圆波导与同轴线课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,笫/章导和同轴线,Circular Waveguide and Coaxial Transmission Line,我们讨论了圆波导的TE波,m表示方向变化的半周期数;n-表示r方向,变化的准半周期数,另外,还应有TM波型,圆波导中TM波型,TM的最大特点是H=0,其场分量很易写出,笫/章导和同轴线,1,圆波导中TM波型,CoSo,EoJm(k。x),E。=Eo、n(k。F),sIn op,COS Ing,COS In,(k。),(17-1),JoE72,EoJm(k。r),CoSp,sIn/mop,Jos,k,E0Jn(k。r),sIn g,圆波导中TM波型,2,圆波导中TM波型,完全类似,用边界条件确定k,在r=R处,E=0,E,=0也即,(k r)=0,(17-2),设第一类 Bessel,函数m阶第n个根为,则,K R=U,(n=1,2,3,),n,即可得到,y,(17-3,圆波导中TM波型,3,圆波导中TM波型,圆波导TE波截止波数k,波型,2.405,2.62R,E,3.832,1.64R,11,5.135,1.22R,圆波导中TM波型,4,圆波导中TM波型,最后写出场方程,EJ,cosm9一,R丿sin,sInop,R)cos mgp,E=E,coSsmp-iB,R)sin mo,(17-4),H=千,osmp,R丿 sin ngp,cosm。-j,R/sin mop,H=0,圆波导中TM波型,5,圆波导与同轴线课件,6,圆波导与同轴线课件,7,圆波导与同轴线课件,8,圆波导与同轴线课件,9,圆波导与同轴线课件,10,圆波导与同轴线课件,11,圆波导与同轴线课件,12,圆波导与同轴线课件,13,圆波导与同轴线课件,14,圆波导与同轴线课件,15,圆波导与同轴线课件,16,圆波导与同轴线课件,17,圆波导与同轴线课件,18,圆波导与同轴线课件,19,圆波导与同轴线课件,20,圆波导与同轴线课件,21,圆波导与同轴线课件,22,圆波导与同轴线课件,23,圆波导与同轴线课件,24,圆波导与同轴线课件,25,圆波导与同轴线课件,26,圆波导与同轴线课件,27,圆波导与同轴线课件,28,圆波导与同轴线课件,29,圆波导与同轴线课件,30,圆波导与同轴线课件,31,圆波导与同轴线课件,32,圆波导与同轴线课件,33,圆波导与同轴线课件,34,圆波导与同轴线课件,35,圆波导与同轴线课件,36,圆波导与同轴线课件,37,圆波导与同轴线课件,38,圆波导与同轴线课件,39,圆波导与同轴线课件,40,圆波导与同轴线课件,41,圆波导与同轴线课件,42,圆波导与同轴线课件,43,圆波导与同轴线课件,44,圆波导与同轴线课件,45,圆波导与同轴线课件,46,圆波导与同轴线课件,47,圆波导与同轴线课件,48,