Design And Research Of MIMO Recongfigirurable Antenna

Modern wireless communication depends on the development of adaptive antenna.This has affected the antenna design of the new era to adapt to the changing RF environment.Reconfigurable antenna is such a design.Its working frequency,radiation pattern and polarization can be changed according to the requirements of users.MIMO(multiple input multiple output)has become a hot research topic,because MIMO antenna improves the channel capacity without additional power or frequency band.Of course,this requires that transceivers have many antennas,and the coupling between antennas needs to be very small.Therefore,the main design challenge of MIMO antenna is to achieve high performance while reducing the isolation between antenna elements.The integration of reconfigurable and MIMO technology can not only improve the channel width of the antenna,but also adapt to the RF environment.Therefore,the research on Frequency Reconfigurable MIMO antenna has theoretical and practical significance.This paper mainly designs three types of antennas,and the specific work can be summarized as follows:Firstly,a frequency reconfigurable dielectric antenna is designed.Through the theoretical analysis of the dielectric antenna,the dielectric antenna working in the frequency band of 5.7GHz to 5.9GHz is optimized.The hole coupling is formed through the "well" slot of the copper layer and the microstrip line at the bottom,which improves the gain of the antenna.Two pin diodes are introduced at the position corresponding to the longitudinal slot of the bottom microstrip line.By controlling the on-off of the pin diode,the feeding area is changed to realize the frequency reconfiguration of the antenna.The experimental results show that when the pin diodes are off,the center frequency of the antenna is5.8GHz,and when the pin diodes are on,the center frequency of the antenna is 5.2GHz,which realizes frequency reconfiguration.Secondly,Designed.a dual element Frequency Reconfigurable MIMO antenna.Based on the reduce coupling theory of MIMO antenna,the two antennas are placed orthogonally.The simulation and experimental results show that when the pin diodes of the dual unit MIMO antenna are disconnected,the bandwidth of the antenna is 5.75 GHz to 6GHz,and the working frequency isolation is more than 25 d B.When the pin diodes of the dual unit MIMO antenna are disconnected,the bandwidth of the antenna is 5GHz to 5.4GHz.The isolation of the working frequency band is more than 20 d B.The design of dual element reconfigurable MIMO antenna is realized.Thirdly,Designed Reconfigurable MIMO antenna include four element Frequency.Based on the dual element frequency reconfigurable antenna,according to the decoupling theory of MIMO antenna,four elements are placed ortho...