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customArrayGeometry

Create array represented by 2-D custom geometry

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Description

The customArrayGeometry object is an array represented by a 2-D custom geometry on the xy-plane. You can use the customArrayGeometry to import a 2-D custom geometry, define feeds to create an array element, and analyze the custom array.

Creation

Syntax

array = customArrayGeometry
array = customArrayGeometry(Name=Value)

Description

array = customArrayGeometry creates a custom array represented by 2-D geometry on the X-Y plane, based on the specified boundary.

array = customArrayGeometry(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, ca = customArrayGeometry(PhaseShift=10) applies a phase shift of 10 degrees to the elements in the custom geometry.

example

Output Arguments

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Custom array geometry, returned as an customArrayGeometry object.

Properties

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Boundary information in Cartesian coordinates, specified as a cell array in meters.

Data Types: double

Boolean operation performed on the boundary list, specified as a character vector. operation set is; [+, -, *].

Example: 'P1-P2'

Data Types: char

Array element feed location in Cartesian coordinates, specified as a three-element vector. The three elements represent the X, Y, and Z coordinates respectively.

Example: [0 0.2 0]

Data Types: double

Width of feed for array elements, specified as a scalar in meters.

Example: 0.05

Data Types: double

Excitation amplitude for array elements, specified as a positive scalar or vector. Set property value to 0 to model dead elements.

Example: 3

Data Types: double

Phase shift for array elements, specified as a real scalar or a real vector in degrees.

Example: [3 3 0 0] specifies the phase shift for custom array containing four elements.

Data Types: double

Tilt angle of the array 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 array at 90 degrees about the two axes, defined by the vectors.

Data Types: double

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

  • Three-element vectors 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-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 array 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

axialRatioCalculate and plot axial ratio of antenna or array
beamwidthBeamwidth of antenna
chargeCharge distribution on antenna or array surface
correlationCorrelation coefficient between two antennas in array
currentCurrent distribution on antenna or array surface
efficiencyCalculate and plot radiation efficiency of antenna or array
EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrentCalculate current at feed for antenna or array
impedanceCalculate and plot input impedance of antenna or scan impedance of array
infoDisplay information about antenna, array, or platform
layoutDisplay array or PCB stack layout
meshMesh properties of metal, dielectric antenna, or array structure
meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwriteWrite antenna or array analysis data to MSI planet file
patternPlot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuthAzimuth plane radiation pattern of antenna or array
patternElevationElevation plane radiation pattern of antenna or array
peakRadiationCalculate and mark maximum radiation points of antenna or array on radiation pattern
rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
returnLossCalculate and plot return loss of antenna or scan return loss of array
showDisplay antenna, array structures, shapes, or platform
sparametersCalculate S-parameters for antenna or array
stlwriteWrite mesh information to STL file
vswrCalculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

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Open Live Script

Create and visualize a custom array using customArrayGeometry. Plot the impedance and current distribution of the array.

Create a ground plane with a length of 0.6 m and a width of 0.5 m.

Lp  = 0.6;
Wp  = 0.5;
p1  = antenna.Rectangle(Length=Lp, Width=Wp);

Create slots of length 0.05 m and width 0.4 m on the ground plane.

Add strips of length 0.05 m and width 0.01 m in between the slots for housing the feed point.

Ls  = 0.05;
Ws  = 0.4;
offset = 0.12;
p2 = antenna.Rectangle(Length=Ls, Width=Ws, Center=[-offset 0]);
p3 = antenna.Rectangle(Length=Ls, Width=Ws, Center=[offset 0]);
Wf  = 0.01;
p4   = antenna.Rectangle(Length=Ls, Width=Wf, Center=[-offset 0]);
p5   = antenna.Rectangle(Length=Ls, Width=Wf, Center=[offset 0]);

Create custom array using the slotted ground plane. Create a feed in between the slots on the ground plane.

b1 = getShapeVertices(p1);
b2 = getShapeVertices(p2);
b3 = getShapeVertices(p3);
b4 = getShapeVertices(p4);
b5 = getShapeVertices(p5);
carray = customArrayGeometry;
carray.Boundary = {b1,b2,b3,b4,b5}';
carray.Operation = 'P1-P2-P3+P4+P5';
carray.NumFeeds = 2;
carray.FeedLocation = [-offset 0 0; offset 0 0];
carray.FeedWidth = [Wf Wf];

Visualize the array.

figure
show(carray)

Figure contains an axes object. The axes object with title customArrayGeometry array element, xlabel x (mm), ylabel y (mm) contains 4 objects of type patch, surface. These objects represent PEC, feed.

Calculate the impedance of the array using the frequency range of 350 MHz to 450 MHz.

figure
impedance(carray, 350e6:5e6:450e6)

Figure contains an axes object and other objects of type uicontrol. The axes object with title Active Impedance, xlabel Frequency (MHz), ylabel Impedance (ohms) contains 2 objects of type line. These objects represent Resistance Element 1, Reactance Element 1.

Visualize the current distribution of the array at 410 MHz.

figure
current(carray, 410e6, Scale="log10")

Figure contains an axes object. The axes object with title Current distribution (log10), xlabel x (m), ylabel y (m) contains 3 objects of type patch.

References

[1] Balanis, C. A. Antenna Theory. Analysis and Design. 3rd Ed. Hoboken, NJ: John Wiley & Sons, 2005.

Version History

Introduced in R2017a

See Also

Objects

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