MATLAB: How to plot the two dimensional transmitter antenna pattern

2dantennapatternplotRF Toolboxtransmitter

Is there a way to plot the two-dimensional transmitter antenna pattern vice the colorized 3D plots obtained when one uses the command "pattern(tx,100e6)" for example. Is there a way to place a pointer on a specific spot on the pattern and read the antenna gain. In effect, I want to take a "slice" on the 3D antenna pattern plots.

Best Answer

There are several ways of creating a 2D pattern.

1. Using the pattern function on an element from the Antenna Toolbox catalog. Look at the following example in our documentation page.

https://www.mathworks.com/help/antenna/ref/pattern.html?s_tid=srchtitle#buorswr-elevation

2. Using the patternAzimuth or patternElevation functions on an element from the Antenna Toolbox catalog

https://www.mathworks.com/help/antenna/ref/patternazimuth.html?s_tid=srchtitle

https://www.mathworks.com/help/antenna/ref/patternelevation.html

3. Using 'patternCustom' on imported data

https://www.mathworks.com/help/antenna/ref/patterncustom.html?s_tid=srchtitle#d120e63352

Look at the section titled, 'Visualize 2D radiation pattern of helix directivity

4. Using 'polarpattern'

https://www.mathworks.com/help/antenna/ref/polarpattern-class.html?s_tid=srchtitle

All the plots that are generated from these functions are interactive, meaning you can put markers on the traces and read out the directivity/gain values. Using the right-click inside or outside the axes also allows more control. The polar plot capability for the functions (1-3) is based on (4). Also, this example should be helpful

https://www.mathworks.com/help/antenna/gs/interact-with-polar-plot.html

More information on pattern

https://www.mathworks.com/help/antenna/ug/field-analysis.html

Related Solutions

MATLAB: How to change the properties of “patternElevation” or “patternAzimuth” polarpattern plots

In this case "patternElevation" or "patternAzimuth" function plots are of "polar pattern" types plots. You can grab the handle for these plots using the following command:

>> pAx = polarpattern('gco'); % grab the handle for current polar plot

Please take a look at the different commands that you can use to manipulate different properties:

1. How to change line specification in the "patternElevation" plot? *

>> d = dipole; % Create dipole

>> patternElevation(d,70e6,[0 45],'Elevation',-140:5:140); % Plot the figure using "patternElevation" function.

>> pAx = polarpattern('gco'); % grab the handle for polar plot

Please see the following documentation page for changing the 'LineStyle' property.
https://www.mathworks.com/help/antenna/ref/polarpattern-properties.html#property_d119e64337

2. How to change the magnitude limits using script?

Use the pAx handle created in step 1, to change the "MagnitudeLim" property. Please the see the link below to manipulate the value for this property.
https://www.mathworks.com/help/antenna/ref/polarpattern-properties.html#property_d119e61997

>> pAx.MagnitudeLim % Shows current value for "MagnitudeLim" property.

3. Peaks in the plot are shown only for one dataset at a time. Is there any way to visualize peaks table for multiple data sets?

You can get all the "PeakMarkers" property values in the script. But currently there is no way to show both data set peak values in one table. You can switch between data set by clicking on lines in the plot to change the displayed values in "Peaks" table in this plot.

>> pAx.PeakMarkers % Returns 2 X1 struct array with "magnitude" field which contains the peak values

MATLAB: Is there a way to extract numerical information on the antenna directivity as opposed to just visualizing it using the pattern command

Yes, if you want the entire pattern, you can just specify an output, like

[D,az,el] = pattern(array,fc,az,el,'Type','directivity');

On the other hand, if you just want to compute directivity values for certain directions, you can consider using directivity() method, as

D = directivity(array,fc,[az;el])

HTH

Best Answer

Related Solutions

MATLAB: How to change the properties of “patternElevation” or “patternAzimuth” polarpattern plots

MATLAB: Is there a way to extract numerical information on the antenna directivity as opposed to just visualizing it using the pattern command

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