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patchMicrostripCircular

Create probe-fed circular microstrip patch antenna

Description

Use the patchMicrostripCircular object to create a probe-fed circular microstrip patch antenna. By default, the patch is centered at the origin with feed point along the radius and the groundplane on the X-Y plane at z = 0.

Circular microstrip antennas are used as low-profile antennas in airborne and spacecraft applications. These antennas also find use in portable wireless applications because they are lightweight, low cost, and easily manufacturable.

Creation

Syntax

circularpatch = patchMicrostripCircular
circularpatch = patchMicrostripCircular(Name,Value)

Description

example

circularpatch = patchMicrostripCircular creates a probe-fed circular microstrip patch antenna.

example

circularpatch = patchMicrostripCircular(Name,Value) sets properties using one or more name-value pairs. For example, circularpatch = patchMicrostripCircular('Radius',0.2) creates a circular patch of radius 0.2 m. Enclose each property name in quotes.

Properties

expand all

Patch radius, specified as a scalar in meters. The default radius is for an operating frequency of 1 GHz.

Example: 'Radius',0.2

Example: circularpatch.Radius = 0.2

Data Types: double

Height of patch above the ground plane along the Z-axis, specified as a scalar in meters.

Example: 'Height',0.001

Example: circularpatch.Height = 0.001

Data Types: double

Ground plane length along the X-axis, specified as a scalar in meters. Setting 'GroundPlaneLength' to Inf, uses the infinite ground plane technique for antenna analysis.

Example: 'GroundPlaneLength',120e-3

Example: circularpatch.GroundPlaneLength = 120e-3

Data Types: double

Ground plane width along the Y-axis, specified as a scalar in meters. Setting 'GroundPlaneWidth' to Inf, uses the infinite ground plane technique for antenna analysis.

Example: 'GroundPlaneWidth',120e-3

Example: circularpatch.GroundPlaneWidth = 120e-3

Data Types: double

Type of dielectric material used as a substrate, specified as a dielectric material object handle. For more information see, dielectric. For more information on dielectric substrate meshing, see Meshing.

Note

The substrate dimensions must be lesser than the groundplane dimensions.

Example: d = dielectric('FR4'); 'Substrate',d

Example: d = dielectric('FR4'); circularpatch.Substrate = d

Signed distance from center along length and width of ground plane, specified as a two-element real vector with each element units in meters. Use this property to adjust the location of the patch relative to the ground plane.

Example: 'PatchCenterOffset',[0.01 0.01]

Example: circularpatch.PatchCenterOffset = [0.01 0.01]

Data Types: double

Signed distance from center along length and width of ground plane, specified as a two-element real vector with each element units in meters. Use this property to adjust the location of the feedpoint relative to the ground plane and patch.

Example: 'FeedOffset',[0.01 0.01]

Example: circularpatch.FeedOffset = [0.01 0.01]

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. For more information, see lumpedElement.

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

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

Tilt angle of antenna, specified as a scalar or vector with each element units in degrees.

Example: 'Tilt',90

Example: circularPatch.Tilt = [90 90 0]

Data Types: double

Tilt axis of the antenna, specified as:

  • A three-element vector 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 axis.

  • Two points in space as three-element vectors of Cartesian coordinates. In this case, the antenna rotates along the line joining the two points.

  • A string input for simple rotations around the principal planes, X, Y, or Z.

For more information see, Rotate Antenna and Arrays

Example: 'TiltAxis',[0 1 0]

Example: circularpatch.TiltAxis = [0 0 0;0 1 0]

Example: 'TiltAxis','Z'

Data Types: double

Object Functions

showDisplay antenna or array structure; Display shape as filled patch
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 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 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

expand all

Create and view a default circular microstrip patch.

cp = patchMicrostripCircular
cp = 
  patchMicrostripCircular with properties:

               Radius: 0.0798
               Height: 0.0060
            Substrate: [1×1 dielectric]
    GroundPlaneLength: 0.3000
     GroundPlaneWidth: 0.3000
    PatchCenterOffset: [0 0]
           FeedOffset: [-0.0525 0]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1×1 lumpedElement]

show(cp)

Create a circular patch antenna with radius 79.8 mm over a 300 mm by 300 mm ground plane, and offset the feed by (-52.5mm,0). Display the antenna.

cp = patchMicrostripCircular('Radius',0.0798,'Height',6e-3,...
       'GroundPlaneLength',0.3,'GroundPlaneWidth',0.3,...
       'FeedOffset',[-0.0525 0]);
   
show(cp)   

Plot the pattern of the patch antenna at 1 GHz.

pattern(cp,1e9);

Calculate the impedance of the antenna over a frequency span of 0.5GHz to 1.5GHz.

f = linspace(0.5e9,1.5e9,61);
impedance(cp,f);

Introduced in R2017b

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