Dual-Band MIMO Antenna with Small Ground Clearance for 5G Mobile Termnials

Abstract

In this paper, a compact dual-element MIMO antenna is presented for 5G mobile terminal applications. Each element has two driven monopole branches and one parasitic ground branch. All the branches operate at the $\lambda/4$ mode. The two elements are placed at the top and bottom corners of the board. The −10 dB bandwidth is sufficient to cover the 1710–2690 MHz and 3400–3600 MHz bands, also with port isolation higher than 16 dB. In addition, the theory of characteristic modes is used to analyze the internal mechanism of port isolation.