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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.

example

array = customArrayGeometry(Name=Value) creates a 2-D array geometry, with additional Properties specified by 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 not specified retain their default values.

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: 'FeedWidth',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/or 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
efficiencyRadiation efficiency of antenna
EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
impedanceInput 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
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
rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
returnLossReturn loss of antenna or scan return loss of array
sparametersCalculate S-parameters for antennas and antenna arrays
showDisplay antenna, array structures, shapes, or platform
vswrVoltage 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)

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

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

Visualize the current distribution of the array at 410 MHz.

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

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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