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In this study, an ultra-thin CPW-fed ultra-wideband flexible MIMO antenna for Internet of Things (IoT) applications is proposed. The antenna is etched on a liquid crystal polymer (LCP) substrate. Two antenna elements of the presented MIMO antenna are placed parallelly without an isolator. The measured  S11  is less than −6 dB from 4.7 to 45 GHz, covering China’s 5G and 5G millimeter-wave bands. The measured  S21  is less than −20 dB in most bands except 8.5–11.7 GHz, and the minimum | S21 | is 15.7 dB at 10.5 GHz. In addition, the simulation and measurement results of flexible MIMO antenna indicate the antennas have good radiation characteristics, and the maximum gain can get 6.4 dB. Then ECC, DG and TARC are evaluated. The proposed antennas are suitable for 5G-enabled IoT applications.

A CPW-fed flexible ultra-wideband MIMO antenna based on liquid crystal polymer for IoT applications