Antenna Design With Low Profile And Broadband For 5G Communication

At present,in the traditional 2G/3G/LTE spectrum,the congestion of the spectrum become more serious,the development of 5G spectrum resources is the trend of the times.Therefore,the research of high performance antenna for the 5G mobile communication has the extensive value and practical significance.In 5G communication system,a single antenna is not enough to support the high rate wireless communication,two kinds of base station antenna technology,Massive Multiple Input Multiple Output(Massive MIMO)and Millimeter Wave technology(mmWave)have attracted much attention.On the one hand,the massive MIMO antenna system has a large number of antenna units,sophisticated control circuit,high integration density and limited space for the antenna,which makes the design of single antenna with low profile miniaturization particularly important.On the other hand,on November 22,2019,the World Radiocommunication Conference 2019(WRC-19)was held in sharm el-sheikh,Egypt,where the mm Wave frequency band for 5G networks was finalized at 24.25-27.5GHz,37-43.5GHz,45.5-47 GHz,47.2-48.2 and 66-71 GHz.Millimeter wave communication system construction has been put on the agenda,millimeter wave antenna design is urgently needed.According to the above trends,three kinds of antennas are designed.In the first,an integrated magnetoelectric(ME)dipole antenna based on supersurface is designed to meet the requirements of multi-frequency broadband and low profile of the antenna.The traditional ME dipole antenna has the excellent performance of high front to back ratio(FBR),wide bandwidth and high gain,but it is often complicated in structure,difficult to make and high in profile.As a result,the antenna was redesigned to make the ME dipole easier to make by using substrate integration technology.By using the stepped slot structure,the antenna produces several resonant points close to each other,thus producing wide bandwidth.The second one is to design a conformal MIMO antenna system composed of three ME dipole antennas to expand the coverage of the antenna.By redesigning a single ME dipole,a main dipole and a pair of minor dipoles were combined to form an antenna unit to achieve dual-band radiation.The antenna adopts conformal geometry structure for easy installation on the cylinder,and has a wide beamwidth on the H-plane of the antenna.The third one is to design a compact wideband circularly polarized ME dipole antenna array for the wideband demand of millimeter wave antenna.At the same time,the transition structure of a new type of substrate integrated waveguide(SIW)to coaxial line is proposed to connect the coaxial-fed ME dipole with the SIW feeding network.Based on this transition,a novel one to four way power divider with broadband characteristic is proposed.Wider axial ratio(AR)bandwidth and 3dB gain bandwidth are achieved through SIW sequential rotation(SR)feed network.Based on the above research,the 5G antenna theory with wide bandwidth,low profile and high gain and the millimeter wave antenna design theory are explored to help the development of 5G communication.