Design Of 5G High Isolation MIMO Antenna Baseed On Metamaterial

With the rapid development and commercialization of 5G,higher requirements have been put forward for the various performance of antennas.MIMO antenna systems are widely used in 5G communication due to their advantages such as high capacity,high communication rate,and controllable polarization.However,the introduction of MIMO antenna technology has led to an increase in the number of antenna units,resulting in smaller distances between antenna units and strong coupling between antenna units.The coupling between MIMO antennas can seriously affect the resonance and radiation characteristics of the antenna,resulting in a significant attenuation of antenna performance.Therefore,improving the isolation between antenna units in the design of 5G MIMO antennas is an urgent problem that needs to be solved.Because of its unique electromagnetic characteristics,metamaterial will not cause attenuation of other antenna performances while decoupling,and can even achieve improvement of other antenna performances while decoupling,so metamaterial have received extensive attention in the decoupling of MIMO antennas.All the research in this paper starts from metamaterial and finally realizes three kinds of high isolation 5G MIMO antennas based on metamaterial decoupling structure.The specific research results are as follows:First,a high gain 5G MIMO antenna based on metamaterial decoupling structure is designed.This MIMO antenna aims at the decoupling mode that only realizes coupling suppression before.By arranging the newly designed single-layer double-sided metamaterial elements into a supersurface structure in a certain periodic order and placing them at a suitable position above the antenna,the isolation between MIMO antennas is improved and the antenna gain is significantly improved.Secondly,an ultra wideband 5G MIMO antenna based on metamaterial decoupling structure is designed.The MIMO antenna redesigned a single-layer double-sided "I" shaped metamaterial element for the previous low decoupling bandwidth,and placed the element under the MIMO antenna in a periodic order to form a super surface.The ultra wideband MIMO antenna ultimately loaded with a metasurface decoupling structure achieved coupling suppression in a bandwidth range of over 2 GHz.Thirdly,a circularly polarized 5G MIMO antenna based on metamaterial decoupling structure is designed.This MIMO antenna aims at decoupling only the linearly polarized antenna before.By arranging the designed "Taiji Bagua" shaped metamaterial cells in a periodic manner to form a super surface and placing it above the circularly polarized MIMO antenna,the isolation of the circularly polarized MIMO antenna within the bandwidth range is significantly improved and the 3 d B axial ratio bandwidth of the circularly polarized antenna is significantly expanded to cover the required 5G frequency band.In conclusion,the three 5G high isolation MIMO antenna designs based on metamaterial decoupling structure proposed in this paper have good performance in high gain,ultra wideband and circular polarization respectively,and have good application prospects in 5G wireless communication systems.