Abstract
In this paper, we have introduced a compact eight-element antenna array for triple-band MIMO (multi-input multi-output) operation in 5G (fifth generation) mobile terminals, which consists of two symmetric four-element sub-arrays disposed, respectively, along two long side-edges of the system ground plane of the mobile terminal. This antenna element can operate at two dual-wideband of 3250-3820 MHz and 4790-6200 MHz with three resonance frequencies which can fully cover 5G NR (New Radio) BandN78 (3300-3800 MHz), China 5G-Band of 4800-5000 MHz and LTE Band-46 (5150-5925 MHz). The main parameters that characterize the performance of the proposed MIMO antenna system, such as bandwidth, reflection coefficient, isolation (more than 10.5 dB), total radiation efficiency (more than 43%), ECC (envelope correlation coefficient, less than 0.12) and CC (channel capacity, 34.9-37.6 bps/Hz), are analyzed and presented in this paper. Besides, the effects of single-hand and dual-hand on performance of the MIMO antenna system are also discussed. The structure of antenna element is only 15 mm × 3 mm (0.175 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.035 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> , λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the free-space wavelength at the frequency of 3.5 GHz) with a very small ground clearance of 13 mm × 2 mm on the main board of the proposed mobile terminal. The antenna system has the possibility to be used in 5G mobile terminals with triple-band operation, narrow frame and large display. The corresponding antennas prototype is fabricated and measured; and a quite good agreement between simulation and measurement is obtained.
Highlights
INTRODUCTIONIn the coming era of 5G (fifth generation) mobile communication, the world is in full swing with antenna designs for mobile terminals and base stations with higher transmission rate, shorter latency and higher access rate, which have absolute advantages over the current 4G (fourth generation) system
In the coming era of 5G mobile communication, the world is in full swing with antenna designs for mobile terminals and base stations with higher transmission rate, shorter latency and higher access rate, which have absolute advantages over the current 4G system
We proposed an 8 × 8 multi-input multi-output (MIMO) antenna system with the advantages of small dimensions in horizontal and vertical planes of the mobile terminal and triple-band (3300-3800 MHz, 4800-5000 MHz and 5150-5925 MHz) operations, both of these two characteristics are better than those proposed in literature [17]–[39] when considering the MIMO antenna system combined with configuration of mobile terminal from the perspective of comprehensive parameter or performance, which has the great potential to meet the requirements of the future ultra-thin 5G mobile terminals with narrow-frame and wide-screen
Summary
In the coming era of 5G (fifth generation) mobile communication, the world is in full swing with antenna designs for mobile terminals and base stations with higher transmission rate, shorter latency and higher access rate, which have absolute advantages over the current 4G (fourth generation) system. This result accords with the conclusion, and reflects that the coupling between antennas in the multi-antenna system will change the original resonant frequency point and bandwidth of the antenna element therein at different degrees. The simulated average SAR values at different resonant frequencies are under the SAR limit of 1.6 W/kg for 1-g tissue, which are acceptable for practical mobile applications
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