patchMicrostripElliptical

Create regular or AI-based elliptical microstrip patch antenna

Since R2020a

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 a resonance 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.

You can perform full-wave EM solver based analysis on the regular patchMicrostripElliptical antenna or you can create a patchMicrostripElliptical type AIAntenna and explore the design space to tune the antenna for your application using AI-based analysis.

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 additional Properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1, ..., NameN=ValueN. Properties that you do not specify retain their default values.

For example, ant = patchMicrostripElliptical(MajorAxis=0.0878) creates an elliptical microstrip patch antenna with a major axis of 0.0878 meters.

• You can also create a patchMicrostripElliptical antenna resonating at a desired frequency using the design function.

• You can also create a patchMicrostripElliptical antenna from a microstrip patch type AIAntenna object using the exportAntenna function.

• A patchMicrostripElliptical type AIAntenna has some common tunable properties with a regular patchMicrostripElliptical antenna for AI-based analysis. Other properties of the regular patchMicrostripElliptical antenna are retained as read-only in its AIAntenna equivalent. To find the upper and lower bounds of the tunable properties, use tunableRanges function.

Properties

MajorAxis — Major axis length

0.0300 (default) | positive scalar | tunable for patchMicrostripElliptical type AIAntenna

Major axis length of the ellipse, specified as a scalar in meters. Conventionally, the major axis length is specified along the x-axis. This property is tunable for patchMicrostripElliptical type AIAntenna object created using the design function.

Example: 0.0989

Data Types: double

MinorAxis — Minor axis length

0.0200 (default) | positive scalar | tunable for patchMicrostripElliptical type AIAntenna

Minor axis length of the ellipse along the y-axis, specified as a scalar in meters. Conventionally, the minor axis length is specified along the y-axis. This property is tunable for patchMicrostripElliptical type AIAntenna object created using the design function.

Example: 0.0898

Data Types: double

Height — Patch height

0.0016 (default) | positive scalar | tunable for patchMicrostripElliptical type AIAntenna

Patch height above the ground plane along the z-axis, specified as a scalar in meters. This property is tunable for patchMicrostripElliptical type AIAntenna object created using the design function.

Example: 0.001

Data Types: double

Substrate — Type of dielectric material

"Air" (default) | dielectric object

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 less than the ground plane dimensions.

Example: dielectric("FR4")

GroundPlaneLength — Ground plane length

0.0450 (default) | positive 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: 120e-3

Data Types: double

GroundPlaneWidth — Ground plane width

0.0450 (default) | positive 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: 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: [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: [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: metal("Copper")

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: lumpedElement(Impedance=75)

Tilt — Tilt angle of antenna

0 (default) | scalar | vector

Tilt angle of the antenna in degrees, specified as a scalar or vector. For more information, see Rotate Antennas and Arrays.

Example: 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.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

Tilt axis of the antenna, specified as one of these values:

• 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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points.

• "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Object Functions

axialRatio	Calculate and/or plot axial ratio of antenna or array
bandwidth	Calculate and/or plot absolute bandwidth 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 or create AI-based antenna from antenna catalog objects
efficiency	Radiation efficiency of antenna
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
impedance	Input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and/or plot resonant frequency of antenna
returnLoss	Return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antennas and antenna arrays
vswr	Voltage standing wave ratio (VSWR) of antenna or array element

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)

Create AI Model Based Elliptical Microstrip Patch Antenna

This example shows how to create an AI model based elliptical microstrip patch antenna at 5.45 GHz and calculate its resonant frequency.

pAI = design(patchMicrostripElliptical,5.45e9,ForAI=true)

pAI = 
  AIAntenna with properties:

   Antenna Info
               AntennaType: 'patchMicrostripElliptical'
    InitialDesignFrequency: 5.4500e+09

   Tunable Parameters
                 MajorAxis: 0.0303
                 MinorAxis: 0.0263
                    Height: 0.0024

Use 'showReadOnlyProperties(pAI)' to show read-only properties

Vary its major and minor axis length and calculate its resonant frequency.

pAI.MajorAxis = 0.032;
pAI.MinorAxis = 0.0285;
resonantFrequency(pAI)

ans = 5.1807e+09

Convert the AIAntenna to a regular elliptical microstrip patch.

pmC = exportAntenna(pAI)

pmC = 
  patchMicrostripElliptical with properties:

            MajorAxis: 0.0320
            MinorAxis: 0.0285
               Height: 0.0024
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.0578
     GroundPlaneWidth: 0.0578
    PatchCenterOffset: [0 0]
           FeedOffset: [0.0103 0.0044]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

Version History

Introduced in R2020a

R2023b: AI model based antenna analysis

Design, tune, and analyze this antenna using an AI model. Using AI-based antenna models over conventional full-wave solvers significantly reduces the simulation time required to fine-tune the antenna to meet your design goals. Set the ForAI argument in the design function to true to create a patchMicrostripElliptical type AIAntenna. To use this feature, you need license to the Statistics and Machine Learning Toolbox™ in addition to the Antenna Toolbox™.