Create folded dipole antenna
dipolefolded object is a folded dipole antenna on the
The width of the dipole is related to the diameter of an equivalent cylindrical dipole by the equation
d is the diameter of the equivalent cylindrical pole
r is the radius of the equivalent cylindrical pole.
For a given cylinder radius, use the
cylinder2strip utility function to calculate the equivalent width. The
default folded dipole is center-fed. The feed point of the dipole coincides with the
origin. The origin is located on the xy- plane. When compared to the
dipole, the folded dipole structure increases the input impedance
of the antenna.
half-wavelength folded dipole antenna.
dF = dipoleFolded
creates a half-wavelength folded dipole antenna with additional properties
specified by one or more name-value pair arguments.
dF = dipoleFolded(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 — Folded dipole length
2 (default) | scalar
Folded dipole length, specified as a scalar in meters. By default, the length is chosen for an operating frequency of 70.5 MHz.
Width — Folded dipole width
0.0040 (default) | scalar
Folded dipole width, specified as a scalar in meters.
Folded dipole width should be less than
and greater than
Spacing — Shorting stub lengths at dipole ends
0.0245 (default) | scalar
Shorting stub lengths at dipole ends, specified as a scalar in meters. The
value must be less than
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 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 in degrees, specified as a scalar or vector. 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
TiltAxis — Tilt axis of antenna
[1 0 0] (default) | three-element vector | 2-by-3 matrix |
Tilt axis of the antenna, specified as one of these values:
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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points.
"z"to describe a rotation about the x-, y-, or z-axis, respectively.
For more information, see Rotate Antennas and Arrays.
[0 1 0]
[0 0 0;0 1 0]
|Display antenna, array structures, shapes, or platform|
|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 or create AI-based antenna from antenna catalog objects|
|Radiation efficiency of antenna|
|Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays|
|Input impedance of antenna or scan impedance of array|
|Mesh properties of metal, dielectric antenna, or array structure|
|Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry|
|Optimize antenna or array using SADEA optimizer|
|Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array|
|Azimuth plane radiation pattern of antenna or array|
|Elevation plane radiation pattern of antenna or array|
|Calculate and plot radar cross section (RCS) of platform, antenna, or array|
|Return loss of antenna or scan return loss of array|
|Calculate S-parameters for antennas and antenna arrays|
|Voltage standing wave ratio (VSWR) of antenna or array element|
Create and View Folded Dipole Antenna
Create and view a folded dipole with 2 m length and 0.05 m width.
df = dipoleFolded('Length',2,'Width',0.05)
df = dipoleFolded with properties: Length: 2 Width: 0.0500 Spacing: 0.0245 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
Radiation Pattern of Folded Dipole Antenna
Plot the radiation pattern of a folded dipole at 70.5 MHz.
df = dipoleFolded
df = dipoleFolded with properties: Length: 2 Width: 0.0180 Spacing: 0.0245 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 R2015a