Hui Li
Professor Supervisor of Doctorate Candidates Supervisor of Master's Candidates
Main positions:信息与通信工程学院副院长
Gender:Female
Alma Mater:Royal Institute of Technology
Degree:Doctoral Degree
School/Department:School of Information and Communication Engineering
Discipline:Communication and Information Systems. Electromagnetic Field and Microwave Technology
Business Address:No. 2, Linggong Road, Dalian University of Technology, Dalian, Liaoning Province; 116024
Contact Information:hui.li@dlut.edu.cn
E-Mail:hui.li@dlut.edu.cn
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Indexed by:期刊论文
Date of Publication:2017-03-01
Journal:IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Included Journals:SCIE、EI
Volume:65
Issue:3
Page Number:1522-1527
ISSN No.:0018-926X
Key Words:Mobile antenna; multi-antennas; multiple-input multiple-output (MIMO); specific absorption rate (SAR)
Abstract:Measuring multiple-input multiple-output (MIMO) specific absorption rate (SAR) is an important part of mobile handset evaluation, following the introduction of uplink MIMO transmission schemes in long-term evolution advanced systems. However, the measurement of MIMO-SAR is complex and time consuming. In this communication, six unique dual-antenna mobile handsets, including both typical and novel designs, are analyzed to determine the dependence of MIMO-SAR on antenna configuration and correlation. It is found that, for certain antenna configurations, the location of the maximum MIMO-SAR and the corresponding relative phase between the ports can be predicted. This can be applied to drastically reduce measurement time. In addition, dual antennas with low envelope correlation coefficients in the radiation patterns also offer near-orthogonal electric near fields. This leads to smaller MIMO-SAR than stand-alone SAR (S-SAR) over all relative phases, making MIMO-SAR measurement unnecessary. The results also provide guidelines for designing multi-antenna handsets with low SARs. For verification, the S-SAR and MIMO-SAR at a relative phase of 0 degrees were measured for several prototypes. The measured SAR distributions showed good agreement with the simulated ones.
Hui Li was born in Heilongjiang province, China. She received the B.E. degree in optical engineering from Tianjin University (TJU), China, in 2007 and Ph.D degree in electrical engineering from the Royal Institute of Technology (KTH), Sweden, in 2012. She is currently an associate professor at Dalian University of Technology. Research Interests:Multiple input multiple output systems, millimeter wave antenna, implantable antnena, RFID, theory of characteristic mode and etc.
