polarpattern class

Interactive plot of radiation patterns in polar format

Description

polarpattern class plots antenna or array radiation patterns in interactive polar format. You can also plot other types of polar data. Use these plots when interactive data visualization or measurement is required. Right-click the Polar Measurement window to change the properties, zoom in, or add more data to the plot.

Construction

polarpattern plots antenna or array radiation patterns and other types of data in polar format. polarpattern plots field value data of radiation patterns for visualization and measurement. Right-click the polar plot to interact.

polarpattern(data) creates a polar plot with magnitude values in the vector d. In this polar plot, angles are uniformly spaced on the unit circle, starting at 0 degrees.

polarpattern(angle,magnitude) creates a polar plot from a set of angle vectors and corresponding magnitudes. You can also create polar plots from multiple sets for angle vectors and corresponding sets of magnitude using the syntax: polarpattern(angle1, magnitude1, angle2, magnitude2...).

p = polarpattern(___) returns an object handle that you can use to customize the plot or add measurements. You can specify any of the arguments from the previous syntaxes.

p = polarpattern('gco') returns an object handle from polar pattern in the current figure.

polarpattern(___,Name,Value) creates a polar plot, with additional properties specified by one or more name-value pair arguments. Name is the property name and Value is the corresponding property value. You can specify several name-value pair arguments in any order as Name1, Value1, ..., NameN, ValueN. Properties not specified retain their default values. To list all the property Name,Value pairs, use details(p). To list all the property Name,Value pairs, use details(p). You can use the properties to extract any data from 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.

For a list of properties, see PolarPattern Properties.

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

Input Arguments

data — Antenna or array data

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

Antenna or array data, specified as one of the following:

• A real length-M vector, where M contains the magnitude values with angles assumed to be $$\frac{(0:M-1)}{M}\times {360}^{\circ }$$ degrees.

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

• A real N-D array, where N is the number of dimensions. Arrays with dimensions 2 and greater are independent data sets.

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

When 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.

angle — Set of angles

vector in degrees

Set of angles, specified as a vector in degrees.

magnitude — Set of magnitude values

vector | matrix

Set of magnitude values, specified as a vector or a matrix. For a matrix of magnitude values, each column is an independent set of magnitude values and corresponds to the same set of angles.

Methods

add	Add data to existing polar plot
addCursor	Add cursor to polar plot angle
animate	Replace existing data with new data for animation
createLabels	Create legend labels
findLobes	Main, back and side lobe data
replace	Replace existing data with new data in polar plot
showPeaksTable	Show or hide peak marker table
showSpan	Show or hide angle span between two markers

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: [181x1 double]
                    MagnitudeData: [181x1 double]
                    IntensityData: []
                     AngleMarkers: [0x1 struct]
                    CursorMarkers: [0x1 struct]
                      PeakMarkers: [0x1 struct]
                    ActiveDataset: 1
                  AngleLimVisible: 0
                    LegendVisible: 0
                             Span: 0
                         TitleTop: 'Elevation Cut (Azimuth Angle = 0^{\circ})'
                      TitleBottom: ''
                            Peaks: []
                         FontSize: 10
                     MagnitudeLim: [-40 10]
               MagnitudeAxisAngle: 75
                    MagnitudeTick: [-40 -30 -20 -10 0 10]
          MagnitudeTickLabelColor: 'k'
                         AngleLim: [0 360]
                   AngleTickLabel: {1x24 cell}
              AngleTickLabelColor: 'k'
       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: [0.8000 0.8000 0.8000]
              GridBackgroundColor: 'w'
                 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: [1x1 Figure]
                         NextPlot: 'replace'
                       ColorOrder: [7x3 double]
                  ColorOrderIndex: 1
                     SectorsColor: [16x3 double]
                     SectorsAlpha: 0.5000
                             View: 'full'
                    ZeroAngleLine: 0

Introduced in R2016a

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