Research On Broadband High Gain Magneto-Electric Dipole Antenna

With the iterative upgrading of communication system and Internet of things equipment,the spectrum resources in low frequency band are gradually congested.Some antenna designs in the past don't meet the requirements of communication system,such as having broadband and high gain characteristics at the same time.As the complementary antenna combining current and equivalent magnetic current,the magneto-electric dipole antenna has the advantages of wide bandwidth and high gain,which is suitable for high frequency communication.This paper studies the high frequency band magneto-electric dipole antenna,and designs the following kinds of broadband and high gain magneto-electric dipole antenna:(1)A design method of M-shaped broadband magneto-electric dipole antenna is proposed.The antenna optimizes the traditional(38)-shaped feeder,and proposes a gradual stepped feeder according to the principle of microstrip transmission line,which effectively adjusts the antenna impedance matching and expands the working bandwidth.In addition,the antenna is loaded with A-slot on the rectangular radiator,which is improved to M-shaped to excite the new resonance point.Finally,by improving the patch shape and using a new feeder,the antenna achieves a relative bandwidth of 73.9%(|S₁₁|<-10d B),works in the 5.54-12.03GHz frequency band,basically covers the entire X-band,and improves the gain performance to 8.5d Bi.(2)According to the communication characteristics of Ku/K band,the magneto-electric dipole antenna based on metal through-hole structure is studied,and a design method of high gain broadband magneto-electric dipole antenna applied in Ku band is proposed.The antenna improves the linear gradual feed technology,and proposes a new type of blind through-hole structure to replace the traditional feeder terminal.Finally,the impedance bandwidth of the antenna covers9.71-21.04 GHz,and the relative bandwidth is 73.69%(|S₁₁|<-10d B).The gain is stable at about 7.5d Bi within the impedance bandwidth,and the fluctuation is only 2.5d Bi.In addition,the magneto-electric dipole antenna based on metal through-hole structure is improved,and a new periodic band gap structure is developed based on the finite-difference time-domain model theory,which effectively suppresses the excitation of antenna surface wave and improves the antenna gain performance.Finally,the working bandwidth of the antenna is moved to the K-band,which is applied in the 17.68-25.96GHz frequency band.The relative bandwidth is 37.45%(|S₁₁|<-10d B),the gain is stable at about 9.5d Bi,and the maximum radiation gain is up to 10.61d Bi,and the radiation pattern of E-plane and H-plane keeps good consistency.(3)An improved magneto-electric dipole antenna for 5G communication is proposed.The feed part of the antenna is designed as SIW structure,and its feed coupling is optimized.The rectangular narrow slot is improved to bow tie slot,so as to better feed and adjust the antenna impedance matching.Four pairs of symmetrical patches are printed on the radiation surface of the dielectric plate,and a new resonance point is excited by loading gap to broaden the impedance bandwidth.Considering the feeding cost and anti-interference ability,the microstrip to SIW linear transition structure is designed.HFSS software simulation results show that the impedance bandwidth of-10d B reflection coefficient of the antenna is 23.00-28.83GHz,and the relative bandwidth is 22.50%.The impedance bandwidth has covered the 5G communication frequency band:24.75-27.5GHz.The gain fluctuates in the range of 7.5±0.5d Bi within the working bandwidth,and the radiation patterns of E plane and H plane are basically consistent.