patchMicrostripCircular

Create regular or AI-based probe-fed circular microstrip patch antenna

Description

Use the default patchMicrostripCircular object to create a probe-fed circular microstrip patch antenna resonating around 1 GHz. By default, the patch is centered at the origin with feed point along the radius and the ground plane 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.

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

Circular microstrip patch antenna

Creation

Syntax

circularpatch = patchMicrostripCircular

circularpatch = patchMicrostripCircular(Name=Value)

Description

circularpatch = patchMicrostripCircular creates a probe-fed circular microstrip patch antenna with default property values. The default dimensions are chosen for an operating frequency of around 1 GHz.

example

circularpatch = patchMicrostripCircular(Name=Value)sets 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, circularpatch = patchMicrostripCircular(Radius=0.2) creates a circular patch of radius 0.2 m.

example

You can also create a patchMicrostripCircular antenna resonating at a desired frequency using the design function.
You can also create a patchMicrostripCircular antenna from a microstrip patch type AIAntenna object using the exportAntenna function.
A patchMicrostripCircular type AIAntenna has some common tunable properties with a regular patchMicrostripCircular antenna for AI-based analysis. Other properties of the regular patchMicrostripCircular 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

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`Radius` — Patch radius
`0.0798` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

Patch radius, specified as a scalar in meters. The default radius is for an operating frequency of 1 GHz. This property is tunable for patchMicrostripCircular type AIAntenna object created using the design function.

Example: 0.2

Data Types: double

`Height` — Height of patch
`0.0060` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

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

Example: 0.001

Data Types: double

`GroundPlaneLength` — Ground plane length
0.3000 (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
0.3000 (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

`Substrate` — Type of dielectric material
`dielectric("Air")` (default) | `dielectric` object

Type of dielectric material used as a substrate, specified as a dielectric object. You can choose any dielectric material from the DielectricCatalog or specify a dielectric material of your choice. The substrate dimensions must be equal to the ground plane dimensions. For more information on dielectric substrate meshing, see Meshing.

Note

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

Example: Substrate=dielectric("FR4")

Example: antenna.Substrate = dielectric("FR4")

`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: [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

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.

Example: Load=lumpedElement(Impedance=75)

Example: antenna.Load = 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 plot axial ratio of antenna or array
`bandwidth`	Calculate and plot absolute bandwidth of antenna or array
`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`	Calculate and plot radiation efficiency of antenna or array
`EHfields`	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
`feedCurrent`	Calculate current at feed for antenna or array
`impedance`	Calculate and plot 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
`msiwrite`	Write antenna or array analysis data to MSI planet file
`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
`peakRadiation`	Calculate and mark maximum radiation points of antenna or array on radiation pattern
`rcs`	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
`resonantFrequency`	Calculate and plot resonant frequency of antenna
`returnLoss`	Calculate and plot return loss of antenna or scan return loss of array
`show`	Display antenna, array structures, shapes, or platform
`sparameters`	Calculate S-parameters for antenna or array
`stlwrite`	Write mesh information to STL file
`vswr`	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

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Circular Microstrip Patch

Open Live Script

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)

Figure contains an axes object. The axes object with title patchMicrostripCircular antenna element, xlabel x (mm), ylabel y (mm) contains 5 objects of type patch, surface. These objects represent PEC, feed.

Radiation Pattern and Impedance of Circular Microstrip Patch

Open Live Script

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 1GHz.

pattern(cp,1e9);

Figure contains 2 axes objects and other objects of type uicontrol. Axes object 1 contains 5 objects of type patch, surface. Hidden axes object 2 contains 17 objects of type surface, line, text, patch.

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);

Figure contains an axes object. The axes object with title Impedance, xlabel Frequency (GHz), ylabel Impedance (ohms) contains 2 objects of type line. These objects represent Resistance, Reactance.

Create AI Model Based Circular Microstrip Patch Antenna

This example uses:

Open Live Script

This example shows how to create an AI model based circular microstrip patch antenna at 1GHz and calculate its resonant frequency.

pAI = design(patchMicrostripCircular,1e9,ForAI=true)

pAI = 
  AIAntenna with properties:

   Antenna Info
               AntennaType: 'patchMicrostripCircular'
    InitialDesignFrequency: 1.0000e+09

   Tunable Parameters
                    Radius: 0.0814
                    Height: 0.0084

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

Vary its radius and height and calculate its resonant frequency.

pAI.Radius = 0.081;
pAI.Height = 0.0075;
resonantFrequency(pAI)

ans = 
1.0008e+09

Convert the AIAntenna to a regular circular microstrip patch antenna.

pmC = exportAntenna(pAI)

pmC = 
  patchMicrostripCircular with properties:

               Radius: 0.0810
               Height: 0.0075
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.3038
     GroundPlaneWidth: 0.3038
    PatchCenterOffset: [0 0]
           FeedOffset: [-0.0095 0.0365]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

Version History

Introduced in R2017b

expand all

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 patchMicrostripCircular type AIAntenna. To use this feature, you need license to the Statistics and Machine Learning Toolbox™ in addition to the Antenna Toolbox™.

patchMicrostripCircular

Description

Creation

Syntax

Description

Properties

`Radius` — Patch radius
`0.0798` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

`Height` — Height of patch
`0.0060` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

`GroundPlaneLength` — Ground plane length
0.3000 (default) | positive scalar

`GroundPlaneWidth` — Ground plane width
0.3000 (default) | positive scalar

`Substrate` — Type of dielectric material
`dielectric("Air")` (default) | `dielectric` object

`PatchCenterOffset` — Signed distance from center along length and width of ground plane
`[0 0]` (default) | two-element real vector

`FeedOffset` — Signed distance from center along length and width of ground plane
[–0.0525 0] (default) | two-element real vector

`Conductor` — Type of metal material
`"PEC"` (default) | `metal` object

`Load` — Lumped elements
`[1x1 lumpedElement]` (default) | `lumpedElement` object

`Tilt` — Tilt angle of antenna
`0` (default) | scalar | vector

`TiltAxis` — Tilt axis of antenna
`[1 0 0]` (default) | three-element vector | 2-by-3 matrix | `"X"` | `"Y"` | `"Z"`

Object Functions

Examples

Circular Microstrip Patch

Radiation Pattern and Impedance of Circular Microstrip Patch

Create AI Model Based Circular Microstrip Patch Antenna

Version History

R2023b: AI model based antenna analysis

See Also

Functions

Objects

Topics

patchMicrostripCircular

Description

Creation

Syntax

Description

Properties

Radius — Patch radius 0.0798 (default) | positive scalar | tunable for patchMicrostripCircular type AIAntenna

Height — Height of patch 0.0060 (default) | positive scalar | tunable for patchMicrostripCircular type AIAntenna

GroundPlaneLength — Ground plane length 0.3000 (default) | positive scalar

GroundPlaneWidth — Ground plane width 0.3000 (default) | positive scalar

Substrate — Type of dielectric material dielectric("Air") (default) | dielectric object

PatchCenterOffset — Signed distance from center along length and width of ground plane [0 0] (default) | two-element real vector

FeedOffset — Signed distance from center along length and width of ground plane [–0.0525 0] (default) | two-element real vector

Conductor — Type of metal material "PEC" (default) | metal object

Load — Lumped elements [1x1 lumpedElement] (default) | lumpedElement object

Tilt — Tilt angle of antenna 0 (default) | scalar | vector

TiltAxis — Tilt axis of antenna [1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

Object Functions

Examples

Circular Microstrip Patch

Radiation Pattern and Impedance of Circular Microstrip Patch

Create AI Model Based Circular Microstrip Patch Antenna

Version History

R2023b: AI model based antenna analysis

See Also

Functions

Objects

Topics

`Radius` — Patch radius
`0.0798` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

`Height` — Height of patch
`0.0060` (default) | positive scalar | tunable for `patchMicrostripCircular` type `AIAntenna`

`GroundPlaneLength` — Ground plane length
0.3000 (default) | positive scalar

`GroundPlaneWidth` — Ground plane width
0.3000 (default) | positive scalar

`Substrate` — Type of dielectric material
`dielectric("Air")` (default) | `dielectric` object

`PatchCenterOffset` — Signed distance from center along length and width of ground plane
`[0 0]` (default) | two-element real vector

`FeedOffset` — Signed distance from center along length and width of ground plane
[–0.0525 0] (default) | two-element real vector

`Conductor` — Type of metal material
`"PEC"` (default) | `metal` object

`Load` — Lumped elements
`[1x1 lumpedElement]` (default) | `lumpedElement` object

`Tilt` — Tilt angle of antenna
`0` (default) | scalar | vector

`TiltAxis` — Tilt axis of antenna
`[1 0 0]` (default) | three-element vector | 2-by-3 matrix | `"X"` | `"Y"` | `"Z"`