Create customized monopole antenna
monopoleCustom object creates a monopole radiator of any
shape using the
antenna.Shape class. The ground plane can take any shape. You
can create any arbitrarily shaped monopole and analyze it for field, surface, and port
characteristics. Monopole antennas have a simple structure and provide omnidirectional
radiation patterns with wide impedance bandwidth. Monopole antennas are commonly used in
airborne and ground-based communication systems.
creates a default
monopole antenna with a square radiator and a circular ground plane. The feed point is
at the origin in the xy- plane. The default antenna resonates at an
operating frequency of 1.24 GHz.
ant = monopoleCustom
Properties using one or more
name-value pairs. For example,
ant = monopoleCustom(Name,Value)
monopoleCustom('RadiatorTilt',90) creates a monopole antenna with tilt angle
of the radiator at 90 degrees on the z-axis.
Radiator— Type of radiator
antenna.Rectangleobject (default) |
Type of radiator, specified as an
antenna.Polygon object. You can
specify any shape for the radiator. The feed strip is a part of the radiator. By
default, the radiator is square in shape with a side length of 40e-3 meters. The feed
strip is 2e-3 meters in length and 2.5e-3 meters in width at the edge of the
GroundPlane— Type of ground plane
Type of ground plane, specified as an
antenna.Polygon object. You
can specify any shape for the ground plane. By default, the ground plane is circular in
shape with a radius of 150e-3 meters.
FeedOffset— Signed distance from center along length and width of ground plane
[0 0](default) | two-element vector
Signed distance from the center along the length and the width of the ground plane, specified as a two-element vector in meters.
RadiatorTilt— Tilt angle of radiator
0(default) | scalar
Tilt angle of the radiator, specified as a scalar in degrees.
Conductor— Type of metal material
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 information, see
more information on metal conductor meshing, see Meshing.
m = metal('Copper'); 'Conductor',m
m = metal('Copper'); ant.Conductor = m
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.
ant.Tilt = 90
'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 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]
ant.TiltAxis = 'Z'
Load— Lumped elements
lumpedElement] (default) |
Lumped elements added to the antenna feed, specified as a
lumpedElement object. You can add a load anywhere on the surface of
the antenna. By default, the load is at the feed. For more information, see
the object for the load created using
ant.Load = lumpedElement('Impedance',75)
|Display antenna or array structure; display shape as filled patch|
|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|
|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 or dielectric antenna or array structure|
|Optimize antenna or array using SADEA optimizer|
|Display antenna radiation pattern in Site Viewer|
|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|
Create a disc monopole with a of radius 25 mm, on a square ground plane of 30 cm, and with a feed gap of 0.7 mm.
Rad = antenna.Circle('Radius',25e-3); FeedStrip = antenna.Rectangle('Length',1e-3,'Width',0.7e-3, ... 'Center',[0 -(Rad.Radius+(0.7e-3)*0.3)]); m = monopoleCustom; m.Radiator = Rad+FeedStrip; m.GroundPlane = antenna.Rectangle('Length',300e-3,'Width',300e-3);
View the antenna using the
Plot the radiation pattern of the antenna at 2.05 GHz.
p = PatternPlotOptions('MagnitudeScale',[-40 5]); pattern(m,2.05e9,'patternOptions',p);
 Ammann, M. J. “Square Planar Monopole Antenna.” IEE National Conference on Antennas and Propagation, vol. 1999, IEE, pp. 37–40.
 Weiner, M. “Monopole Element at the Center of a Circular Ground Plane Whose Radius Is Small or Comparable to a Wavelength.” IEEE Transactions on Antennas and Propagation, vol. 35, no. 5, pp. 488–495.
 N. P. Agrawall, G. Kumar and K. P. Ray, "Wide-band planar monopole antennas," in IEEE Transactions on Antennas and Propagation, vol. 46, no. 2, pp. 294-295.