ElectroHolography Laboratory

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===== Phased Array Output =====

Irradiance Distribution of parallel emitters.  Phase control allows for focusing of light to specific points.  Output of simulation shown:{{ :playground:irradiancedistribution.png?500 |}}
Code can be found at ../groups/Fresnel_Simulation/

---------

Code for simulation of far-field (beyond 1 lambda) output of phased array:
-----
	clc; clear all;
	close all;
        
	N    = 10;		 % Number of Outputs
	alfa = -90:0.1:90;       % Zenith angle
	d_l  = [0.1,0.5,1,2,5] ; % Distance between outputs/wavelength of output light
        
	for i = 1:5 % Graphing several ratios of d_l
	    Ed = abs(sin(N*pi*d_l(i)*sind(alfa))./sin(pi*d_l(i)*sind(alfa)))/N;
	    fig = figure(i);
	    set(fig,'Position', [100, 100, 1049, 400]);
	    subplot(2,2,[1 3]);
	    plot(alfa,Ed);
	    grid on;
	    axis([-90 90 0 1]);
	    xlabel('Zenith angle [deg]');
	    ylabel('Normalized radiation pattern');
	    title(['Ratio between distance and wavelength d/\lambda = ',num2str(d_l(i))]);
                
	    subplot(2,2,[2 4]);
	    polar(alfa*pi/180,Ed);
	    hold on;
	    polar((alfa+180)*pi/180,Ed);
	    xlabel(['Polar plot for the radiation pattern d/\lambda = ',num2str(d_l(i))]);
	    hold off;
	end

-----
Code for simulation of deflected far-field (beyond 1 lambda) output of phased array:
-----
	clc;clear all;
	N = 10; % Number of Outputs
	d_l = 0.5; % Distance between outputs/wavelength of output light
	alfa0 = 50; % Deflection angle
	alfa = -180:0.1:180;
	Ed = abs(sin(pi*d_l*N*(sind(alfa) - sind(alfa0) ))./... % Deflected Output
	     sin(pi*d_l*(sind(alfa) - sind(alfa0))))/N; 
	Ed0 = abs(sin(pi*d_l*N*(sind(alfa)))./... % Normal Output
	      sin(pi*d_l*sind(alfa)))/N; 
	Edl = 20*log10(Ed); % Convert to Output power
	Edl0= 20*log10(Ed0); % Convert to Output power
	    fig = figure(16);					 % Graphing simulation
	    set(fig,'Position', [100, 100, 1049, 400]);
	    subplot(2,2,[1 3]);
	    plot(alfa,Ed);
	    hold on;
	    plot(alfa,Ed0,'r');
	    grid on;
	    axis([-90 90 0 1]);
	    xlabel('Zenith angle [deg]');
	    ylabel('Normalized array factor,Radiation pattern');
	    title(['Number of elements = ',num2str(N),', d/\lambda = 0.5']);
	    legend('\beta = -15 deg','\beta = 0 deg','Location','NorthWest')
	    subplot(2,2,[2 4]);
	    polar(alfa*pi/180,Ed);
	    hold on;
	    polar(alfa*pi/180,Ed0,'r');
	    hold on;
	    xlabel('Polar plot for the radiation pattern');
	    hold off;
	    figure(17);
	    plot(alfa,Edl);
	    hold on;
	    plot(alfa,Edl0,'r');
	    grid on;
	    legend('\beta = 30 deg','\beta = 0 deg','Location','NorthWest')
	    axis([-90 90 -100 0]);
	    xlabel('Zenith angle [deg]');
	    ylabel('Radiation pattern dB');
	    title(['Number of elements = ',num2str(N),', d/\lambda = 0.5']);

-------

This code was modified from the code listed at this site [[http://smallsats.org/2013/05/13/phased-array-antenna-radiation-pattern-and-array-configuration/]] Examples of outputs can be found there.
ElectroHolography Laboratory

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