Research And Design Of Polarized Reconfigurable Circularly Polarized Antenna

With the exponential evolution of wireless radio wave technology,the inconsistency between more and more wireless applications and limited spectrum resources,the inconsistency between the layout and installation of wireless applications and scarce space,the relationship between communication capacity and quality,and the contradiction between the complex electromagnetic wave propagation environment have become the focus and difficulty of current antenna field scholars.In order to alleviate the contradiction mentioned above and meet the current requirements of wireless communication such as ultra wideband,low cost,easy integration,multi-function,large capacity,and high quality,a reconfigurable antenna capable of achieving multiple antenna functions has emerged.1.Introduced the current development and related technological applications of circularly polarized reconfigurable antennas,as well as the theory of circularly polarized reconfigurable antennas and broadband polarization technology,providing theoretical guidance for subsequent research.2.A circularly polarized reconfigurable antenna based on cross dipole antennas has been designed.The radiation body of the antenna is a pair of cross dipole antennas,and the circular polarization of the antenna is formed by a quarter notch ring.By switching the position of the PIN diode,the left and right circularly polarized states are changed.According to the simulation results,the effective impedance bandwidth of the antenna is 65.0%(3.32-6.52GHz),the 3dB axis specific bandwidth of the antenna is 47.0%(4.18-6.75GHz),and the peak gain within the effective bandwidth is 10.01dBi.After physical processing of the antenna,it was found that the measured data of the antenna was slightly lower than the simulation value,and the error was analyzed.3.Designed a circular slotted reconfigurable antenna based on Vshaped short circuit structure and a circular slotted reconfigurable antenna based on dual port 90 degree differential feeding.The first antenna achieved polarization state switching by changing the position of the shortcircuit structure,but the working bandwidth of the antenna was narrow.Therefore,the feeding network was changed through 90 degree differential feeding to improve the working bandwidth of the antenna.Through simulation,it was found that an external 3B bridge can improve antenna bandwidth.Based on this feature,and in order to simplify the antenna model,a bridge chip was added to the antenna model to achieve miniaturization of the antenna.