Abstract
A multi-input multi-output (MIMO) antenna system for a 4G/5G full-screen metal frame smartphone with a narrow ground clearance of 2 mm is presented in this paper. The long-term evolution antenna structures (LTEAS) for the 4G communication system are devised on both short-side edges with two ports and different matching circuits. It is fully functional over 698-960 MHz (LTE low-band) and 1710-2690 MHz (LTE high-band). An RF switch is loaded on the LTEAS to form a reconfigurable LTE low-band antenna structure covering the band of LTE700. Four loop antennas on the long side edge are devised close to the LTEAS. By fully re-utilizing the structure of the LTEAS, new loop modes are generated in the 5G band. The 5G antenna structure can cover the spectrum of 3300-4500 MHz. The theory of low SAR (Specific absorption rate) is applied to antenna design. The proposed antennas can simultaneously cover a wideband of 4G and 5G with low SAR characteristics for the first time. The proposed MIMO antenna is fabricated and measured. The performances show great potential in the future 4G/5G smartphone application.
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