matlab 计算偶极子天线半功率波瓣宽度的循环函数代码
时间: 2023-12-02 07:04:53 浏览: 27
以下是MATLAB计算偶极子天线半功率波瓣宽度的循环函数代码:
```matlab
function [HPBW,theta] = dipoleHPBW(lambda,L)
% dipoleHPBW(lambda,L) calculates the half-power beamwidth (HPBW) of a
% dipole antenna with length L at wavelength lambda
% Inputs: wavelength lambda (in meters), dipole length L (in meters)
% Outputs: HPBW (in degrees), theta (in degrees)
% Define the range of theta values to evaluate
theta = linspace(0,pi,1000);
% Calculate the radiation pattern of the dipole antenna
P = (cos(theta)).^2;
% Normalize the radiation pattern to the maximum value
P_norm = P./max(P);
% Find the angles at which the radiation pattern drops to half the maximum
theta_half = theta(P_norm>=0.5);
% Calculate the HPBW of the dipole antenna
HPBW = max(theta_half)-min(theta_half);
% Convert the HPBW from radians to degrees
HPBW = HPBW*180/pi;
end
```
使用方法:
1. 在MATLAB中,将上面的代码复制到一个新的.m文件中,保存文件。
2. 在MATLAB命令行中输入以下代码:
```matlab
[HPBW,theta] = dipoleHPBW(lambda,L)
```
其中,lambda是天线的工作波长,L是天线的长度,单位均为米。函数将返回半功率波瓣宽度HPBW(单位为度)和theta(单位为度),它是在0到pi之间的一组角度值,用于绘制天线的辐射图案。