Design Of Magneto-Electric Dipole Shared-Aperture Antenna Based On SIW Feed

With the continuous development of modern communication technology,5G millimeterwave communication has gradually entered people’s vision due to wide bandwidth,strong anti-interference ability and easy integration of devices.It can play an important role in emerging fields such as telemedicine and autonomous driving.With the continuous increase of communication frequency bands,the size of antenna occupancy largely restricts its application scenarios,and the common-aperture antenna can effectively solve the problem of large antenna occupancy.This paper focuses on the application of dual-band communication,and studies the design of 5G millimeter-wave antenna and shared-aperture antenna.The main work includes the following parts:Firstly,a single-polarized magneto-electric dipole antenna based on SIW feed and SIW cavity-backed is designed.The antenna designed based on SIW feed technology can effectively reduce the energy leakage generated by the feed part of the antenna.By loading metallized via around the antenna to form an SIW cavity-backed,the gain in the 27GHz29GHz frequency band can be increased by more than 1dB.At the same time,the conversion structure of SIW and coaxial line is designed so that the antenna can be easily processed and tested.Finally,The antenna can not only effectively cover the 24.25GHz-29.5GHz frequency band,but also has good radiation patterns.Afterward,a dual-polarized magneto-electric dipole antenna based on SIW feeding is designed.After optimizing the connection and chamfering of the metal patch,the impedance matching of the antenna is significantly improved.The parameters of the metal patch and four metallized through holes are optimized,so that the reflection coefficient of the antenna is always kept below-10dB in the frequency band.The reflection coefficient of the final designed dual-polarized antenna is lower than10dB in the frequency band of 24.25GHz-29.5GHz,-the isolation of the two ports is greater than 10dB,and it has a good radiation pattern in the frequency band.Secondly,a dual-polarized patch antenna with band-pass filtering characteristics is designed based on FSS technology.Firstly,an FSS unit with band-pass filtering characteristics is designed.By optimizing the FSS unit parameters,the transmission coefficient is greater than-1dB in the frequency band of 24.75GHz-27.5GHz.Then,a dual-polarized patch antenna loaded with open-circuit stepped impedance resonator is designed based on the designed FSS unit.The out-of-band suppression of the antenna is significantly improved after loading the open-circuit stepped impedance resonator.Finally,the antenna can work in 9.5GHz10.5GHz band,the isolation is greater than 13dB and has a good pattern.Then,based on the previously designed dual-polarized magneto-electric dipole antenna and dual-polarized patch antenna,a magneto-electric dipole shared aperture antenna fed by SIW is designed.The low-frequency part of the shared-aperture antenna is the dual-polarized patch antenna based on FSS technology,which is located directly above the dual-polarized magnetic dipole antenna fed by SIW as the high-frequency part.It can work in 9.5GHz-10.5GHz and 24.75GHz-27.5GHz bands,and has good radiation pattern in both bands.The isolation of the antenna is more than 12dB in 9.5GHz-10.5GHz and 24.75GHz-27.5GHz bands.