polarpattern

Interactive plot of radiation patterns in polar format

Description

The polarpattern object creates an interactive plot of antenna or array radiation patterns in polar format with uniformly spaced angles. You can also plot other types of polar data. Use this plot for interactive data visualization or measurement. To change the properties, zoom in, or add more data to the plot, right-click or scroll or drag the Polar Measurement window.

Creation

Syntax

polarpattern

polarpattern(data)

polarpattern(angle,magnitude)

polarpattern(___,PropertyName=Value)

polarpattern(ax,___)

p = polarpattern(___)

p = polarpattern('gco')

Description

polarpattern creates an empty polar plot. You can add plots of antenna or array radiation patterns and other types of data to the plot by importing saved polari objects from MAT-files.

polarpattern(data) creates a polar plot with real magnitude values in the vector data with angles uniformly spaced on the unit circle starting at 0 degrees. Magnitudes may be negative when dB data units are used. For a matrix data, columns of data are independent datasets. For N-data arrays, dimensions 2 and greater are independent datasets. For complex values, magnitude and angle are derived from data.

polarpattern(angle,magnitude) creates a polar plot for a set of angles and corresponding magnitudes. You can also create polar plots from multiple sets of angle vectors in degrees and corresponding sets of magnitude using the syntax: polarpattern(angle1, magnitude1,..., angleN, magnitudeN).

polarpattern(___,PropertyName=Value) sets PolarPattern Properties (Antenna Toolbox) using one or more name–value arguments. PropertyName is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as PropertyName1=Value1,...,PropertyNameN=ValueN. Properties that you do not specify, retain their default values. To list all the property names and values, use details(p). You can use the properties to extract data about the radiation pattern from the polar plot.

For example, p = polarpattern(data,Peaks=3) identifies and displays the three highest peaks in the pattern data.

polarpattern(ax,___) creates a polar plot using axes object, ax instead of the current axes object.

p = polarpattern(___) creates a polari object using any combination of input arguments from the previous syntaxes. Use this syntax to customize the plot or add measurements.

p = polarpattern('gco') creates a polar plot object from the polar pattern in the current figure.

Input Arguments

data — Antenna or array data

real length-M vector | real M-by-N matrix | real multidimensional array | complex vector or matrix

Antenna or array data, specified as one of these options

• A real length-M vector, containing M magnitude values with angles their defined as $$\frac{(0:M-1)}{M}\times {360}^{\circ }$$ degrees.

• A real M-by-N matrix, containing M magnitude values in a dataset and N such independent data sets. Each column of the matrix has angles in degrees from the vector $$\frac{(0:M-1)}{M}\times {360}^{\circ }$$.

• A real multidimensional array. Arrays with 2 or more dimensions contain independent data sets.

• A complex vector or matrix, that contains Cartesian coordinates (x, y) of each point. x contains the real part of the data and y contains the imaginary part of the data.

When the data is in a logarithmic form, such as dB, magnitude values can be negative. In this case, polarpattern plots the smallest magnitude values at the origin of the polar plot and largest magnitude values at the maximum radius.

Data Types: double
Complex Number Support: Yes

angle — Set of angles

vector

Set of angles in degrees, specified as a vector.

Data Types: double

magnitude — Set of magnitude values

vector | matrix

Set of magnitude values, specified as a vector or a matrix. If you specify this input as a matrix, each column is an independent set of magnitude values and corresponds to the same set of angles in the same column of the angle input.

Data Types: double

ax — Axes of polar plot

axes object

Axes of the polar plot, specified as an axes object.

Output Arguments

p — polari object

polari object

Stores a polari object with a set of properties. Use p to modify properties of the plot after creation. For a list of all the properties, see PolarPattern Properties (Antenna Toolbox).

Example: P = polarplot(V)

Object Functions

Examples

Plot Cosine Pattern in Polar Coordinates

Specify a cosine antenna pattern from 0° to 360° in azimuth at 0° elevation. Then, plot the antenna pattern using polarpattern.

Create the pattern.

az = [0:360];
p = abs(cosd(az));

Plot the polar pattern of the antenna for an azimuth cut at 0° elevation.

polarpattern(p,'TitleTopTextInterpreter','tex','TitleTop','Azimuth Cut (Elevation Angle = 0^{\circ})');

Azimuth Pattern of a 3-by-2 URA

Construct a 3-by-2 rectangular lattice URA. By default, the array consists of isotropic antenna elements. Assume the operating frequency is 1 GHz. Then, plot the antenna pattern using polarpattern.

Create the array.

array = phased.URA('Size',[3 2]);
fc = 1.0e9;

Plot the polar pattern of the array for an elevation cut at 0° azimuth.

c = physconst('LightSpeed');
p = pattern(array,fc,[-180:180],0,'PropagationSpeed',c,'CoordinateSystem',...
    'polar','Type','powerdb','Normalize',true);
polarpattern([-180:180],p);

Polar Pattern Display with Title for Short-Dipole Antenna

Specify a short-dipole antenna with the dipole oriented along the z-axis and operating at 250 MHz. Then, plot the antenna pattern using polarpattern and specifying a title.

Create the short-dipole antenna element System object™.

antenna = phased.ShortDipoleAntennaElement('FrequencyRange',[100e6,600e6],...
    'AxisDirection','Z');
fc = 250.0e6;

Plot the polar pattern of the antenna for an elevation cut at 0° azimuth.

v = pattern(antenna,fc,0,-90:90);
polarpattern([-90:90],v,'TitleTopTextInterpreter','tex',...
    'TitleTop','Elevation Cut (Azimuth Angle = 0^{\circ})');

Polar Pattern Properties

Specify a short-dipole antenna with the dipole oriented along the z-axis and operating at 250 MHz. Then, plot the antenna pattern using polarpattern and specifying a title.

Create the short-dipole antenna element System object™.

antenna = phased.ShortDipoleAntennaElement('FrequencyRange',[100e6,600e6],...
    'AxisDirection','Z');
fc = 250.0e6;

Create the polar pattern of the antenna for an elevation cut at 0° azimuth.

p = pattern(antenna,fc,0,-90:90);
P = polarpattern([-90:90],p,'TitleTopTextInterpreter','tex',...
    'TitleTop','Elevation Cut (Azimuth Angle = 0^{\circ})');

Display the properties of the plot.

details(P)

  internal.polari handle with properties:

                      Interactive: 1
                     LegendLabels: ''
                   AntennaMetrics: 0
                        CleanData: 0
                        AngleData: [181×1 double]
                    MagnitudeData: [181×1 double]
                    IntensityData: []
                     AngleMarkers: [0×1 struct]
                    CursorMarkers: [0×1 struct]
                      PeakMarkers: [0×1 struct]
                    ActiveDataset: 1
                  AngleLimVisible: 0
                    LegendVisible: 0
                             Span: 0
                         TitleTop: 'Elevation Cut (Azimuth Angle = 0^{\circ})'
                      TitleBottom: ''
                            Peaks: []
                         FontSize: 8
                     MagnitudeLim: [-40 10]
               MagnitudeAxisAngle: 75
                    MagnitudeTick: [-40 -30 -20 -10 0 10]
          MagnitudeTickLabelColor: [0.1294 0.1294 0.1294]
                         AngleLim: [0 360]
                   AngleTickLabel: {'0'  '15'  '30'  '45'  '60'  '75'  '90'  '105'  '120'  '135'  '150'  '165'  '180'  '195'  '210'  '225'  '240'  '255'  '270'  '285'  '300'  '315'  '330'  '345'}
              AngleTickLabelColor: [0.1294 0.1294 0.1294]
       TitleTopFontSizeMultiplier: 1.1000
    TitleBottomFontSizeMultiplier: 0.9000
               TitleTopFontWeight: 'bold'
            TitleBottomFontWeight: 'normal'
          TitleTopTextInterpreter: 'tex'
       TitleBottomTextInterpreter: 'none'
                   TitleTopOffset: 0.1500
                TitleBottomOffset: 0.1500
                         ToolTips: 1
               MagnitudeLimBounds: [-Inf Inf]
      MagnitudeFontSizeMultiplier: 0.9000
          AngleFontSizeMultiplier: 1
                       AngleAtTop: 90
                   AngleDirection: 'ccw'
                  AngleResolution: 15
           AngleTickLabelRotation: 0
             AngleTickLabelFormat: '360'
          AngleTickLabelColorMode: 'contrast'
                     PeaksOptions: {}
            AngleTickLabelVisible: 1
                            Style: 'line'
                        DataUnits: 'dB'
                     DisplayUnits: 'dB'
                    NormalizeData: 0
                 ConnectEndpoints: 0
              DisconnectAngleGaps: 0
                        EdgeColor: 'k'
                        LineStyle: '-'
                        LineWidth: 1
                         FontName: 'Helvetica'
                     FontSizeMode: 'auto'
              GridForegroundColor: [0.3804 0.3804 0.3804]
              GridBackgroundColor: [1 1 1]
                 DrawGridToOrigin: 0
                     GridOverData: 0
               GridAutoRefinement: 0
                        GridWidth: 0.5000
                      GridVisible: 1
                         ClipData: 1
                  TemporaryCursor: 1
                 MagnitudeLimMode: 'auto'
           MagnitudeAxisAngleMode: 'auto'
                MagnitudeTickMode: 'auto'
      MagnitudeTickLabelColorMode: 'contrast'
        MagnitudeTickLabelVisible: 1
                   MagnitudeUnits: ''
                   IntensityUnits: ''
                           Marker: 'none'
                       MarkerSize: 6
                           Parent: [1×1 Figure]
                         NextPlot: 'replace'
                       ColorOrder: [7×3 double]
                  ColorOrderIndex: 1
                     SectorsColor: [16×3 double]
                     SectorsAlpha: 0.5000
                             View: 'full'
                    ZeroAngleLine: 0

  Methods, Events, Superclasses

Version History

Introduced in R2016a