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 xy- 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

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

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

Radius — Patch radius

0.0798 (default) | scalar

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 — Height of patch

0.0060 (default) | scalar

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

GroundPlaneLength — Ground plane length

0.3000 (default) | scalar

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

GroundPlaneWidth — Ground plane width

0.3000 (default) | scalar

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

Substrate — Type of dielectric material

'Air' (default) | dielectric function

Type of dielectric material used as a substrate, specified as a dielectric material object. You can choose any material from the DielectricCatalog or use your own dielectric material. For more information, see dielectric. For more information on dielectric substrate meshing, see Meshing.

Note

The substrate dimensions must be lesser than the ground plane dimensions.

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

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

PatchCenterOffset — Signed distance from center along length and width of ground plane

[0 0] (default) | two-element real vector

Signed distance from center along length and width of ground plane, specified as a two-element real vector with each element unit 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

FeedOffset — Signed distance from center along length and width of ground plane

[–0.0525 0] (default) | two-element real vector

Signed distance from center along length and width of ground plane, specified as a two-element real vector with each element unit 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

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) | 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. For more information, see lumpedElement.

Example: 'Load',lumpedElement, where lumpedElement is load added to the antenna feed.

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

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
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

Circular Microstrip Patch

Create and view a default circular microstrip patch.

cp = patchMicrostripCircular

cp = 
  patchMicrostripCircular with properties:

               Radius: 0.0798
               Height: 0.0060
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.3000
     GroundPlaneWidth: 0.3000
    PatchCenterOffset: [0 0]
           FeedOffset: [-0.0525 0]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

show(cp)

Radiation Pattern and Impedance of Circular Microstrip Patch

Create a circular patch antenna using given values. 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 0.5 GHz to 1.5 GHz.

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

Version History

Introduced in R2017b