A Miniaturized MIMO Antenna With Dual-Band for 5G Smartphone Application

In this paper, a dual-band multiple-input and multiple-output (MIMO) antenna with ceramic substrate is designed for the miniaturized application in 5G smartphone. The proposed method of miniaturization is different from the traditional ceramic loading technique. It is a new method which not only associated with the path extending technique but also combined with the parasitic sub method so that a 68% size miniaturization is achieved. The antenna prototype is fabricated to demonstrate the proposed method. The simulated and measured results indicate that the MIMO antenna has an excellent performance in the frequency band of 3.4 - 3.93 GHz & 4.5 - 5.3 GHz (reflection coefficients < -6 dB) where its isolations are over 10 dB, envelope correlation coefficients (ECCs) are lower than 0.23 and efficiencies are higher than 50%. At last, the on-body effects of the proposed design are analyzed to guarantee the robustness in practical application.