patchMicrostripElliptical

Create elliptical microstrip patch antenna

Description

The patchMicrostripElliptical object creates a probe-fed elliptical microstrip patch antenna. The default patch is centered at the origin. The ellipse is chosen for an operating frequency of around 5.45 GHz. Elliptical microstrip patch antennas are used in high-performance applications such as spacecraft, aircraft, missiles, and satellites. Elliptical microstrip patch antennas with optimum dimensions act as circularly polarized wave radiators.

Creation

Syntax

ant = patchMicrostripElliptical

ant = patchMicrostripElliptical(Name,Value)

Description

ant = patchMicrostripElliptical creates a probe-fed elliptical microstrip patch antenna operating at 5.45 GHz.

ant = patchMicrostripElliptical(Name,Value) sets properties using one or more name-value pairs. For example, ant = patchMicrostripElliptical('MajorAxis',0.0878) creates an elliptical microstrip patch antenna with a major axis of 0.0878 meters. Enclose each property name in quotes.

Properties

MajorAxis — Longest diameter of ellipse

0.0300 (default) | scalar

Longest diameter of the ellipse along the X-axis, specified as a scalar in meters.

Example: 'MajorAxis',0.0989

Example: ant.MajorAxis = 0.0989

Data Types: double

MinorAxis — Shortest diameter of ellipse

0.0200 (default) | scalar

Shortest diameter of the ellipse along the Y-axis, specified as a scalar in meters.

Example: 'MinorAxis',0.0898

Example: ant.MinorAxis = 0.0898

Data Types: double

Height — Height of patch

0.0016 (default) | scalar

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

Example: 'Height',0.001

Example: ant.Height = 0.001

Data Types: double

Substrate — Type of dielectric material

'Air' (default) | dielectric function handle

Type of dielectric material used as a substrate, specified as a dielectric material object handle. 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

GroundPlaneLength — Ground plane length

0.0450 (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: ant.GroundPlaneLength = 120e-3

Data Types: double

GroundPlaneWidth — Ground plane width

0.0450 (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: ant.GroundPlaneWidth = 120e-3

Data Types: double

PatchCenterOffset — Signed distance of patch from origin

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

Signed distance of the patch from the origin, 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. Distances are measured along the length and width of the ground plane.

Example: 'PatchCenterOffset',[0.01 0.01]

Example: ant.PatchCenterOffset = [0.01 0.01]

Data Types: double

FeedOffset — Signed distance of feed from origin

[0.0047 0.0045] (default) | two-element real vector

Signed distance of the feed from the origin, specified as a two-element real vector with each element unit in meters. Use this property to adjust the location of the feed relative to the ground plane and patch.

Example: 'FeedOffset',[0.01 0.01]

Example: ant.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: ant.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: ant.TiltAxis = 'Z'

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

Object Functions

show	Display antenna or array structure; display shape as filled patch
axialRatio	Axial ratio of antenna
beamwidth	Beamwidth of antenna
charge	Charge distribution on metal or dielectric antenna or array surface
current	Current distribution on metal or dielectric antenna or array surface
design	Design prototype antenna or arrays for resonance at 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 or 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
returnLoss	Return loss of antenna; scan return loss of array
sparameters	S-parameter object
vswr	Voltage standing wave ratio of antenna

Examples

Default Elliptical Microstrip Patch Antenna

Create and view a default elliptical microstrip patch antenna.

ant = patchMicrostripElliptical

ant = 
  patchMicrostripElliptical with properties:

            MajorAxis: 0.0300
            MinorAxis: 0.0200
               Height: 0.0016
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.0450
     GroundPlaneWidth: 0.0450
    PatchCenterOffset: [0 0]
           FeedOffset: [0.0047 0.0045]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

show (ant)

Visualize the radiation pattern of the antenna at 5.45 GHz.

pattern(ant,5.45e9)