Research On Beidou Multi-Frequency Multi-Polarized Antenna Based On Laminated Structure

At present,China Beidou navigation system is developing rapidly.Antenna is an important part of wireless communication,and its performance directly affects communication quality and system efficiency.Facing the complex and ever-changing environment,the Beidou antenna is developing in the direction of multi-frequency,multi-polarization and miniaturization.In this paper,a circle with different radii is added to the antenna patch,which is different from the traditional chamfer circular polarization structure,which is similar to the basic theory of circular polarization in the traditional method.The circularly polarized antennas working in the single frequency bands B1,B2 and B3 of Beidou were designed respectively.After simulation test,the impedance bandwidths of each frequency band were 37 MHz,35MHz and 35 MHz respectively,and the VSWR bandwidths were 20.8MHz,20.5MHz and 18.8 respectively.The MHz and axial ratio bandwidths are 6.4 MHz,8 MHz,and 8.3 MHz,respectively.In the case where the area is constant,a plurality of antennas are stacked,and the distance between the respective radiation patches is too close,and the simulated results are offset.By adjusting the values of move1 and move2 to study the influence of the antenna,after the simulation optimization in HFSS,the impedance bandwidth of each frequency band of the antenna is 28.9MHz,22.7MHz and 5.7MHz,respectively,and the bandwidth of VSWR less than 2 in the three frequency bands is 15 MHz.At 5.1MHz and 20.3MHz,the bandwidth of AR less than 3dB in the three bands are 8 MHz,4.5 MHz and 9.3 MHz.For the B2 band,the VSWR bandwidth is narrow,and the B3 band impedance bandwidth is narrow.By opening the U-shaped slot,the antenna obtains a relatively wide bandwidth.The impedance bandwidths obtained after slotting are 30 MHz,21 MHz and 15 MHz,respectively.The slotted antennas have a standing wave ratio bandwidth of 18 MHz,11 MHz and 18 MHz,respectively.It can be seen from the results that the slotted structure effectively increases the bandwidth of the antenna.The simulation results after stacking and grooving basically meet the requirements of practical applications.