Investigation Of The Decoupling Methods For 5G Millimeter-Wave MIMO Dielectric Resonator Antennas

Nowadays,with the rapid development of wireless communication,the wireless communication technology will enter the era of 5G communications.At present,more and more users and equipments consume more data than before,the wireless network is facing the problem of spectrum shortage.Due to its rich spectrum resources,the millimeter-wave(mm-wave)spectrm becomes a potential choice for the 5G communication system.Dielectric resonator antenna has low loss in mm-wave band,therefore,it has great potential application value.Since MIMO technology can significantly increase the system channel capacity without increasing spectrum resources and antenna transmission power,it has become one of the key technologies of 5G communication system.With the trend of miniaturization of mobile communication equipments,the contradiction between miniaturization of MIMO antenna and high isolation between antenna elements has become a difficult problem in antenna design and one of the hot topics nowdays.In this context,this paper focuses on the design of mm-wave MIMO DRA with high isolation.The main work of this article is as follows:(1)A decoupling method of using metallic vias to improve the isolation of E-plane coupling mm-wave MIMO DRA is investigated.It can significantly improve the isolation of the antenna,reduce the envelope correlation coefficient,correct the distorted pattern and improve the antenna gain by choosing a suitable number of metal vias and ingeniously arranging the position of metal vias.The metal vias are easy to process and don't occupy extra space of the antenna.(2)A decoupling method of using metallic vias to improve the isolation of H-plane coupling mm-wave MIMO DRA is proposed.As the field distributions of antenna vary with its polarization,the mutual soupling between antenna elements and hence the decoupling schemes should be quite different accordingly.The position,radius and number of corresponding metal vias have to be redesigned.Similarly,as long as the metal vias are reasonably arranged in the DRA elements,the isolation between the elements can be greatly improved and the DRA elements can obtain good radiation characteristics.(3)A decoupling method of loading metallic patches to improve the isolation of H-plane coupling mm-wave MIMO DRA is proposed.Ulike the decoupling technologe in the last work only feasible for two antenna elements,this decoupling approaches can reduce mutual coupling among multiple antenna elements.Finally,an H-plane coupling three-element mm-wave MIMO DRA is taken as an example to demonstrate the effectiveness of this method.The metallic patches are easy to design and don't occupy extra space of the antenna.