Prof.  Xiaoming  Chen
Xi’an Jiaotong University,  China

Title: In-band Decoupling for Dual-band Shared-Aperture Base Station Arrays

Abstract:

Multiple-output multiple-input (MIMO) techniques have been employed ubiquitously in the fifth-generation (5G) cellular systems. Due to the limited space and the broad bandwidth to be covered, multi-band shared aperture base station (BS) antennas are highly soughed. When the in-band antenna elements are arranged closely to each other, the strong mutual coupling can lead to severe MIMO performance degradation. Moreover, cross-band coupling and scattering can severely distort the radiation patterns of the BS antennas, further degrading the MIMO performance. While there have been in-band (cross-band) decoupling techniques for single-band (multi-band) BS arrays. Little effort has been exerted in coping with the in-band coupling in multi-band BS arrays. In this talk, several promising decoupling techniques for base station (BS) arrays are discussed first. In particular, the dielectric superstrate based decoupling method is presented in details to reduce the couplings between co-polarized and cross-polarized antenna elements in realistic dual-polarized BS arrays. It is first applied to a single-band BS array with half-wavelength spacing between horizontal elements from 3.3 to 3.8 GHz (about 14% decoupling bandwidth). Then, a discretized version of the dielectric superstrate is introduced to reduce the in-band coupling of a dual-band shared aperture BS array. Furthermore, the method can be used in combination with the existing cross-band decoupling methods to achieve in-band and cross-band decoupling.

Biography:

Xiaoming Chen received the B.Sc. degree in electrical engineering from Northwestern Polytechnical University, Xi’an, China, in 2006, and M.Sc. and Ph.D. degrees in electrical engineering from Chalmers University of Technology, Gothenburg, Sweden, in 2007 and 2012, respectively. From 2013 to 2014, he was a postdoctoral researcher at the same University. From 2014 to 2017, he was with Qamcom Research & Technology AB, Gothenburg, Sweden. Since 2017, he has been a professor at Xi’an Jiaotong University, Xi’an, China. His research areas include MIMO antennas, over-the-air testing, reverberation chambers. He has published more than 170 journal articles on these topics. Prof. Chen currently serves as an Associate Editor for IEEE Transactions on Antennas and Propagation, and a Track Editor for IEEE Antennas and Wireless Propagation Letters. He was the general chair of the IEEE International Conference on Electronic Information and Communication Technology (ICEICT) in 2021. He won the first prize of universities’ scientific research results in Shaanxi province, China, 2022. He received the IEEE outstanding Associate Editor awards 6 times from 2018 to 2023, and URSI (International Union of Radio Science) Young Scientist Award 2017 and 2018.