Research On Key Technologies Of Millimeter Wave Antennas In Mobile Communication

With the rapid development of wireless communication technology,4G wireless communication systems are being widely deployed around the world.However,the amount of data transmitted by the communication system are growing exponentially.The 4G technology has just about reached the theoretical limit of data rate.It is not sufficient to accommodate the challenges such as spectrum crisis,data volume and other challenges.Therefore,the research on the next generation of the mobile communication technology has become an important topic for the majority of scholars and engineers.As for the research on5G mobile communication technology,it has been transformed into a comprehensive and in-depth research stage.At current stage,the research on 5G mobile communication mainly includes five major technologies:Millimeter wave?mmWave?,Massive MIMO,Full Duplex,Beamforming,and Small Base Station.With the high speed of mobile data traffic,the radio frequency spectrum in the low-frequency band below 3 GHz can no longer be satisfied.However,there still exist vast amounts idle spectrum in the mmWave band ranging from 20 GHz to 300 GHz.In addition,the antenna operating in this frequency band has a small size,and its communication system spectrum utilization and throughput is greater than the current wireless system.The mmWave technology is one of the most effective solutions to solve difficulties faced by the current 4G communication technologies.Therefore,the mmWave antenna in mobile communication systems are the key research subject of this paper.The proposed antennas in this paper are operating at the frequency band around 28GHz,which is the most used band studied in the world.1.Several millimeter wave antennas have been designed for different application environments and requirements.The order can be listed as:the dual-beam microstrip patch antenna,the wide-band mmWave dual-beam back-cavity patch antenna,the wide-band frequency scanning back-cavity patch antenna and the mmWave back-cavity patch antenna with pattern stability.These designed antenna uses the high-orderTM₂₀ mode and the loading short-circuit pin technologies to achieve the desired performance.These antennas have higher gain and wider band,which can meet the different requirements of the future5G mobile communication networks.2.According to the requirements of the future 5G mobile terminals,an mmWave dipole antenna array and a 4?4 SIW Butler matrix are designed.The antenna array fed by the designed Butler matrix can radiate four slanted beams and achieve multi-beam radiation performance.The proposed antenna system operates at the 28 GHz mmWave band of 5G mobile communication technology planned in China.The antenna system has the characteristics of small size,low profile,and easy fabrication.The antenna system also has better performanceand is suitable for integration into mobile communication terminals.3.The millimeter wave antenna array in the small base station of the future 5G mobile communication system is studied in this article.A dual-polarization millimeter wave back cavity patch antenna unit is designed and simulated by understanding the current research status and researching on Massive MIMO antenna.And the simulation,research and processing test of the 1?4 subarray are also carried out in this paper.At the same time,the coupling analysis of the 2?2 subarrays,and the measurement analysis of the column-shaped millimeter-wave Massive MIMO antenna arrays have also been realized.The analysis proves that the antenna array is very suitable for the construction of small base stations in 5G communication system.