wavesignalelectronics_国科大微波代码_matlabGUI_源码

利用方程求解不同的x,y与b的关系，画图分析空间电荷力QC如何影响增益和衰减 teacher luo常用代码 clear all clc syms z QC=[0.28,0.51,1.03]; for l=1:3 b=-4:0.1:4; for j=1:81 c=solve((-4*QC(l)-(z^2)+1/(i*(z)-b(j)+i*0)),z); x=real(c); y=imag(c); x1=vpa(x); y1=vpa(y); d(j)=x1(1); e(j)=y1(1); f(j)=x1(2); g(j)=y1(2); R(j)=x1(3); h(j)=y1(3); end xi(l,:)=d; yi(l,:)=e; xi1(l,:)=f; yi1(l,:)=g; yi2(l,:)=h; xi2(l,:)=R; end figure(1) for l=1:3 subplot(1,3,l) plot(-4:0.1:4,xi(l,:),'b',-4:0.1:4,yi(l,:),'r',-4:0.1:4,xi1(l,:),'g',-4:0.1:4,yi1(l,:),'y',-4:0.1:4,yi2(l,:),'m',-4:0.1:4,xi2(l,:),'c') line([0 0],[-4 4],'linestyle',':') line([-4 4],[0 0],'linestyle',':') xlabel('速度参量 b') ylabel('x or y') legend('x2','y2','x3','y3','y1','x1') axis([-4,4,-4,4]) end