monopoleRadial

Create monopole antenna mounted on radial ground plane

Since R2020b

Description

The monopoleRadial antenna object creates a monopole antenna mounted on a radial ground plane. The monopole radial antenna is a variant of the monopole antenna, where the antenna is mounted on radials as versus a rectangular ground plane. These antennas are commonly used in airborne and ground-based radio communications.

Creation

Syntax

mpr = monopoleRadial

mpr = monopoleRadial(Name,Value)

Description

mpr = monopoleRadial creates a quarter wavelength monopole antenna with a radial ground plane. The default antenna object is center-fed with the feed point located at the origin on the X-Y plane. The default antenna object resonates at 75 MHz.

mpr = monopoleRadial(Name,Value) sets Properties using name-value pairs. For example, monopoleRadial('Height',2.2) creates a monopole antenna mounted on a radial ground plane with height of 2.2 meters. You can specify multiple name-value pairs. Enclose each property name in quotes. Properties not specified retain their default values.

Properties

Height — Monopole height

1 (default) | positive scalar

Monopole height, specified as a positive scalar in meter.

Example: 'Height',3

Data Types: double

Width — Monopole width

0.1000 (default) | positive scalar

Monopole width, specified as a positive scalar in meters.

Note

Monopole width should be less than 'Height'/4 and greater than 'Height'/1001. For more information, see [2].

Example: 'Width',0.05

Data Types: double

NumRadials — Number of radials

12 (default) | positive scalar

Number of radials, specified as a positive scalar.

Example: 'NumRadials',14

Data Types: double

RadialWidth — Width of each radial

0.02 (default) | positive scalar

Width of each radial in the monopole radial antenna, specified as a positive scalar in meters.

Example: 'RadialWidth',0.05

Data Types: double

RadialLength — Length of each radial

2.85 (default) | positive scalar

Length of each radial in the monopole radial antenna, specified as a positive scalar in meters.

Example: 'RadialLength',3.13

Data Types: double

RadialTilt — Tilt angle of radials with respect to ground plane

0 (default) | scalar

Tilt angle of radials with respect to the ground plane, specified as a scalar in degree. Radials are tilted along the X-Y plane in negative Z direction.

Example: 'RadialTilt',10

Data Types: double

Conductor — Type of metal material

'PEC' (default) | metal object

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 metal. For more information on metal conductor meshing, see Meshing.

Example: m = metal('Copper'); 'Conductor',m

Example: m = metal('Copper'); ant.Conductor = m

Load — Lumped elements

[1x1 lumpedElement] (default) | lumpedElement object

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 lumpedElement.

Example: 'Load',lumpedelement, where lumpedelement is the load added to the antenna feed.

Example: ant.Load = lumpedElement('Impedance',75)

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.

Example: Tilt=90

Example: Tilt=[90 90],TiltAxis=[0 1 0;0 1 1] tilts the antenna at 90 degrees about the two axes defined by the vectors.

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates | 'X' | 'Y' | 'Z'

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.

Example: TiltAxis=[0 1 0]

Example: TiltAxis=[0 0 0;0 1 0]

Example: TiltAxis = 'Z'

Data Types: double

Object Functions

show	Display antenna, array structures or shapes
impedance	Input impedance of antenna; scan impedance of array
sparameters	Calculate S-parameter for antenna and antenna array objects
returnLoss	Return loss of antenna; scan return loss of array
vswr	Voltage standing wave ratio of antenna
optimize	Optimize antenna or array using SADEA optimizer
pattern	Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array
patternAzimuth	Azimuth pattern of antenna or array
patternElevation	Elevation pattern of antenna or array
axialRatio	Axial ratio of antenna
beamwidth	Beamwidth of antenna
current	Current distribution on antenna or array surface
charge	Charge distribution on antenna or array surface
efficiency	Radiation efficiency of antenna
EHfields	Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
mesh	Mesh properties of metal, dielectric antenna, or array structure
design	Design prototype antenna or arrays for resonance around specified frequency
rcs	Calculate and plot radar cross section (RCS) of platform, antenna, or array

Examples

Design Monopole Radial Antenna with Default Properties

Create and view a monopole antenna mounted on radial ground plane with default properites.

ant = monopoleRadial;
show(ant)

Plot Radiation Pattern of Monopole Radial Antenna

Create and view a monopole antenna on a radial ground plane with the width of 0.0067 meters and the height of 0.33331 meters.

 m = monopoleRadial('Width',0.0067,'Height',0.3331);
 show(m)

Plot the radiation pattern of the antenna at a frequency of 225 MHz.

pattern(m,225e6)

References

[1] Balanis, Constantine A. Antenna Theory: Analysis and Design. 3rd ed. Hoboken, NJ: John Wiley, 2005.

[2] Volakis, John. Antenna Engineering Handbook, 4th Ed. New York: Mcgraw-Hill, 2007.

Version History

Introduced in R2020b