Create plane wave excitation environment for antenna or array
planeWaveExcitation object creates an environment in
which a plane wave excites an antenna or array. Plane wave excitation is a scattering
solution that solves the receiver antenna problem.
an environment in which a plane wave excites an antenna or array. The
default receiver antenna is a dipole that is excited by a plane wave
travelling along the positive x-axis with a
h = planeWaveExcitation
sets Properties using one or more name-value
h = planeWaveExcitation(Name=Value)
Name is the property name and
Value is the corresponding value. You can specify
several name-value arguments in any order as
NameN=ValueN. Properties you do not specify retain
their default values.
Element — Antenna or array element, or backing structure without exciter
dipole (default) | antenna object | array object
Antenna or array element, or a backing structure (cavity or reflector) without an exciter, specified as an antenna or array object from the catalog.
SolverType is set to
"FMM", antennas with dielectric substrate
"Air" cannot be used as
Direction — Incidence direction of plane wave
[1 0 0] (default) | three-element real vector
Incidence direction of the plane wave, specified as a three-element real vector containing the Cartesian coordinates of a point in space. The object creates the direction vector by joining a line from origin to this point.
Direction=[0 0 1]
Polarization — Polarization of incident electric field
[0 0 1] (default) | three-element complex vector
Polarization of the incident electric field, specified as a three-element complex vector containing the Cartesian components of the electric field in V/m. The polarization gives the orientation and magnitude of the electric field.
Polarization=[0 1 0]
Complex Number Support: Yes
SolverType — Solver for antenna analysis
"MoM" (default) |
Solver for the antenna analysis, specified as one of these values:
"MoM" --- Use the method of moments.
"FMM" --- Use the fast multipole method.
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on antenna or array surface|
|Current distribution on antenna or array surface|
|Direction of arrival of signal|
|Design prototype antenna or arrays for resonance around specified frequency|
|Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays|
|Mesh properties of metal, dielectric antenna, or array structure|
|Change mesh mode of antenna structure|
|Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array|
|Azimuth pattern of antenna or array|
|Elevation pattern of antenna or array|
|Display antenna, array structures or shapes|
Default Plane Wave Excitation
Excite a dipole antenna using a plane wave and view it.
h = planeWaveExcitation; show(h)
The blue arrow shows the direction of propagation of the plane wave. The default direction is along the x-axis. The pink arrow shows polarization of the plane wave. The default polarization is perpendicular to the direction of propagation. In this case, the polarization is along the z-axis.
Feed Current of Antenna Excited by Plane Wave
Excite a dipole antenna using plane wave. Calculate the feed current at 70 MHz.
h = planeWaveExcitation
h = planeWaveExcitation with properties: Element: [1×1 dipole] Direction: [1 0 0] Polarization: [0 0 1] SolverType: 'MoM'
cur = feedCurrent(h,70e6)
cur = 0.0182 - 0.0032i
Current Distribution on Antenna
Excite a dipole antenna using a plane wave. The polarization of the wave is along the z-axis and the direction of propagation is along the negative x-axis. View the antenna.
p = planeWaveExcitation(Element=dipole,Direction=[-1 0 0],Polarization=[0 0 1]); show(p)
Plot the current distribution on the dipole antenna at 70 MHz.
Antenna Excited by Plane Wave in Arbitrary Direction
Consider a dipole excited by a plane wave.
p = planeWaveExcitation; p.Direction = [0 1 1]; show(p)
For this antenna, the polarization and direction are not orthogonal to each other and thus any analysis errors out.
Use the cross-product function to find the appropriate polarization direction of such wave.
p = planeWaveExcitation; p.Polarization = cross(p.Direction,[0 1 1]); show(p)
Calculate the current distribution of the antenna.
Plane Wave Excitation of Infinite Array
Excite an infinite array using a plane wave.
p = planeWaveExcitation(Element=infiniteArray)
p = planeWaveExcitation with properties: Element: [1x1 infiniteArray] Direction: [1 0 0] Polarization: [0 0 1] SolverType: 'MoM'
Analyze Cavity Structure Using Plane Wave Excitation
This example shows how to create and analyze a cavity-shaped backing structure without an exciter element using
Create Cavity Antenna
Create a cavity antenna operating at 1 GHz using the
design function and the
cavity element from the antenna catalog. Display the antenna.
f = 1e9; ant = design(cavity,f); figure show(ant)
Derive Backing Structure
Derive the backing structure from the cavity antenna by specifying the
'Exciter' property as an empty array.
ant.Exciter = 
ant = cavity with properties: Exciter:  Substrate: [1x1 dielectric] Length: 0.1690 Width: 0.1690 Height: 0.0634 Spacing: 0.0634 EnableProbeFeed: 0 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
Display the backing structure.
Mesh Backing Structure
Mesh the cavity structure with a maximum edge length of 10 mm.
Plot Directivity Pattern
Use the cavity backing structure as a receiver element in a plane wave excitation environment and plot its directivity at 1 GHz.
pw = planeWaveExcitation(Element=ant); figure pattern(pw,f)
 Balanis, C. A. Antenna Theory. Analysis and Design. 3rd Ed. Hoboken, NJ: John Wiley & Sons, 2005.
Introduced in R2017a