Create J-dipole antenna
dipoleJ object to create a J-dipole on the
yz-plane. The antenna contains a half-wavelength radiator and a
quarter-wavelength stub. The default antenna dimensions are set for an operating
frequency of 144MHz.
J-dipole antenna at an operating frequency of 144MHz.
jdipole = dipoleJ
creates a J-dipole antenna with additional Properties
specified by one or more name-value arguments.
jdipole = dipoleJ(Name=Value)
the property name and
Value is the corresponding value.
You can specify several name-value pair arguments in any order as
NameN=ValueN. Properties that you do not specify
retain their default values.
RadiatorLength — Radiator length
0.9970 (default) | positive scalar
Radiator length, specified as a positive scalar in meters.
StubLength — Parallel line stub length
0.4997 (default) | positive scalar
Parallel line stub length, specified as a positive scalar in meters.
Width — Strip width
0.0200 (default) | positive scalar
Strip width, specified as a positive scalar in meters.
Spacing — Space between the stub and radiator
0.0460 (default) | positive scalar
Space between the parallel line stub and the radiator, specified as a scalar in meters.
FeedOffset — Signed distance to feed from base of stub on large arm
0.0490 (default) | scalar
Signed distance to the feed from the base of stub on the large arm, specified as a scalar in meters.
Conductor — Type of metal material
"PEC" (default) |
Load — Lumped elements
lumpedElement] (default) | lumped element object
Lumped elements added to the antenna feed, specified as a lumped element
object. You can add a load anywhere on the surface of the antenna. By
default, the load is at the origin. For more information, see
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]
|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|
|Display information about antenna or 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|
|Display antenna, array structures, shapes, or platform|
|Calculate S-parameters for antennas and antenna arrays|
|Voltage standing wave ratio (VSWR) of antenna or array element|
Default J-Dipole Antenna
Create and view a default J-dipole antenna.
d = dipoleJ
d = dipoleJ with properties: RadiatorLength: 0.9970 StubLength: 0.4997 Spacing: 0.0460 Width: 0.0200 FeedOffset: -0.6994 Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
Impedance of J-Dipole Antenna
Create and view a J-dipole antenna with the following specifications:
Radiator length = 0.978 m
Stub length = 0.485 m
FeedOffset = 0.049 m
dj = dipoleJ(RadiatorLength=0.978, StubLength=0.485, ... FeedOffset=0.070); show(dj)
Calculate the impedance of the antenna over a frequency span 140MHz - 150MHz.
Introduced in R2018a