Design of MIMO antennas for 5G portable device

Abstract

This project aims to design a MIMO antennas for smartphone with 3.4-3.6GHz. The design is created and simulated by using the High Frequency Structure Simulator software. A dual-polarized antenna is designed for future 5G MIMO applications. This product is mainly designed for smartphone application. The product structure is composed of two antenna modules. One is C shape antenna on the middle side and the other one is L-shaped antenna. An 8x8 MIMO system is formed by these two sets of antenna array. The design was completed by the software-High Frequency Structure Simulator. The testing was done by Network Analyzer and Antenna Chamber. The operating frequency is about 3.5-3.7GHz which fulfils the 5G indoor standard of China Ministry of Industry and Information Technology. The impedance is well matching and all antennas have 10dB return loss or better. All the isolation is below -15dB. The antenna efficiency is higher than 50% over the desired frequency. ECC (envelope correlation coefficient) is also calculated to show the MIMO performance of this product. All the ECC is lower than 0.05 and the requirement for MIMO antennas is just below 0.1.