polar

Plot specified object parameters on polar coordinates

Syntax

p = polar(budgetobj,i,j)

lineseries = polar(cktobj,'parameter1',...,'parametern')

lineseries = polar(___,x-axis parameter,x-axis format,'condition1',value1,...,'conditionm',valuem,'freq',freq,'pin',pin)

Description

p = polar(budgetobj,i,j) plots the (i,j)th s-parameter on polar plot for an rfbudget object. p is a polar plot function object. For more information about properties of p, see Polar Properties.

lineseries = polar(cktobj,'parameter1',...,'parametern') plots the parameters parameter1, ..., parametern on polar plot for a circuit object cktobj.

The polar function returns a column vector of handles to lineseries objects, one handle per element.

lineseries = polar(___,x-axis parameter,x-axis format,'condition1',value1,...,'conditionm',valuem,'freq',freq,'pin',pin) plots the specified parameters at the specified operating conditions on polar plot for a circuit object, cktobj. Use this option with the input arguments in the previous syntax.

Note

• For all circuit objects except those that contain data from a data file, you must use the analyze method to perform a frequency domain analysis before calling polar.

• Use the function polarpattern (Antenna Toolbox), or the MATLAB^® function polarplot to plot parameters that are not part of a rfckt or rfbudget object, but are specified as vector data.

Examples

Plot S-Parameters of RF Budget Object on Polar Plot

Create an RF budget object from default.s2p.

Sa = nport('default.s2p');
rfobj = rfbudget(Sa,Sa.NetworkData.Frequencies,-30,10);

Plot S11 on polar plot.

p = polar(rfobj,1,1);
p.LineStyle = ':';

In the newly opened figure window, click View > Figure Toolbar, then hover over the dataset to see the parameters specific to a particular point. You can right click to interact with the plot.

Plot Circuit Parameters of Network Object on Polar Plot

Create an amplifier object from |default.s2p|.

amp = read(rfckt.amplifier,'default.s2p');

Plot S11 on polar plot.

lineseries = polar(amp,'S11')

lineseries = 
  Line (S_{11}) with properties:

              Color: [0.0660 0.4430 0.7450]
          LineStyle: '-'
          LineWidth: 0.5000
             Marker: 'none'
         MarkerSize: 6
    MarkerFaceColor: 'none'
              XData: [-0.7247 -0.7318 -0.7388 -0.7457 -0.7525 -0.7593 -0.7661 -0.7728 -0.7794 -0.7859 -0.7924 -0.7989 -0.8055 -0.8120 -0.8185 -0.8249 -0.8312 -0.8373 -0.8431 -0.8487 -0.8539 -0.8587 -0.8632 -0.8673 -0.8711 -0.8748 … ] (1×191 double)
              YData: [-0.4813 -0.4715 -0.4616 -0.4517 -0.4419 -0.4320 -0.4221 -0.4123 -0.4024 -0.3926 -0.3827 -0.3729 -0.3632 -0.3535 -0.3438 -0.3341 -0.3244 -0.3145 -0.3046 -0.2946 -0.2844 -0.2741 -0.2637 -0.2532 -0.2427 -0.2322 … ] (1×191 double)

  Show all properties

Input Arguments

budgetobj — RF budget object

rfbudget object

RF budget object, specified as a rfbudget object.

cktobj — Circuit object

object handle

Circuit object (rfckt) object, specified as an object handle.

To get a list of valid parameters for cktobj, type listparam(cktobj).

x-axis parameter — Independent variable along x-axis

character vector | string

The independent variable along the x-axis to plot the specified parameters along the y-axis, specified as a character vector or string. Several x-axis parameter values are available for all objects. When you import rfckt.amplifier, rfckt.mixer, or rfdata.data object specifications from a .p2d or .s2d file, you can also specify any operating conditions from the file that have numeric values, such as bias.

The following table shows the most commonly available parameters and the corresponding x-axis parameter values. The default settings listed in the table are used if x-axis parameter is not specified.

Parameter Name	x-axis parameter Values
Pout, Phase, LS11, LS12, LS21, LS22	Pin (default), Freq
S11, S12, S21, S22, NF, OIP3, VSWRIn, VSWROut, GammaIn, GammaOut, FMIN, GammaOPT, RN	Freq
AM/AM, AM/PM	AM

x-axis format — Format used for specific x-axis parameter

character vector | string

The format used for the specific x-axis parameter, specified as a character vector or string. No x-axis format specification is needed when x-axis parameter is an operating condition.

The following table shows the x-axis format values that are available for the x-axis parameter values listed in the preceding table, along with the default settings that are used if x-axis format is not specified.

x-axis parameter Values	x-axis format Values
Pin	dBm (default), mW, W, dBW
Freq	THz, GHz, MHz, KHz, Hz By default, x-axis format is chosen to provide the best scaling for the given x-axis parameter values.
AM	Magnitude (decibels) (default), Magnitude (linear)

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: lineseries = polar(h,'Freq',2.1e9)

'condition1',value1,...,'conditionm',valuem — Optional condition-value pairs

scalar

Optional condition-value pairs at which to plot the specified parameters, specified as a series of 'condition',value pairs separated by commas. These pairs are usually operating conditions from a .p2d or .s2d file. For some parameters, you can specify a set of frequency or input power values at which to plot the specified parameter.

For example:

• When plotting large-signal S-parameters as a function of input power, you can specify frequency points of interest using condition-value pairs.

• When plotting large-signal S-parameters as a function of frequency, you can specify input power levels of interest using condition-value pairs.

• When plotting parameters as a function of an operating condition, you can specify both frequency and input power values using condition-value pairs.

freq — Optional frequency value

scalar

The optional frequency value, in Hz, at which to plot the specified parameters. Freq is specified as the comma-separated pair of 'Freq', and a scalar value.

pin — Optional input power level

scalar

The optional input power value, in dBm, at which to plot the specified parameters. pin is specified as the comma-separated pair of 'pin', and a scalar value.

Output Arguments

p — Polar plot function object

object handle

Polar plot function object, returned as object handle.

For more information about properties of p, see Polar Properties.

lineseries — lineseries object

column vector of object handles.

lineseries object, returned as a column vector of object handles.

Tips

• If you do not specify any operating conditions as arguments to the polar method, then the method plots the parameter values based on the currently selected operating condition.

• If you specify one or more operating conditions, the polar method plots the parameter values based on those operating conditions.

• When you use an operating condition for the x-axis parameter input argument, the method plots the parameters for all operating condition values.

• Use the inspect function from MATLAB to open the Property Inspector for changing line properties. For more information, see Line Properties.

• The reference pages for MATLAB functions such as figure, axes, and text list available properties and provide links to detailed descriptions.

Version History

Introduced before R2006a