Research On Wideband Low Profile Dual Microstrip Antenna For 5G Communication System

Wireless communication technology has been extremely rapid development,the world attaches great importance to the development of 5G communication,the rapid development of communication technology on channel capacity and link reliability put forward higher requirements.Antenna as an important part of wireless communication,the design of antennas with higher integration,larger channel capacity,and wider bandwidth has become a research hotspot.In the last few years,the broadband antenna and low-profile antenna with periodic structure has attracted considerable attention.In 2021,Professor Z.N.Chen proposed a dual-polarization antenna based on periodic structure,achieving 0.058λ₀ profile height and 25%impedance bandwidth.In the same year,the dual-polarization antenna proposed by S.X.Ta achieved 0.078λ₀ profile height and 28.4%working bandwidth.This antenna has some advantages,but there is the problem of band width.They cannot meet the bandwith requirements of 5G systems.This paper,aiming at 5G communication frequency band（3.30～3.60GHz、4.8～5.0GHz）and 5G WiFi（5.150～5.875GHz）,two dual-polarization antennas are designed.The main content of the article:（1）A broadband low-profile dual-polarization antenna applied in the band of 5G communication system is proposed.The antenna adopts a single layer radiation structure and achieves a low-profile characteristic of 0.047λ₀.The radiative patches are arranged symmetrically in the center to expand the antenna bandwidth while keeping the gain stable.The test results show that the relative bandwidth of-10d B of the two polarization antennas reaches 50.7%,the impedance bandwidth effectively covers3.12GHz to 5.24GHz,the average gain is 7.53d Bi,the isolation degree of the two ports is better than 30d B,and the radiation in the working band is stable,which is suitable for 5G mobile communication system.（2）A broadband dual-polarization antenna covering a 5G communication system and 5G WiFi is proposed.The antenna has a double-layer radiation structure.Double layer structure consists of four rhomboid patches and 24 rectangular patches.The loading of the periodic structure in the upper layer is beneficial to the improvement of impedance matching and gain.Test results show that the tow-port-10d B impedance bandwidth covers 3.300GHz to 6.078GHz,with an average gain of 9.43d Bi in the operating band.The antenna can cover 5G communication bands of 3.30GHz to3.60GHz and 4.80GHz to 5.00GHz,as well as 5G WiFi bands of 5.150GHz to5.875GHz.