Accepted: 11 October 2019 DOI: 10.1002/mmce.22016 Int J RF Microw Comput Aided Eng. 2019;e22016. wileyonlinelibrary.com/journal/mmce © 2019 Wiley Periodicals, Inc. 1 of 13 https://doi.org/10.1002/mmce.22016