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 X-Y plane. When compared to the planar
dipole, the folded dipole structure increases the input impedance of
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
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
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
Shorting stub lengths at dipole ends, specified as a scalar in meters. The
value must be less than
Load— Lumped elements
Lumped elements added to the antenna feed, specified a lumped element
object handle. For more information, see
lumpedelement is the object handle for the load
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 degree about two axes, defined by vectors.
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 vectors of Cartesian coordinates in meters. In this case, each 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]
ant.TiltAxis = 'Z'
|Display antenna or array structure; Display shape as filled patch|
|Display information about antenna or array|
|Axial ratio of antenna|
|Beamwidth of antenna|
|Charge distribution on metal or dielectric antenna or array surface|
|Current distribution on metal or dielectric antenna or array surface|
|Design prototype antenna or arrays for resonance at specified frequency|
|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 or 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|
|Return loss of antenna; scan return loss of array|
|Voltage standing wave ratio of antenna|
Create and view a folded dipole with 2m length and 0.05m width.
df = dipoleFolded('Length',2,'Width',0.05)
df = dipoleFolded with properties: Length: 2 Width: 0.0500 Spacing: 0.0245 Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
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 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.