wantmake cureve to flat

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ljaseon
ljaseon 2021-5-12
编辑： ljaseon 2021-5-12
this code is related to the transmission line
and when i input this code i got a some figure that like this
but what the want shape is like this one
when my code forward to the ( 0,0) the shape looks like curve but what i wanna is just flat like this pitcture
how can change my code to make this picture?
this is also related to the electromagnetic and transmission line
and a/h is x axis b/h is y axis
------------------------------------------------------------------------------------------
clear all;format compact;
H=0.05;
NT= 100;
A=2.5; B=2.5; D=0.5; W=1.0;
ER=2.35;
EO=8.81E-12;
U=3.0E+8;
NX=A/H;
NY=B/H;
ND=D/H;
NW=W/H;
VD=100.0;
%CALCULATE CHARGE WITH AND WITHOUT DIELECTRIC
ERR=1.0;
for L=1:2
E1=EO;
E2=EO*ERR;
%INITIALIZATION
V=zeros(NX+2,NY+2);
%SET POTENTIAL ON INNER CONDUCTOR(FIXED NODES) EQUAL TO VD
V(2:NW+1,ND+2)=VD;
%CALCULATE POTENTIAL AT FREE NODES
P1=E1/(2*(E1+E2));
P2=E2/(2*(E1+E2));
for K=1:NT
for I=0:NX-1
for J=0:NY-1
if( (J==ND)&(I<=NW))
%do nothing
elseif(J==ND)
%IMPOSE BOUNDARY CONDITION AT THE INTERFACE
V(I+2,J+2)=0.25*(V(I+3,J+2)+V(I+1,J+2))+....
P1*V(I+2,J+3)+P2*V(I+2,J+1);
elseif(I==0)
%IMPOSE SYMMETRY CONDITION ALONG Y-AXIS
V(I+2,J+2)=(2*V(I+3,J+2)+V(I+2,J+3)+V(I+2,J+1))/4.0;
elseif(J==0)
%IMPOSE SYMMETRY CONDITION ALONG X-AXIS
V(I+2,J+2)=(V(I+3,J+2)+V(I+1,J+2)+2*V(I+2,J+3))/4.0
else
V(I+2,J+2)=(V(I+3,J+2)+V(I+1,J+2)+V(I+2,J+3)+V(I+2,J+1))/4.0;
end
end
end
%Animation of calculation
figure(1),surf(V),,colorbar,title([num2str(K),'/',num2str(NT)])
end
end

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