Research On Large-scale Array Antenna-in-package Applied In 5G Millimeter Wave Communication

With the rapid development of the Internet era,the demand for wireless devices in mobile communication systems is increasing,and mobile Internet technologies represented by 5G mobile communications are ushering in unprecedented rapid development.Compared with the currently commercialized 5G Sub-6GHz mobile communications,the 5G millimeter wave frequency band has very rich spectrum resources,which can greatly increase the wireless channel capacity and achieve higher data transmission rates.It can be used for mobile communications and industrial Internet.It provides better mobile network access and has broad application prospects.Based on the above background,this article focuses on the design of 5G millimeter wave large-scale array package antennas and the electromagnetic interference measurement of high-density integrated circuits.The main research contents of this article are summarized as follows:This article starts with the antenna unit and designs a magnetoelectric dipole antenna and a differentially fed microstrip antenna that work in the 5G millimeter wave frequency band.In terms of the magnetoelectric dipole antenna,by loading a layer of parasitic radiation patch under the main radiation patch to form a coupling with the main radiation patch,an additional resonance is introduced,which broadens the low-profile magnetoelectric dipole antenna.The impedance bandwidth achieves a relative bandwidth of 46% when the height of the antenna is only 0.1?0.In terms of microstrip antennas,a differentially fed microstrip antenna is designed,and the bandwidth of the microstrip antenna is increased by using the coupling feeding method.A wide-beam microstrip antenna working at 24.25-27.5GHz is realized,the return loss under the period boundary is greater than 15 d B,and it has a stable and symmetrical pattern in the working frequency band.Based on the index requirements of active antennas and the feasibility of mass production,this paper proposes the overall architecture of the array package antenna,chip and feed network.Based on the basic one-to-two Wilkinson power splitter,and considering the overall circuit layout of the antenna,the feed network for large-scale passive and active array antennas is designed to achieve matching performance,1 point 16 power divider and 1 point 4 power divider with good amplitude and phase consistency.On the basis of the above-mentioned antenna unit and feed network,this paper designs 8×8magnetoelectric dipole antenna array and 8×16 microstrip antenna array.In terms of the magnetoelectric dipole antenna array,the wide-angle beam scanning of 0-50° is realized in the frequency band of 20-32 GHz,and the good performance of low sidelobe and low scanning gain loss is realized.For the microstrip antenna array,in order to verify the performance of the array,a passive array antenna with a fixed beam pointing was designed,processed and tested.The test results show that the passive array antenna has an echo of more than 10 d B in the 24.25?27.5GHz frequency band.Loss,3d B beam width in the horizontal plane of about 13°,and cross-polarization discrimination rate of 30 d B or more.Then the active array antenna was processed and tested,and a wide-angle high-gain beam scanning of ±60° on the horizontal plane and ±15° on the vertical plane was realized.The singlepolarized EIRP is higher than 60 d Bm,and the EVM is less than 7%.It has broadband,high gain and wide Angle scanning performance.In the electromagnetic interference measurement of high-density integrated circuits,this paper designs,processes and tests a near-field magnetic field probe with a differential loop and electric field shielding vias.A method of applying a differential dual-loop structure to reduce the interference of electric field components,thereby improving the electric field rejection ratio of the probe is proposed.The electric field rejection ratio of the differential probe is greater than 30 d B in the frequency range up to 0.1?12.9GHz.The comparison with the two reference probes shows that the design of the differential loop and the shielded through-hole can significantly improve the electric field suppression performance and the sensitivity of the magnetic field response of the magnetic field probe,while maintaining the good spatial resolution of the probe.The probe is suitable for more accurate magnetic field measurement in the electromagnetic interference test of integrated package circuit.