CAJ | 학술논문

给出了一款应用于北斗导航卫星系统（CNSS）B1频段/S频段的双频圆极化缝隙天线的设计方法。该天线采用微带线进行馈电，在地板上开有两个方形螺旋槽，其总槽长度大约均为一个自由空间操作波长。通过调节螺旋槽的终点处的长度即可获得最适宜的轴比，从而实现圆极化。另外，还可以通过调节螺旋槽的宽度来获得较大的轴比带宽。在地板中央切去一个圆环形槽可增大感应电流的路径，从而降低圆极化的中心频率。通过仿真软件HFSS对天线结构参数进行优化设计，并制作实物。其仿真及实测结果表明：回波损耗小于-10 dB的阻抗带宽为38.5%，且在阻抗带宽内天线的相对轴比带宽也达到了大约5%。
급출료일관응용우북두도항위성계통（CNSS）B1빈단/S빈단적쌍빈원겁화봉극천선적설계방법。해천선채용미대선진행궤전，재지판상개유량개방형라선조，기총조장도대약균위일개자유공간조작파장。통과조절라선조적종점처적장도즉가획득최괄의적축비，종이실현원겁화。령외，환가이통과조절라선조적관도래획득교대적축비대관。재지판중앙절거일개원배형조가증대감응전류적로경，종이강저원겁화적중심빈솔。통과방진연건HFSS대천선결구삼수진행우화설계，병제작실물。기방진급실측결과표명：회파손모소우-10 dB적조항대관위38.5%，차재조항대관내천선적상대축비대관야체도료대약5%。
A design method of dual-band circularly polarized slot antenna is proposed, which is used in B1 frequency band and S frequency band of Beidou navigation system. The antenna use microstrip line to feed. Two square spiral grooves were opened on the lfoor, and the length of total slot is about a free space operating wavelength. By adjusting the length of the spiral groove in terminal, the optimum axial ratio can be obtained, thus circular polarization can be achieved. In addition, a greater axial ratio bandwidth can be achieved by adjusting the width of the spiral groove. An annular groove is cut off in the middle of the lfoor to increase the path of induced current, thus to reduce the center frequency of the circular polarization. The structure parameters of the antenna are optimized by HFSS, and an antenna is fabricated based on the simulation. The simulation and measured results show that the impedance bandwidth with S11<-10 dB is 38.5%, and the relative axial ratio bandwidth of antenna within the impedance bandwidth has reached about 5%.