Create cycloid dipole antenna
dipoleCycloid object is a half-wavelength cycloid
dipole antenna. For the default cycloid dipole, the feed point is on the loop section.
The default length is for an operating frequency of 48 MHz.
The width of the dipole is related to the circular cross-section by the equation
d is the diameter of equivalent cylindrical pole
r is the radius of equivalent cylindrical pole
For a given cylinder radius, use the
cylinder2strip utility function to calculate the equivalent width.
half-wavelength cycloid dipole antenna oriented along Z-axis.
dc = dipoleCycloid
creates a half-wavelength cycloid dipole antenna, with additional properties
specified by one or more name-value pair arguments.
dc = dipoleCycloid(Name,Value)
is the property name and
Value is the corresponding
value. You can specify several name-value pair arguments in any order as
ValueN. Properties not specified retain their default
Length — Dipole length along z-axis
1.2200 (default) | scalar
Dipole length along z-axis, specified as a scalar in meters. By default, the length is for an operating frequency of 48 MHz.
Width — Dipole width
0.0508 (default) | scalar
Dipole width, specified as a scalar in meters.
LoopRadius — Circular loop radius in xy- plane
0.3100 (default) | scalar
Circular loop radius in xy- plane, specified as a scalar in meters.
Gap — Gap of loop in xy- plane
0.0400 (default) | scalar
Gap of loop in xy- plane, specified as a scalar in meters.
Conductor — Type of metal material
'PEC' (default) |
Type of the metal used as a conductor, specified as a metal material
object. You can choose any metal from the
MetalCatalog or specify a metal of your choice. For more
metal. For more information on metal conductor meshing, see
m = metal('Copper');
m = metal('Copper'); ant.Conductor =
Load — Lumped elements
[1x1 LumpedElement] (default) | lumped element object
Lumped elements added to the antenna feed, specified as the
comma-separated pair consisting of
'Load' and a lumped
element object. For more information, see
lumpedelement is the object for the load created
Tilt — Tilt angle of antenna
0 (default) | scalar | vector
Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.
TiltAxis=[0 1 0;0 1 1]
tilts the antenna at 90 degrees about the two axes defined by the
wireStack antenna object
only accepts the dot method to change its properties.
TiltAxis — Tilt axis of antenna
[1 0 0] (default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates |
Tilt axis of the antenna, specified as:
Three-element vector of Cartesian coordinates in meters. In this case, each coordinate in the vector starts at the origin and lies along the specified points on the X-, Y-, and Z-axes.
Two points in space, each specified as three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points in space.
A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'.
For more information, see Rotate Antennas and Arrays.
TiltAxis=[0 1 0]
TiltAxis=[0 0 0;0 1 0]
TiltAxis = 'Z'
wireStack antenna object only accepts the dot method to change its
|Display antenna, array structures or shapes|
|Display information about antenna or array|
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on antenna or array surface|
|Current distribution on antenna or array surface|
|Design prototype antenna or arrays for resonance around specified frequency|
|Radiation efficiency of antenna|
|Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays|
|Input impedance of antenna; scan impedance of array|
|Mesh properties of metal, dielectric antenna, or array structure|
|Change mesh mode of antenna structure|
|Optimize antenna or array using SADEA optimizer|
|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|
|Calculate and plot radar cross section (RCS) of platform, antenna, or array|
|Return loss of antenna; scan return loss of array|
|Calculate S-parameter for antenna and antenna array objects|
|Voltage standing wave ratio of antenna|
Default Cycloid Dipole
Create a default cycloid dipole antenna using the dipoleCycloid object and view it.
dc = dipoleCycloid
dc = dipoleCycloid with properties: Length: 1.2200 Width: 0.0508 LoopRadius: 0.3100 Gap: 0.0400 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
Impedance of Cycloid Dipole
Calculate the impedance of a cycloid dipole of width, 0.05 m, over a frequency span of 50 MHz - 100 MHz.
d = dipoleCycloid('Width',0.05); impedance(d,linspace(50e6,100e6,51))
Radiation Pattern of Cycloid Dipole
Plot the radiation pattern of a cycloid dipole of width,0.05 m, at a frequency of 48 MHz.
d = dipoleCycloid('Width',0.05)
d = dipoleCycloid with properties: Length: 1.2200 Width: 0.0500 LoopRadius: 0.3100 Gap: 0.0400 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
 Balanis, C.A. Antenna Theory: Analysis and Design. 3rd Ed. New York: Wiley, 2005.
 Volakis, John. Antenna Engineering Handbook. 4th Ed. New York: McGraw-Hill, 2007.
Introduced in R2017a