monocone

Create monocone antenna on circular ground plane

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(PropertyName=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.

m = monocone(PropertyName=Value) sets properties using one or more name-value arguments. PropertyName is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as PropertyName1=Value1,...,PropertyNameN=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.

Properties

Radii — Antenna radii

[5.0000e-04 0.0110 0.0110] (default) | three-element real vector

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

Height — Total height of antenna

0.0250 (default) | positive scalar

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

ConeHeight — Vertical height of cone

0.0115 (default) | positive scalar

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

FeedHeight — Gap between cone and ground plane

5.0000e-04 (default) | positive scalar

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

Example: 0.0034

Data Types: double

FeedWidth — Width of feed

5.0000e-04 (default) | positive scalar

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

Example: 0.0050

Data Types: double

GroundPlaneRadius — Radius of ground plane

0.0325 (default) | positive scalar

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

Example: 0.0050

Data Types: double

Conductor — Type of metal

metal("PEC") (default) | metal object

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")

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.

Example: 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
charge	Charge distribution on antenna or array surface
coneangle2size	Calculates equivalent cone height, broad radius, and narrow radius
current	Current distribution on antenna or array surface
design	Create antenna, array, or AI-based antenna resonating at specified frequency
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	Generate and view mesh for antennas, arrays, and custom shapes
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 and array catalog elements using SADEA or TR-SADEA algorithm
pattern	Plot radiation pattern of antenna, array, or embedded element of 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

Default Monocone Antenna

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: [1×1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1×1 lumpedElement]

show(ant)

Monocone Antenna with Infinite Ground Plane

Create a monocone antenna with an infinite ground plane.

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

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

pattern(ant,3.94e9)

Monocone Antenna Without A Cylinder

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)

Calculate antenna impedance over the given frequency span.

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

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