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 with magnitude magE over the specified phi and theta angle vectors. Using patternCustom on multiple datasets plots multiple radiation patterns in the same figure.

patternCustom(magE,theta,phi,Name,Value) uses additional options specified by one or more Name,Value pair arguments.

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 .

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));

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

p = PatternPlotOptions('Transparency',0.6);
figure
patternCustom(helixdata(:,3),helixdata(:,2),helixdata(:,1),...
 'CoordinateSystem','rectangular','PatternOptions',p);

Visualize 2-D Radiation Patterns of Helix Directivity

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

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 polar coordinates.

figure;
patternCustom(MagE, theta, phi,'CoordinateSystem','polar',...
    'Slice','phi','SliceValue',0);

Input Arguments

magE — Magnitude of plotted quantity

real vector | matrix

Magnitude of plotted quantity, specified as one of the following:

• A N-by-1 real vector . N is the same size as the phi and theta angle vectors.

• A M-by-R matrix. The matrix should be the same size as phi x theta.

where theta and phi angles are in the spherical coordinate system specified as a vector.

Data quantities plotted include directivity, E-fields, H-fields, or power of an antenna or array object.

Data Types: double

theta — Theta angles in spherical coordinates

vector in degrees

Theta angles in spherical coordinates, specified as a vector in degrees. If azimuth and elevation values are given, theta angle values are 90 degrees minus elevation.

For more information, Antenna Toolbox Coordinate System.

Data Types: double

phi — Phi angles in spherical coordinates

vector in degrees

Phi angles in spherical coordinates, specified as a vector in degrees. If azimuth and elevation values are given, phi angle values are same as azimuth values.

For more information, Antenna Toolbox Coordinate System.

Data Types: double

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'CoordinateSystem','rectangular'

CoordinateSystem — Coordinate system of radiation pattern

'polar' (default) | 'rectangular'

Coordinate system of radiation pattern, specified as the comma-separated pair consisting of 'CoordinateSystem' and one of these values: 'polar', 'rectangular'.

Example: 'CoordinateSystem','polar'

Data Types: char

Slice — Plane to visualize 2-D data

'theta' | 'phi'

Plane to visualize 2-D data, specified as a comma-separated pair consisting of 'Slice' and 'theta' or 'phi'.

Example: 'Slice','phi'

Data Types: char

SliceValue — Angle values for slice

scalar | vector

Angle values for slice, specified as a comma-separated pair consisting of 'SliceValue' and a scalar or a vector.

PatternOptions — Parameter to change pattern plot properties

PatternPlotOptions object (default) | scalar

Parameter to change pattern plot properties, specified as the comma-separated pair consisting of 'PatternOptions' and a PatternPlotOptions output. The properties that you can vary are:

• Transparency

• MagnitudeScale

Other properties used in the 'PatternOptions' for the inset figure are ignored in patternCustom.

Example: p = PatternPlotOptions('Transparency',0.1); Create a pattern plot option with a transparency of 0.1. helixdata = csvread('antennadata_test.csv',1,0);patternCustom(helixdata(:,3),helixdata(:,2),helixdata(:,1),'CoordinateSystem','rectangular','PatternOptions',p); Use this pattern plot option to visualize the pattern of a helix antenna.

Data Types: double

Output Arguments

hplot — Lines or surfaces in figure window

object handle

Lines or surfaces in figure window, returned as object handle.

Version History

Introduced in R2016a