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

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

expand all

Number of petals, specified as a scalar.

Example: 'NumPetals',4

Example: cl.NumPetals = 4

Data Types: double

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

Example: 'PetalLength',0.0025

Example: cl.PetalLength = 0.0025

Data Types: double

Leaf strip width, specified as a scalar in meters.

Example: 'PetalWidth',0.001

Example: cl.PetalWidth = 0.001

Data Types: double

Leaf flare angle, specified as a scalar in degrees.

Example: 'FlareAngle',100

Example: cl.FlareAngle = 100

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. 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 handle for the load created using lumpedElement.

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

Data Types: double

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 degree about two axes, defined by vectors.

Data Types: double

Tilt axis of the antenna, specified as:

  • Three-element vectors of Cartesian coordinates in meters. In this case, each 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: ant.TiltAxis = 'Z'

Object Functions

showDisplay antenna or array structure; Display shape as filled patch
infoDisplay information about antenna or array
axialRatioAxial ratio of antenna
beamwidthBeamwidth of antenna
chargeCharge distribution on metal or dielectric antenna or array surface
currentCurrent distribution on metal or dielectric antenna or array surface
designDesign prototype antenna or arrays for resonance at specified frequency
EHfieldsElectric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
impedanceInput impedance of antenna; scan impedance of array
meshMesh properties of metal or dielectric antenna or array structure
meshconfigChange mesh mode of antenna structure
patternRadiation pattern and phase of antenna or array; Embedded pattern of antenna element in array
patternAzimuthAzimuth pattern of antenna or array
patternElevationElevation pattern of antenna or array
returnLossReturn loss of antenna; scan return loss of array
sparametersS-parameter object
vswrVoltage standing wave ratio of antenna

Examples

collapse all

Create and view a default cloverleaf antenna.

cl = cloverleaf
cl = 
  cloverleaf with properties:

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

show(cl)

Create a cloverleaf antenna.

cl = cloverleaf;
show(cl);

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

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

You can see from the axial ratio plot that the antenna supports circular polarization over the entire frequency range.

Introduced in R2017b