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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

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.

example

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.

example

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).

example

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. Unspecified properties 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.

For a list of properties, see PolarPattern Properties.

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

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Antenna or array data, specified as one of these options

  • A real length-M vector, containing M magnitude values with angles their defined as (0:M1)M×360 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 (0:M1)M×360.

  • 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

Set of angles in degrees, specified as a vector.

Data Types: double

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

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

Output Arguments

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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.

Example: P = polarplot(V)

Object Functions

addAdd data to polar plot
addCursorAdd cursor to polar plot angle
animateReplace existing data with new data for animation
createLabelsCreate legend labels for polar plot
findLobesMain, back, and side lobe data
replaceReplace polar plot data with new data
showPeaksTableShow or hide peak marker table
showSpanShow or hide angle span between two markers

Examples

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Create a default Vivaldi antenna and calculate the directivity at 1.5 GHz.

v = vivaldi;
V = pattern(v,1.5e9,0,0:1:360);

Plot the polar pattern of the calculated directivity.

P = polarpattern(V);

{"String":"","Tex":[],"LaTex":[]}

Create a default cavity antenna. Calculate the directivity of the antenna and write the data to cavity.pln using the msiwrite function.

c = cavity;
msiwrite(c,2.8e9,'cavity','Name','Cavity Antenna Specifications');

Read the cavity specification file into Horizontal, Vertical, and Optional structures using the msiread function.

[Horizontal,Vertical,Optional] = msiread('cavity.pln')
Horizontal = struct with fields:
    PhysicalQuantity: 'Gain'
           Magnitude: [360x1 double]
               Units: 'dBi'
             Azimuth: [360x1 double]
           Elevation: 0
           Frequency: 2.8000e+09
               Slice: 'Elevation'

Vertical = struct with fields:
    PhysicalQuantity: 'Gain'
           Magnitude: [360x1 double]
               Units: 'dBi'
             Azimuth: 0
           Elevation: [360x1 double]
           Frequency: 2.8000e+09
               Slice: 'Azimuth'

Optional = struct with fields:
         name: 'Cavity Antenna Specifications'
    frequency: 2.8000e+09
         gain: [1x1 struct]

Plot the polar pattern of the cavity at azimuth angles.

P = polarpattern(Horizontal.Azimuth,Horizontal.Magnitude);

{"String":"","Tex":[],"LaTex":[]}

Create a default monopole antenna and calculate the directivity at 75 MHz.

m = monopole;
M = pattern(m,75e6,0,0:1:360);

Plot the polar pattern of the antenna.

P = polarpattern(M,'TitleTop','Polar Pattern of Monopole');

{"String":"","Tex":[],"LaTex":[]}

Create a default dipole antenna and calculate the directivity at 75 MHz.

d = dipole;
D = pattern(d,75e6,0,0:1:360);

Plot the polar pattern of the antenna and display the properties of the plot.

P = polarpattern(D);

{"String":"","Tex":[],"LaTex":[]}

details(P)
  internal.polari handle with properties:

                      Interactive: 1
                     LegendLabels: ''
                   AntennaMetrics: 0
                        CleanData: 1
                        AngleData: [361x1 double]
                    MagnitudeData: [361x1 double]
                    IntensityData: []
                     AngleMarkers: [0x1 struct]
                    CursorMarkers: [0x1 struct]
                      PeakMarkers: [0x1 struct]
                    ActiveDataset: 1
                  AngleLimVisible: 0
                    LegendVisible: 0
                             Span: 0
                         TitleTop: ''
                      TitleBottom: ''
                            Peaks: []
                         FontSize: 10
                     MagnitudeLim: [-50 10]
               MagnitudeAxisAngle: 75
                    MagnitudeTick: [-40 -20 0]
          MagnitudeTickLabelColor: 'k'
                         AngleLim: [0 360]
                   AngleTickLabel: {1x24 cell}
              AngleTickLabelColor: 'k'
       TitleTopFontSizeMultiplier: 1.1000
    TitleBottomFontSizeMultiplier: 0.9000
               TitleTopFontWeight: 'bold'
            TitleBottomFontWeight: 'normal'
          TitleTopTextInterpreter: 'none'
       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

Remove -inf and NaN values from monopole antenna polar pattern data by using the CleanData and AntennaMetrics properties of a polari object. Use CleanData for partial data with -inf and NaN values.

m = monopole; 
m.GroundPlaneLength = inf;

Plot the beamwidth of the antenna at 70 MHz.

figure;
beamwidth(m,70e6,0,-50:30)

{"String":"Figure contains an object of type uicontrol.","Tex":[],"LaTex":[]}

Plot the radiation pattern of the antenna at 70 MHz.

figure;
pattern(m,70e6,0,-50:30);

{"String":"","Tex":[],"LaTex":[]}

Use polarpattern to view the antenna metrics of the radiation pattern.

P = polarpattern('gco');
P.CleanData = 1;
P.AntennaMetrics = 1;

{"String":"Figure contains objects of type uicontrol.","Tex":[],"LaTex":[]}

Compare the beamwidth plot and the polarpattern plot. The Antenna Metrics does not represent the beamwidth correctly.

You can also clean the data by right clicking on the plot and selecting Clean Data.

choosecleandata.png

After you clean the data, the polarpattern plot calculation matches the beamwidth plot calculation.

Version History

Introduced in R2016a