Research On Millimeter-wave Broadband Miniaturized Magnetoelectric Dipole Phased Array Antenna

The rapid development of wireless communication systems has made spectrum resources increasingly tight.Millimeter-wave antennas are an important trend for future development.The millimeter wave communication system has obvious advantages such as large working bandwidth and small occupied volume,so it has important application value in automotive radar,satellite navigation and 5G communication.The millimeter wave antenna,as a key device for transmitting and receiving electromagnetic waves,is an important part of ensuring communication quality.This paper studies the phased array technology,transmission line conversion and magnetoelectric dipole antenna theory.Abroadband miniaturized magnetic dipole phased array antenna that operates in the millimeter wave band with a stripline feed is designed.The specific research work is as follows:First,in order to meet the needs of wide-band and wide-angle scanning arrays,a solution for miniaturization of wide-band operation of magnetoelectric dipoles is proposed.A magnetoelectric dipole antenna unit working in stripline feeding in the millimeter wave band is designed.The antenna unit adopts PCB multi-layer board processing technology.The uppermost layer is a microstrip patch,the lower two layers form a strip line,and the microstrip patch has a metal via structure penetrating through the three-layer board.The uppermost microstrip patch of the antenna is equivalent to an electric dipole,and the meandering technology is used to achieve the purpose of miniaturization.On this basis,the current distribution is changed through the cut to generate a new resonance point,thereby expanding the bandwidth.The cavity formed by grounded metal vias on both sides can be equivalent to a magnetic dipole,and the height of the metal via is about a quarter wavelength,so as to ensure good directional characteristics.Secondly,in order to simulate the scanning status of the actual phased array antenna,four 1×8 scale antenna arrays with different scanning angles were designed and then processed into real objects to verify the scanning characteristics of the phased array antenna.A broadband standard waveguide-stripline switching structure and feed network are designed to meet the overall broadband characteristics of these antenna arrays.In order to realize the phase difference required by the phased array antenna,the equal-phase and unequal-phase feed networks based on the stripline are designed.The simulation results after the antenna array meet the expected goal.Comparing the simulation results with the test results,it can be found that the designed antenna array has a certain operating frequency offset in terms of standing waves,and has good beam scanning characteristics at most frequency points.Finally,the 4 × 4 scale and 8 × 8 scale millimeter wave magnetoelectric dipole phased array antennas are simulated.The results show that the array can achieve ± 60 °beam scanning on both the E and H planes.