cloverleaf

Create three-petal cloverleaf antenna

Description

Use the cloverleaf object to create a three-petal cloverleaf antenna. The default cloverleaf has 3 petals and operates at around 5.8 GHz. It has a wideband circular polarization and an omnidirectional antenna.

Creation

Syntax

cl = cloverleaf

cl = cloverleaf(Name,Value)

Description

example

cl = cloverleaf creates a three-petal cloverleaf antenna.

cl = cloverleaf(Name,Value) sets properties using one or more name-value pairs. For example, cl = cloverleaf('NumPetals',4) creates a five-petal cloverleaf antenna. Enclose each property name in quotes.

Properties

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`NumPetals` — Number of petals
`3` (default) | scalar

Number of petals, specified as a scalar.

Example: 'NumPetals',4

Example: cl.NumPetals = 4

Data Types: double

`PetalLength` — Total length of leaf
`0.0515` (default) | scalar

Total length of leaf, specified as a scalar in meters.

Example: 'PetalLength',0.0025

Example: cl.PetalLength = 0.0025

Data Types: double

`PetalWidth` — Leaf strip width
`8.0000e-04` (default) | scalar

Leaf strip width, specified as a scalar in meters.

Example: 'PetalWidth',0.001

Example: cl.PetalWidth = 0.001

Data Types: double

`FlareAngle` — Leaf flare angle
`105` (default) | scalar

Leaf flare angle, specified as a scalar in degrees.

Example: 'FlareAngle',100

Example: cl.FlareAngle = 100

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) | lumped element object

Lumped elements added to the antenna feed, specified as a lumped element object. You can add a load anywhere on the surface of the antenna. By default, it is at the origin. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object for the load created using lumpedElement.

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

Data Types: double

`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
`info`	Display information about antenna or array
`axialRatio`	Axial ratio of antenna
`beamwidth`	Beamwidth of antenna
`charge`	Charge distribution on antenna or array surface
`current`	Current distribution on antenna or array surface
`design`	Design prototype antenna or arrays for resonance around specified frequency
`efficiency`	Radiation efficiency of antenna
`EHfields`	Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
`impedance`	Input impedance of antenna; scan impedance of array
`mesh`	Mesh properties of metal, dielectric antenna, or array structure
`meshconfig`	Change mesh mode of antenna structure
`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
`rcs`	Calculate and plot radar cross section (RCS) of platform, antenna, or array
`returnLoss`	Return loss of antenna; scan return loss of array
`sparameters`	Calculate S-parameter for antenna and antenna array objects
`vswr`	Voltage standing wave ratio of antenna

Examples

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Clover Leaf Antenna

Open Live Script

Create and view a default cloverleaf antenna.

cl = cloverleaf

cl = 
  cloverleaf with properties:

      NumPetals: 3
    PetalLength: 0.0515
     PetalWidth: 8.0000e-04
     FlareAngle: 105
      Conductor: [1x1 metal]
           Tilt: 0
       TiltAxis: [1 0 0]
           Load: [1x1 lumpedElement]

show(cl)

Figure contains an axes object. The axes object with title cloverleaf antenna element, xlabel x (mm), ylabel y (mm) contains 10 objects of type patch, surface. These objects represent PEC, feed.

Axial Ratio of Cloverleaf Antenna

Open Live Script

Create a cloverleaf antenna.

cl = cloverleaf;
show(cl);

Figure contains an axes object. The axes object with title cloverleaf antenna element, xlabel x (mm), ylabel y (mm) contains 10 objects of type patch, surface. These objects represent PEC, feed.

Plot the axial ratio of the antenna from 5 GHz to 6 GHz.

freq = linspace(5e9,6e9,101);
axialRatio(cl,freq,0,0);

Figure contains an axes object. The axes object with title Axial ratio, xlabel Frequency (GHz), ylabel Axial ratio (dB) contains an object of type line.