Radiation pattern with matlab

patternCustom

Plot radiation pattern using spherical coordinate system (phi and theta angles)

Syntax

patternCustom(magE,theta,phi)

patternCustom(magE,theta,phi,Name,Value)

hplot = patternCustom(___)

Description

patternCustom(magE,theta,phi) plots the 3-D radiation pattern of an antenna magnitude, magE over the specified phi and theta angle vectors.

hplot = patternCustom(___) returns handles of the lines or surface in the figure window. This syntax accepts any combination of arguments from the previous syntaxes

Examples

Visualize Radiation Pattern From Antenna Data File

Consider a helix antenna data file in .csv format. This file contains the magnitude of the antenna directivity in phi and theta angles. Read The File 

Command : openExample('antenna/VisualizeRadiationPatternFromAntennaDataFileExample')

helixdata = csvread('antennadata_test.csv',1,0);

Use patternCustom to extract the magnitude of directivity, and the phi, and theta angle values. Plot the 3-D polar radiation pattern.

patternCustom(helixdata(:,3),helixdata(:,2),helixdata(:,1));

Visualize Radiation Pattern From Antenna Data File

Use the same data to plot the 3-D rectangular radiation pattern.

figure

patternCustom(helixdata(:,3),helixdata(:,2),helixdata(:,1),...

 'CoordinateSystem','rectangular');

3D Rectangular radiation Pattern

Visualize 2-D Radiation Patterns of Helix Directivity

Calculate the magnitude, azimuth, and elevation angles of a helix's directivity at 2 GHz.

Command :

openExample('antenna/VisualizeRectangularAndPolar2DRadiationPatternOfHelixExample')

h = helix;

[D,az,el] = pattern(h,2e9);

Here, az = the angle from the positive x-axis to the directivity vector's orthogonal projection onto the xy plane, moving in the direction towards the y-axis.

el = the angle from the directivity vector's orthogonal projection onto the xy plane to the vector, moving in the direction towards the z-axis.

Extract theta and phi angles of the directivity magnitude.

phi = az';

theta = (90-el);

MagE = D';

Plot 2-D phi slice of the antenna in rectangular coordinates.

figure;

patternCustom(MagE,theta,phi,'CoordinateSystem','rectangular',...

    'Slice','phi','SliceValue',0);

Plot 2-D phi slice of the antenna in rectangular coordinates.

Plot 2-D phi slice of the antenna in polar coordinates.

figure;

patternCustom(MagE, theta, phi,'CoordinateSystem','polar',...

    'Slice','phi','SliceValue',0);

Plot 2-D phi slice of the antenna in polar coordinates.