MIMO antenna isolation technology and isolation devices

With the rapid development of 5G technology, 5G mobile phone shipments are gradually increasing. The latest 5G mobile phones released already have more than a dozen 5G antennas. Under the current mainstream antenna configuration, the low-frequency antenna of 4G uses 2xMIMO, the antennas of each frequency band of 5G use 4xMIMO, the GPS uses dual antennas, and the Wi-Fi frequency band uses dual-band 2xMIMO. In addition, a 4/5G diversity (horizontal screen) antenna is set in the middle of the side to ensure signal quality at all times. So many antennas occupy almost all the sides of the mobile phone, and there is a risk of mutual interference between multiple antennas on the same frequency or close to the frequency, which greatly increases the difficulty of design. In comparison, the number of antennas in mobile phone terminals in the 4G era has never reached double digits. Regarding the coupling interference problem of multiple antennas, the following technical report provides a detailed discussion and analysis and provides a more effective solution.

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