clc;
clear all
clf;
tic; %计时
lambda=1;
N=31;a=0.0000001;%已知天线和半径
ii=1;
h=0.5;
L=h*lambda;
len=L/N;%将线分成奇数段,注意首末两端的电流为0
e0=8.854e-012;u0=4*pi*10^(-7);k=2*pi/lambda;
c=3e+008;w=2*pi*c;%光速,角频率
ata=sqrt(u0/e0);
z(1)=-L/2+len/2;
for n=2:N
z(n)=z(n-1)+len;
end
for m=1:N
for n=1:N
if (m==n)
p(m,n)=log(len/a)/(2*pi)-j*k*len/4/pi;
else
r(m,n)=sqrt((z(m)-z(n))^2+a^2);
p(m,n)=len*exp(-j*k*r(m,n))/(4*pi*r(m,n));
end
end
end
for m=1:N
q(m)=cos(k*z(m));
s(m)=sin(k*z(m));
t(m)=sin(k*abs(z(m)))/(j*2*ata);
end
pp=p(N+1:N^2-N);
pp=reshape(pp,N,N-2);
mat=[pp,q',s'];%构造矩阵
I=mat\t';
II=[0;I(1:N-2);0];%加上两端零电流
Current=abs(II);
x=linspace(-L/2,L/2,N);
figure(1);
string=['b','g','r','y','c','k','m','r'];
string1=['ko','bo','yo','co','mo','ro','go','bo'];
plot(x,Current,string(ii),'linewidth',1.3);
xlabel('L/\lambda'),ylabel('电流分布');
grid on
hold on
%legend('L=0.1\lambda','L=0.2\lambda','L=0.3\lambda','L=0.4\lambda','L=0.5\lambda','L=0.6\lambda','L=0.7\lambda','L=0.8\lambda','L=0.9\lambda','L=1\lambda')
legend('L=0.1\lambda','L=0.3\lambda','L=0.5\lambda','L=0.7\lambda','L=0.9\lambda','L=1.1\lambda','L=1.3\lambda','L=1.5\lambda')
Zmn=1/I((N+1)/2);%%%%%%V=1v
theta=linspace(0,2*pi,360);
for m=1:360
for n=1:N
F1(m,n)=II(n).*exp(j*k*z(n)*cos(m*pi/180))*len*sin(m*pi/180);
end
end
F2=-sum(F1');
F=F2/max(F2);%%%归一化
figure(2);
polar(theta,abs(F),string(ii));
title('E面归一化方向图')
view(90,-90)
%legend('L=h\lambda','L=0.3\lambda','L=0.3\lambda','L=0.4\lambda','L=0.5\lambda','L=0.6\lambda','L=0.7\lambda','L=0.8\lambda','L=0.9\lambda','L=1\lambda')
legend('L=0.1\lambda','L=0.3\lambda','L=0.5\lambda','L=0.7\lambda','L=0.9\lambda','L=1.1\lambda','L=1.3\lambda','L=1.5\lambda')
hold on
figure(3)
kk=1;
for phi=0:pi/180:2*pi
for n=1:N
FF(n)=II(n)*len*exp(i*k*len*n*cos(pi/2))*sin(pi/2);
end;
FFF(kk)=sum(FF);
kk=kk+1;
end;
phi=0:pi/180:2*pi;
polar(phi,FFF/max(abs(FFF)),string(ii));title('不同L/\lambda H-plane pattern,F({\theta},{\phi}),\theta=90');
legend('L=0.1\lambda','L=0.3\lambda','L=0.5\lambda','L=0.7\lambda','L=0.9\lambda','L=1.1\lambda','L=1.3\lambda','L=1.5\lambda')
hold on
figure(4)
polar(phi,FFF/max((FFF)),string(ii));title('归一化H-plane pattern,F({\theta},{\phi}),\theta=90');
hold on
figure(5)
mm=1;
for theta=0:0.01*pi:pi;
for n=1:N
E(1,n)=2*pi*c*u0*len/(4*pi*1)*(exp(-i*k*1)*exp(i*k*len*n*cos(theta))*sin(theta));
end
EE=E*II;
G(mm)=(4*pi*1^2)/ata/abs(II((N-1)/2+1))^2/(-real(Zmn))*abs(EE)^2;
mm=mm+1;
end
评论3