您正在关注此问题

您将在关注的内容源中看到更新。
您可能会收到电子邮件，具体取决于您的通信预设项。

How to calculate array factor in matlab

3 次查看（过去 30 天）

显示更早的评论

FARHA KHAN 2021-12-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab

⋮

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab

编辑： Walter Roberson 2021-12-24

Untitled.png

I m trying to write matlab code for this expression.

Can anyone help me with this?

Thanks!!!!

11 个评论
显示 9更早的评论隐藏 9更早的评论

Rik 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901240

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901240

What have you tried so far? This doesn't look like it should be too complicated to write.

Note that the subscripts are very hard to read in your image.

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901265

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901265

编辑：Rik 2021-12-23

在 MATLAB Online 中打开

I have tried this: Here there are two rings 1st ring 4ele and 2nd ring ring 16ele. subscripts for first summation:m=1:M (here M=1,2) subscripts for second summation:Nm (here Nm=4,16) i.e when m=1 Nm=4 and when m=2 Nm=16.

I hope you undersood this .

I am not getting the result. help me @Rik

AF(1,1)= 0;n=[4 16]; %no of ele
phi1=[90:90:360 zeros(1,12); 22.5:22.5:360]
l=[1 4] %mode
r=[0.5 2.5]*lambda %radii of each ring
k=(2*pi)/(lambda);
phio=0;
phi=0;
theta=0;
for m=1:2  
    for i=1:n(m)
        AF= AF + (exp((1j).*(((k)*(r(m))*(sin(deg2rad(theta)))*(cos((deg2rad(phi))-(deg2rad(phi1(m,i))))) + ((l(m))*((-k)*r(m)*cos((deg2rad(phio))-(deg2rad(phi1(m,i))))))))));
    end
    AFk=abs(AF);
end

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901270

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901270

I am getting the output @Rik. as 9.741 .

I want to know this program is right?As I am not getting required output which should be zero.

Rik 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901315

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901315

I can't properly read you function, so I can't absolutely confirm you did it correctly.

The main advice I have for you is to split your calculation into several parts you can more easily read. One main thing would be to move the calls to deg2rad outside the loop.

If you post a clearer version of your mathematical notation I can try to help you check if this is correct.

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901335

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901335

Can you see this @Rik

Rik 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901390

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901390

在 MATLAB Online 中打开

Yes, this I can read.

I would convert this to Matlab as follows:

lambda=__;
M=2;
N=[4 16];
K=(2*pi)/lambda;
r=[0.5 2.5]*lambda;
theta=0;
phi=[90:90:360 zeros(1,12); ...
    22.5:22.5:360];
phi_=0;
alpha=__;
s=0;
for m=1:M
    for n=1:N(m)
        tmp=K * r(m) * sin(theta) * cos(phi_-phi(m,n)) + alpha(m,n);
        s=s + W(m) * exp(1j*tmp);
    end
end

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901395

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901395

alpha(m,n)=-k*r(m)*cos(phi0-phi(m,n)) @Rik

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901410

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901410

编辑：Walter Roberson 2021-12-24

在 MATLAB Online 中打开

intializing s as?

M=2
for m=1:M
    for n=1:n(m)
        tmp=(k * r(m) * sin(theta) * cos(phio-phi(m,n))) - (k * r(m) * cos(phio-phi(m,n)));
        s=s + W(m) * exp(1j*tmp);
    end
end

@rik

FARHA KHAN 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901450

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901450

tq it was bit helpful @Rik

Rik 2021-12-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901475

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1616410-how-to-calculate-array-factor-in-matlab#comment_1901475

在 MATLAB Online 中打开

You could also calculate alpha in your loop:

s=0;
for m=1:M
    for n=1:N(m)
        alpha=-K*r(m)*cos(phi0-phi(m,n));
        tmp=K * r(m) * sin(theta) * cos(phi0-phi(m,n)) + alpha;
        s=s + W(m) * exp(1j*tmp);
    end
end