Main Content

monocone

Create monocone antenna on circular ground plane

Since R2020a

expand all in page

Description

The default monocone object creates a monocone antenna on a circular ground plane resonating around 3.8 GHz. A classical monocone antenna consists of a cone and a ground plane. To increase the bandwidth of the antenna, you can modify the antenna by merging the cone with a circular cylinder. By default, the monocone object creates the modified version.

Create a classical monocone antenna (without the cylinder on top) using one of these methods:

  • Set the height of the antenna to equal the sum of the cone height and the feed height.

  • Set the cone height to equal half of the difference between the total height and the feed height. Then set the radius at the aperture to twice the radius at the junction.

Creation

Syntax

m = monocone
m = monocone(Name=Value)

Description

m = monocone creates a monocone antenna with default property values. The default dimensions are chosen for an operating frequency of around 3.8 GHz. The feed point of this antenna is located at the center of the ground plane.

example

m = monocone(Name=Value) sets properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1,...,NameN=ValueN. Properties that you do not specify, retain their default values.

For example, m = monocone(Height=0.0560) creates a monocone antenna with a total height of 0.0560 meters and default values for other properties.

example

Properties

expand all

Antenna radii, specified as a three-element real vector with each element unit in meters.

  • The first element represents the narrow radius of the cone.

  • The second element represents the radius at the junction of the cone and the cylinder.

  • The third element represents the radius at the top of the cylinder.

Example: [6.3300e-04 0.0546 0.0220]

Data Types: double

Total height of the antenna from the ground plane to the antenna aperture, specified as a positive scalar in meters.

Example: 0.0560

Data Types: double

Vertical height of the cone from the apex of the cone to the junction of the cone and the cylinder, specified as a positive scalar in meters.

Example: 0.02250

Data Types: double

Gap between the cone and the ground plane, specified as a positive scalar in meters.

Example: 0.0034

Data Types: double

Width of the feed, specified as a positive scalar in meters.

Example: 0.0050

Data Types: double

Radius of the ground plane, specified as a positive scalar in meters.

Example: 0.0050

Data Types: double

Type of the metal used as a conductor, specified as a metal object. You can choose any metal from the MetalCatalog or specify a metal of your choice. For more information on metal conductor meshing, see Meshing.

Example: metal("Copper")

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.

Example: Load=lumpedElement(Impedance=75)

Example: antenna.Load = lumpedElement(Impedance=75)

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

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

axialRatioCalculate and plot axial ratio of antenna or array
bandwidthCalculate and plot absolute bandwidth of antenna or array
beamwidthBeamwidth of antenna
chargeCharge distribution on antenna or array surface
coneangle2sizeCalculates equivalent cone height, broad radius, and narrow radius
currentCurrent distribution on antenna or array surface
designDesign prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects
efficiencyCalculate and plot radiation efficiency of antenna or array
EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrentCalculate current at feed for antenna or array
impedanceCalculate and plot input impedance of antenna or scan impedance of array
infoDisplay information about antenna, array, or platform
memoryEstimateEstimate memory required to solve antenna or array mesh
meshMesh properties of metal, dielectric antenna, or array structure
meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwriteWrite antenna or array analysis data to MSI planet file
optimizeOptimize antenna or array using SADEA optimizer
patternPlot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuthAzimuth plane radiation pattern of antenna or array
patternElevationElevation plane radiation pattern of antenna or array
peakRadiationCalculate and mark maximum radiation points of antenna or array on radiation pattern
rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequencyCalculate and plot resonant frequency of antenna
returnLossCalculate and plot return loss of antenna or scan return loss of array
showDisplay antenna, array structures, shapes, or platform
sparametersCalculate S-parameters for antenna or array
stlwriteWrite mesh information to STL file
vswrCalculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

collapse all

Open Live Script

Create and view a default monocone antenna.

ant = monocone
ant = 
  monocone with properties:

                Radii: [5.0000e-04 0.0110 0.0110]
    GroundPlaneRadius: 0.0325
           ConeHeight: 0.0115
               Height: 0.0250
           FeedHeight: 5.0000e-04
            FeedWidth: 5.0000e-04
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]


show(ant)

Figure contains an axes object. The axes object with title monocone antenna element, xlabel x (mm), ylabel y (mm) contains 4 objects of type patch, surface. These objects represent PEC, feed.

Open Live Script

Create a monocone antenna with an infinite ground plane.

ant = monocone;
ant.GroundPlaneRadius = inf;
show(ant)

Figure contains an axes object. The axes object with title monocone over infinite ground plane, xlabel x (mm), ylabel y (mm) contains 4 objects of type patch, surface. These objects represent PEC, feed, infinite ground.

Plot the radiation pattern of the monocone antenna for the given frequency.

pattern(ant,3.94e9)

Figure contains 2 axes objects and other objects of type uicontrol. Axes object 1 contains 4 objects of type patch, surface. This object represents infinite ground. Hidden axes object 2 contains 17 objects of type surface, line, text, patch. This object represents infinite ground.

Open Live Script

Create a classical monocone antenna by setting the total height of the antenna to equal the sum of cone height and feed height.

ant = monocone;
ant.Height = ant.ConeHeight+ant.FeedHeight;
show(ant)

Figure contains an axes object. The axes object with title monocone antenna element, xlabel x (mm), ylabel y (mm) contains 4 objects of type patch, surface. These objects represent PEC, feed.

Calculate antenna impedance over the given frequency span.

impedance(ant,(1e9:0.1e9:6e9))

Figure contains an axes object. The axes object with title Impedance, xlabel Frequency (GHz), ylabel Impedance (ohms) contains 2 objects of type line. These objects represent Resistance, Reactance.

References

[1] McDonald, James L., and Dejan S. Filipovic. “On the Bandwidth of Monocone Antennas.” IEEE Transactions on Antennas and Propagation 56, no. 4 (April 2008): 1196–1201. https://doi.org/10.1109/TAP.2008.919226.

Version History

Introduced in R2020a

See Also

Objects

Topics