无人机双频宽带圆极化缝隙天线OA

A dual-band circularly polarized slot antenna based on defect ground structure is proposed to meet the demand for multi-band and circular polarization in UAV communication.The 2.4 GHz and 5.0 GHz band radiation can be achieved by adjusting the size of the L-shaped radiator.Defect design is carried out on the floor,and the radiator is coupled with a box-shaped floor to effectively broaden the impedance bandwidth(IBW)of the antenna.Two rectangular patches of different sizes are added to the diagonal of the floor to achieve dual band circularly polarized radiation.The floor is chamfered to expand the 2.4 GHz frequency band axial ratio bandwidth(ARBW),and a circular hole is opened in the upper left corner of the floor to further expand the 5.0 GHz frequency band ARBW.The edge of the floor is slotted to further reduce the antenna size and expand the impedance bandwidth(IBW).The optimal optimized size is 60.5 mm×60.5 mm×0.8 mm.The measurement results show that the IBW of the antenna is 2.12～3.47 GHz,its 3 dB circularly polarized ARBW is 2.27～2.91 GHz,and its peak gains are 2.65 dBi and 2.73 dBi,respectively.This UAV antenna has the advantages of simple structure,small size,and low profile.