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Abstract
A compact coplanar waveguide-fed triple-band multiple input multiple output (MIMO) antenna is designed based on flexible substrate named liquid crystal polymer in this work. The proposed antenna comprises two antenna elements placed side by side. By adding a double Y-shaped branch between two antenna elements, good isolation is achieved successfully, which is better than 21 dB. According to the measured results, it can operate bandwidth covering 2.263–2.925, 3.063–4.5 and 4.588–7.25 GHz, meeting the radio spectrum, including 5G, WLAN and WiMAX. Moreover, the proposed antenna also has virous suitable characteristics including envelope correlation coefficient (<0.01), diversity gain (>9.99), channel capacity loss (<0.4 bits/s/Hz), the difference of mean effective gain (<0.15 dB) and total active reflection coefficient (<−10 dB). The bending test and the effect of human body have also been analyzed. The actual measurement indicates that the presented MIMO antenna is desirable for integration in wearable 5G/WLAN/WiMAX devices.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Chengzhu Du
Chengzhu Du was born in Haikou, Hainan Province, China. She received the B.S. degree from the Xidian University, M.S. degree from Nanjing University of Posts and Telecommunications and PhD degree from Shanghai University, in 1995, 2003 and 2012, respectively, all in electromagnetic wave and microwave technology. She is currently an associate Professor of Shanghai University of Electric Power. Her research interests include flexible antenna and textile antenna, multiband and wideband antennas and MIMO technologies.
Hongye Liu
Hongye Liu was born in Zigong, Sichuan Province, China in 1996. She received the B.S. degree from the Southwest Jiaotong University in 2018. She is currently pursuing the M.S. degree in College of Electronics and Information Engineering, Shanghai University of Electric Power. Her research interests include MIMO antenna, flexible antenna.
Xun Wang
Xun Wang was born in Luan, Anhui Province, China in 1996. He received the B.S. degree from the Shanghai University of Electric Power in 2018. He is currently pursuing the M.S. degree in College of Electronics and Information Engineering, Shanghai University of Electric Power. His research interests include UWB-MIMO antenna, flexible antenna and millimetre wave antenna.
Yu Nie
Yu Nie was born in Luzhou, Sichuan Province, China in 1995. She received the B.S. degree from the Sichuan University of Science and Engineering in 2018. She is currently pursuing the M.S. degree in College of Electronics and Information Engineering, Shanghai University of Electric Power. Her research interests include CPW-UWB-MIMO antenna, flexible antenna and millimeter wave antenna.
Zhipeng Yang
Zhipeng Yang was born in Yuncheng, Shanxi Province, China in 1997. He received the B.S. degree from the Shanghai University of Electric Power in 2019. He is currently pursuing the M.S. degree in College of Electronics and Information Engineering, Shanghai University of Electric Power. His research interests include UWB-MIMO antenna and flexible antenna.