phased.IsotropicAntennaElement

Isotropic antenna element

Description

The IsotropicAntennaElement object creates an antenna element with an isotropic response pattern. This antenna object does not support polarization.

To compute the response of the antenna element for specified directions:

1. Define and set up your isotropic antenna element. See Construction.

2. Call step to compute the antenna response according to the properties of phased.IsotropicAntennaElement. The behavior of step is specific to each object in the toolbox.

Note

Starting in R2016b, instead of using the step method to perform the operation defined by the System object™, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.

Construction

H = phased.IsotropicAntennaElement creates an isotropic antenna system object, H. The object models an antenna element whose response is 1 in all directions.

H = phased.IsotropicAntennaElement(Name,Value) creates an isotropic antenna object, H, with each specified property Name set to the specified Value. You can specify additional name-value pair arguments in any order as (Name1,Value1,...,NameN,ValueN).

Properties

FrequencyRange	Operating frequency range Specify the antenna element operating frequency range (in Hz) as a 1-by-2 row vector in the form of [LowerBound HigherBound]. The antenna element has zero response outside the specified frequency range. Default: [0 1e20]
BackBaffled	Baffle the back of antenna element Set this property to true to baffle the back of the antenna element. In this case, the antenna responses to all azimuth angles beyond +/– 90 degrees from the broadside (0 degrees azimuth and elevation) are 0. When the value of this property is false, the back of the antenna element is not baffled. Default: false

Methods

directivity	Directivity of isotropic antenna element
isPolarizationCapable	Polarization capability
pattern	Plot isotropic antenna element directivity and patterns
patternAzimuth	Plot isotropic antenna element directivity or pattern versus azimuth
patternElevation	Plot isotropic antenna element directivity or pattern versus elevation
plotResponse	Plot response pattern of antenna
step	Output response of antenna element

Common to All System Objects
release	Allow System object property value changes

Examples

Plot Isotropic Antenna Element Response

Create an isotropic antenna operating over a frequency range from 800 MHz to 1.2 GHz. The operating frequency is 1 GHz. Find the response of the antenna at boresight. Then, plot the polar-pattern elevation response of the antenna.

antenna = phased.IsotropicAntennaElement( ...
    'FrequencyRange',[800e6 1.2e9]);
fc = 1e9;

Obtain the response at boresight.

resp = antenna(fc,[0;0])

resp = 1

Plot the response pattern.

pattern(antenna,fc,0,[-90:90],'CoordinateSystem','polar', ...
    'Type','powerdb','Normalize',true)

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

• pattern, patternAzimuth, patternElevation, and plotResponse methods are not supported.

• See System Objects in MATLAB Code Generation (MATLAB Coder).