ANTENNA PHYSICAL CHARACTERISTICS USING MATLAB

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DIPOLE & RECTANGULAR APERTURE ANTENNA

This sample assignments shows Dipole & Rectangular Aperture antenna pattern

by

Salaheddin

Hosseinzadeh

3D Polar plot for various Dipole and Rectangular Aperture antennas.

Dipole_Aperture_Aid(varargin)

function varargout = Dipole_Aperture_Aid(varargin) % DIPOLE_APERTURE_AID M-file for Dipole_Aperture_Aid.fig % DIPOLE_APERTURE_AID, by itself, creates a new DIPOLE_APERTURE_AID or raises the existing % singleton*. % % H = DIPOLE_APERTURE_AID returns the handle to a new DIPOLE_APERTURE_AID or the handle to % the existing singleton*. % % DIPOLE_APERTURE_AID('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in DIPOLE_APERTURE_AID.M with the given input arguments. % % DIPOLE_APERTURE_AID('Property','Value',...) creates a new DIPOLE_APERTURE_AID or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before Dipole_Aperture_Aid_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to Dipole_Aperture_Aid_OpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES % Edit the above text to modify the response to help Dipole_Aperture_Aid % Last Modified by GUIDE v2.5 30-Dec-2010 21:53:47

% Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Dipole_Aperture_Aid_OpeningFcn, ... 'gui_OutputFcn', @Dipole_Aperture_Aid_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end % End initialization code - DO NOT EDIT % --- Executes just before Dipole_Aperture_Aid is made visible. function Dipole_Aperture_Aid_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to Dipole_Aperture_Aid (see VARARGIN) %%__________________________________________________________________ %%____________________Start of the Program__________________________ %%__________________________________________________________________ %Variable Definition Specially Global and Preset ones % Some values have default values so that it could be sketch by a single % click global PhiMax; PhiMax = 2*pi; % set default Phi global ThetaMax; ThetaMax = pi; % set default Theta global dimension; dimension = 50; %set default dimension global Length Length=1; % set default Length % Choose default command line output for Dipole_Aperture_Aid handles.output = hObject;

% Update handles structure guidata(hObject, handles); % UIWAIT makes Dipole_Aperture_Aid wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = Dipole_Aperture_Aid_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Get default command line output from handles structure varargout{1} = handles.output; % --- Executes on selection change in popupmenu1. function popupmenu1_Callback(hObject, eventdata, handles) % hObject handle to popupmenu1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: contents = get(hObject,'String') returns popupmenu1 contents as cell array % contents{get(hObject,'Value')} returns selected item from popupmenu1 %%____________________ Gather user information for Phi range global PhiMax content = get(hObject,'Value'); switch content case 1 PhiMax=2*pi; PhiMax case 2 PhiMax=1.5*pi; PhiMax case 3 PhiMax=pi; PhiMax case 4 PhiMax=.5*pi; PhiMax otherwise disp('input wrong'); %% Otherwise condition will never happend end

% --- Executes during object creation, after setting all properties. function popupmenu1_CreateFcn(hObject, eventdata, handles) % hObject handle to popupmenu1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: popupmenu controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end % --- Executes on selection change in popupmenu2. function popupmenu2_Callback(hObject, eventdata, handles) % hObject handle to popupmenu2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: contents = get(hObject,'String') returns popupmenu2 contents as cell array % contents{get(hObject,'Value')} returns selected item from popupmenu2 %%____________ Gather user information for Theta ____________________ global ThetaMax content = get(hObject,'Value'); % returned value is Theta angle , stored in content switch content case 1 ThetaMax=pi; ThetaMax case 2 ThetaMax=.75*pi; ThetaMax case 3 ThetaMax=.5*pi; ThetaMax otherwise disp('Non Above , actually this condition will never ever happen') end % --- Executes during object creation, after setting all properties. function popupmenu2_CreateFcn(hObject, eventdata, handles) % hObject handle to popupmenu2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: popupmenu controls usually have a white background on Windows. % See ISPC and COMPUTER.

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end function edit1_Callback(hObject, eventdata, handles) % hObject handle to edit1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit1 as text % str2double(get(hObject,'String')) returns contents of edit1 as a double %%____________ Returns the dimension of phi & theta matrix assigned by user global dimension dimension=str2double(get(hObject,'String')); dimension=floor(dimension); % as floats arent accepted dimension floored for example %if dimension ( announced as Quality ) = 112.5 it's gonna turn into 112 % --- Executes during object creation, after setting all properties. function edit1_CreateFcn(hObject, eventdata, handles) % hObject handle to edit1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) %%_____________ Data Generation Button & its duties listed below________________ %%__ 1_Validating Dimension ( Zero,NaN,Inf ) gonna be amende, if necessery global ThetaMax global PhiMax global dimension global phi global theta

if (dimension == 0) % IF . gonna check the dimension validity dimension=50 disp('Zero precision is not accepted , its set to default of 50') %dimension %to display the value elseif(isnan(dimension)==1) disp('NaN Dimension is not accepted , its set to default of 50') dimension= 50 elseif(isinf(dimension)==1) disp('Infinite Dimension is not accepted , its set ot default of 50') dimension=50 elseif(dimension < 0) disp('Negative precision is not accepted , its set to default of 50') dimension=50 elseif(dimension < 40) disp('!This precision is not recommended!, it`d better increase it.') end phi= linspace(0,PhiMax,dimension); %%% Generating phi & theta related to theta= linspace(0,ThetaMax,dimension); %% user input %%_ This condition is jut to make 100 % sure , or else this will not happend if(size(phi)==size(theta)) disp('Data Generation Successful') else disp('Data Generation Failed , Try Again This messege will never shows up , unless you do some magic , LOL') end function edit2_Callback(hObject, eventdata, handles) % hObject handle to edit2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit2 as text % str2double(get(hObject,'String')) returns contents of edit2 as a double %%___________ Requesting and validating Antenna Length ___________________ global Length Length=str2double(get(hObject,'String')); %global Length if(isnan(Length)== 1 ) % Length validity disp('Attention!! Length is NaN') disp('This will illustrate infinitesimal Dipole Pattern!') Length = eps

elseif( isinf(Length)== 1) disp('Attention!! Length is Infinite') disp('This will illustrate Infinite Dipole Pattern!') Length = Inf elseif(Length == 0) disp('Length is Zero') disp('This will illustrate infinitesimal Dipole Pattern') Length = eps elseif(Length == -1) disp('Attention!! Length is MINUS !! Length changed to default value 1') length=1 end %length=str2num(Length); % --- Executes during object creation, after setting all properties. function edit2_CreateFcn(hObject, eventdata, handles) % hObject handle to edit2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'),... get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end % --- Executes on button press in pushbutton2. function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) %___________________ sketch useing Mesh _____________________ global phi global theta global Length global R global x global y global z [THETA,PHI]=meshgrid(theta,phi); R=abs((cos(pi.*Length.*cos(THETA))- cos(pi.*Length))./(sin(THETA))); x=R.*sin(THETA).*cos(PHI); y=R.*sin(THETA).*sin(PHI);

z=R.*cos(THETA); %figure mesh(x,y,z); %clear all set(gca,'PlotBoxAspectRatio',[1,1,1]) axis equal; xlabel('Axis X'); ylabel('Axis Y'); zlabel('Axis Z'); title(['L = ',num2str(Length),'Lambda']) % --- Executes on button press in pushbutton3. function pushbutton3_Callback(hObject, eventdata, handles) % hObject handle to pushbutton3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) %%__________________ Sketch using Plot3 ___________________________ global phi global theta global Length global R global x global y global z [THETA,PHI]=meshgrid(theta,phi); R=abs((cos(Length.*pi.*cos(THETA))- cos(Length.*pi))./(sin(THETA))); x=R.*sin(THETA).*cos(PHI); y=R.*sin(THETA).*sin(PHI); z=R.*cos(THETA); %figure plot3(x,y,z); %clear all set(gca,'PlotBoxAspectRatio',[1,1,1]) axis equal; xlabel('Axis X'); ylabel('Axis Y'); zlabel('Axis Z'); title(['L = ',num2str(Length),'Lambda']) % --- Executes on button press in pushbutton4. function pushbutton4_Callback(hObject, eventdata, handles) % hObject handle to pushbutton4 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) %______________________ Sketch Using Surf_________________________ global phi global theta global Length global R

global x global y global z [THETA,PHI]=meshgrid(theta,phi); R=abs((cos(Length.*pi.*cos(THETA))- cos(Length.*pi))./(sin(THETA))); x=R.*sin(THETA).*cos(PHI); y=R.*sin(THETA).*sin(PHI); z=R.*cos(THETA); %Length %figure surf(x,y,z); %clear all set(gca,'PlotBoxAspectRatio',[1,1,1]) axis equal; xlabel ('Axis X'); ylabel ('Axis Y'); zlabel ('Axis Z'); title(['L = ',num2str(Length),'Lambda']) % --- Executes on button press in pushbutton5. function pushbutton5_Callback(hObject, eventdata, handles) % hObject handle to pushbutton5 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) %________________Sketch 2Dimension E Plane Using Polar____________________ global phi global theta global Length global r r=abs((cos(Length.*pi.*cos(phi))- cos(Length.*pi))./(sin(phi))); %figure polar(phi,r); axis equal title(['L = ',num2str(Length),'Lambda']) %clear all function edit3_Callback(hObject, eventdata, handles) % hObject handle to edit3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit3 as text global ap_a; ap_a = str2double(get(hObject,'String')); % returns contents of edit3 as a double % --- Executes during object creation, after setting all properties.

function edit3_CreateFcn(hObject, eventdata, handles) % hObject handle to edit3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'),... get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end function edit6_Callback(hObject, eventdata, handles) % hObject handle to edit6 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit6 as text global ap_b; ap_b = str2double(get(hObject,'String'));% returns contents of edit6 as a double % --- Executes during object creation, after setting all properties. function edit6_CreateFcn(hObject, eventdata, handles) % hObject handle to edit6 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'), ... get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end % --- Executes on button press in pushbutton6. function pushbutton6_Callback(hObject, eventdata, handles) % hObject handle to pushbutton6 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % ploting aperture antenna 3D global ap_a; global ap_b; global phi; global theta; [Phi,Theta]=meshgrid(phi,theta);

% ap_a & ap_b are dimensions of the notch % U = sin(theta).cos(phi) v = sin(theta).sin(phi) for 3D plot U = sin(Theta).*cos(Phi); V = sin(Theta).*sin(Phi); B=2*pi; % u & v both in lowercase for 2D plot u = sin(theta).*cos(0); v = sin(theta).*sin(0); % rho is 2D polar pattern rho = abs (sinc(B*ap_a/2.*u).*sinc(B*ap_b/2.*v)); % E for 3D pattern E = abs( sinc(B*ap_a/2.*U).*sinc(B*ap_b/2.*V)); x = E.*cos(Phi).*sin(Theta); y = E.*sin(Phi).*sin(Theta); z = E.*cos(Theta); % polar plot plot(rho.*sin(phi),rho.*cos(phi)); set(gca,'PlotBoxAspectRatio',[1,3,1]) xlabel('Axis X'); ylabel('Axis Y'); title(['Rectangular Aperture Antenna Cross Section for '... ,num2str(ap_a),',',num2str(ap_b),' Lambda']) figure('Name','3D Aperture Plot'); mesh(x,y,z) set(gca,'PlotBoxAspectRatio',[.5,.5,2]) xlabel('Axis X'); ylabel('Axis Y'); zlabel('Axis Z'); title(['Rectangular Aperture Antenna '... ,num2str(ap_a),',',num2str(ap_b),'Lambda'])

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