Study And Design Of Sub-6 GHz Active Integrated Antenna

The base station antenna is an important part of the mobile communication system and the development of the mobile communication system has increased its performance and integration requirements.5G Massive-MIMO technology requires smaller and more numerous antenna oscillators,and on the other hand requires lighter and simpler antenna oscillators.At the same time,interconnection losses between the antenna and the RF front-end become a challenge for system integration,requiring joint design at the device level.This thesis combined with the research project selection,based on the ring patch antenna,to explore the design of a new Sub-6 GHz base station antenna and to study the implementation of a plastic array solution with the advantages of small size,light weight,low cost and high consistency.At the same time,the key technical issues such as interconnection loss between the antenna and the RF front-end and the efficiency of the power amplifier based on the maximum output power level in the operating band are addressed,with the main work as follows:1.Study and design of a high-performance plastic array base station antenna solution.A new Sub-6 GHz base station antenna is designed,which consists of a ring radiating patch,a T-shaped feed structure and a feed port.A plastic injection molding process is used to achieve high consistency plastic vibrator base station antenna processing to reduce the weight of the antenna,and a combination of chemical plating and selective plating is used to attach the ring radiating patch and microstrip feed line to the plastic dielectric substrate,which reduces the artificial assembly welding and greatly reduces the operation and maintenance cost of the base station antenna,and is suitable for the production applications of 5G MIMO mass base station antennas.The simulation results show that the antenna covers the frequency band 2.49 GHz to 2.69 GHz with an average gain of 7.31 d Bi in the band at S11 <-10 d B,and the band can cover the 2.515 GHz to 2.675 GHz band classified by domestic mobile operators.2.Research on active integrated antenna method for co-design of power amplifier and antenna with base station antenna design.A Q matching design method is proposed in this article,and a Sub-6 GHz active integrated base station antenna is designed based on this method.The optimal output impedance of the amplifier transistor is obtained by load pulling,then the impedance Q value at the single frequency point is extracted,the Q value is obtained and the circuit model is equated and simulated jointly with the overall circuit,the Q value under this circuit model is the target antenna Q value and this Q value is used to guide the antenna design.A conventional printed dipole antenna is selected and sized so that its output impedance value meets the impedance matching requirements in the design of an active integrated antenna,which is used directly in the design of the output matching network of the amplifier transistor.Compact design and elimination of the active matching network,resulting in lower loss and higher integration of the active integrated antenna.Measurement results show that the active integrated power amplifier has a power-added efficiency(PAE)greater than 60% in the 3.4 GHz to 3.6 GHz band and an output power greater than 40 d Bm.