Volume 31 Issue 6
Nov.  2022
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CHU Qingxin and ZENG Wenfeng, “Antenna Decoupling Based on Characteristic Modes Cancellation,” Chinese Journal of Electronics, vol. 31, no. 6, pp. 1138-1145, 2022, doi: 10.1049/cje.2022.00.146
Citation: CHU Qingxin and ZENG Wenfeng, “Antenna Decoupling Based on Characteristic Modes Cancellation,” Chinese Journal of Electronics, vol. 31, no. 6, pp. 1138-1145, 2022, doi: 10.1049/cje.2022.00.146

Antenna Decoupling Based on Characteristic Modes Cancellation

doi: 10.1049/cje.2022.00.146
Funds:  This work was supported in part by the National Natural Science Foundation of China (61671207) and the Key Program of Marine Economy Development (Six Marine Industries) Special Foundation of Department of Natural Resources of Guangdong Province (GDNRC[2020]009)
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  • Author Bio:

    Qingxin CHU is an Professor with the School of Electronic and Information Engineering, South China University of Technology, the Vice-chair of China Electronic Institute (CEI) Antenna Society, the Vice-chair of CEI Propagation Society, IEEE Fellow and CEI Fellow. He has published two books and more than 600 papers in journals and conferences with over 4000 SCI citations. He has been elected as the Highly Cited Scholar by Elsevier in the field of electrical and electronic engineering since 2013. He has authorized more than 70 invention patents of China. He was the recipient of the Science Awards by CEI in 2018 and 2016, the Science Award by Guangdong Province of China in 2013, the Science Awards by the Education Ministry of China in 2008 and 2002. His current research interests include antennas and microwave devices in wireless communication. (Email: qxchu@scut.edu.cn)

    Wenfeng ZENG was born in Guangdong Province, China. He received the B.E. degree from Xidian University, Xi’an, Shaanxi, China, in 2018. He is currently pursuing the Ph.D. degree with the South China University of Technology, Guangzhou, China. His research interests include the theory of chrarcteristic mode and antenna decoupling. (Email: eezengwenfeng@mail.scut.edu.cn)

  • Received Date: 2022-05-24
  • Accepted Date: 2022-08-29
  • Available Online: 2022-09-20
  • Publish Date: 2022-11-05
  • The demand for a high transmission data rate in 5G leads to the wide application of the multi-input, multi-output (MIMO) technique. However, the narrow design space in mobile phone causes severe unexpected coupling between antenna units and deteriorate the system performance dramatically. In this paper, we focus on the antenna coupling within the MIMO system. Some decoupling techniques are summarized, such as neutralization line, decoupling network, common/differential mode cancellation, etc. Finally, new decoupling research developments of modal currents cancellation based on the theory of characteristic mode are elaborated. Two design examples are shown to validate the benefit of the proposed decoupling method. The −6 dB impedance bandwidth of the head-to-head antenna pair can cover 3.4–3.6 GHz. The isolation level is improved from more than 3.7 dB to more than 13 dB. The tail-to-tail antenna pair can cover 3.3–5 GHz and the isolation level is improved from more than 5 dB to more than 10 dB in the whole operating bandwidth. Both antenna pairs can achieve an envelop correlation coefficient of less than 0.2 and the antenna efficiencies are more than 40%.
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