monopoleRadial

Create monopole antenna mounted on radial ground plane

Since R2020b

Description

The default monopoleRadial object creates a monopole antenna mounted on a radial ground plane resonating around 75 MHz. 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 default 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 xy-plane. The default dimensions are chosen for an operating frequency of around 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 in degrees, specified as a scalar or vector. For more information, see Rotate Antennas and Arrays.

Example: 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.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

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.

• "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Object Functions

axialRatio	Calculate and plot axial ratio of antenna or array
bandwidth	Calculate and plot absolute bandwidth of antenna or array
beamwidth	Beamwidth of antenna
current	Current distribution on antenna or array surface
charge	Charge distribution on antenna or array surface
design	Design prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects
efficiency	Calculate and plot radiation efficiency of antenna or array
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrent	Calculate current at feed for antenna or array
impedance	Calculate and plot input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwrite	Write antenna or array analysis data to MSI planet file
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
peakRadiation	Calculate and mark maximum radiation points of antenna or array on radiation pattern
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and plot resonant frequency of antenna
returnLoss	Calculate and plot return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antenna or array
stlwrite	Write mesh information to STL file
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

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