Compact Eight-Antenna Array in the Smartphone for the MIMO Operation

• Main Authors: Jun-Yu Lu, 盧俊諭
• Other Authors: Kin-Lu Wong
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/02428752084619760115

碩士 === 國立中山大學 === 電機工程學系研究所 === 104 === The Massive MIMO system is one of promising techniques for the fifth-generation (5G) communications in the future. For the Massive MIMO system, increasing both the numbers of the antennas in the smartphone and base station can lead to higher channel capacity. An eight-antenna array for the 8 x 8 LTE MIMO system in the smartphone is hence presented to increase the channel capacity. The antenna array can cover the 3500 MHz LTE band (3400~3600 MHz), which is a global mobile broadband recently identified by WRC-15 for mobile communication system in the future. The eight-antenna array is formed by two quad-antenna arrays disposed along two long side edges of the system ground plane in the smartphone. The length and width of a quad-antenna array is respectively 60 mm and 1 mm only, which is suitable for application in the smartphone with a large display panel. The antenna efficiency of the eight antennas is better than 45% and the ECC is less than 0.1 between any two antennas thereof. The channel capacity of the eight-antenna array can reach about 37 bps/Hz for the 8 x 8 LTE MIMO system at 20-dB signal-to-noise (SNR). The measured data from the LTE MIMO measurement system in the OTA (over-the-air) testing verify the calculated results. Effects of the user’s hand and different measurement distances on the MIMO performance are also analyzed.