Wideband Decoupling Smartphone Antenna with Integrated Metal Rim

A wideband decoupling four-element multiple-input–multiple-output (MIMO) antenna based on Common and Differential Mode (CDM) impedances Analysis for 5G smartphones is proposed. For the antenna pairs, in high frequency band, self-decoupling is realized. In low frequency band, a shorting stripe is added to adjust CM and DM impedances so that they can be close to each other and high isolation is obtained. Finally, the isolation is better than 13 dB in the whole operating band (3.3-5.0 GHz). The model is also fabricated and measured, and both simulated and measured results are discussed.