The incomplete radiation pattern

Hello, everyone.

I have got the x,y,z coordinates and MagE for a radiation pattern. But when I want to plot it in spherical coordinates using 'patternCustom' function, I found the pattern is incomplete.

I attaced the data and script here. Can someone help me?

[Mathieu NOE]

the function patternCustom is not provided

Answer 1

[Rangesh]

Hi Lu,

I understand that you would like to know about the incomplete appearance of the radiation pattern plot generated by the function `patternCustom`.

This is because the radiation pattern’s magnitude data is available only for a limited set of ‘phi’ and ‘theta’ angles, resulting in gaps in the plot. To obtain a complete plot, the theta and phi values should span a continuous range.

Below, I have included a sample code that demonstrates how to generate a continuous set of theta and phi values for plotting the radiation pattern.

Theta=-179:3:180;  
theta=repmat(Theta,1,60)'; % repeat along the columns 
Phi=-89:3:90; 
phi=repmat(Phi,120,1); %repeats along the rows 
phi=phi(:);  % reshapes the matrix into arrays 
I=rand(length(theta),1); % generates a random number 
patternCustom(I,theta(1:length(I)),phi(1:length(I))); 

You can refer the following links to understand the functions used:

• repmat: repeats the copies of the array in row and columns. https://www.mathworks.com/help/matlab/ref/repmat.html
• rand: generates a random scalar from the uniform distribution in the interval (0,1). https://www.mathworks.com/help/matlab/ref/rand.html
• patternCustom: plot the radiation pattern using spherical coordinates. https://www.mathworks.com/help/antenna/ref/patterncustom.html

I hope this resolves your query.

[Lu]

Thanks for your answer.