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customArrayGeometry

Create array represented by 2-D custom geometry

Description

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

Creation

Syntax

cg = customArrayGeometry
ca = customArrayGeometry(Name,Value)

Description

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

example

ca = customArrayGeometry(Name,Value) creates a 2-D array geometry, with additional properties specified by one or more name-value pair arguments. Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1, Value1, ..., NameN, ValueN. Properties not specified retain their default values.

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: 'Operation','P1-P2'

Data Types: double

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: 'FeedLocation', [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 non-negative scalar or vector of non-negative scalars. Set property value to 0 to model dead elements.

Example: 'AmplitudeTaper',3

Data Types: double

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

Example: 'PhaseShift',[3 3 0 0] specified the phase shift for custom array containing four elements.

Data Types: double

Tilt angle of array, specified as a scalar or vector with each element unit in degrees.

Example: 'Tilt',90

Example: 'Tilt',[90 90 0]

Data Types: double

Tilt axis of the array, specified as:

  • A three-element vector 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 as three-element vectors of Cartesian coordinates. In this case, the antenna rotates along the line joining the two points.

  • A string input for simple rotations around the principal planes, X, Y, or Z.

For more information see, Rotate Antenna and Arrays

Example: 'TiltAxis',[0 1 0]

Example: 'TiltAxis',[0 0 0;0 1 0]

Example: 'TiltAxis','Z'

Data Types: double

Object Functions

showDisplay antenna or array structure; Display shape as filled patch
infoDisplay information about antenna or array
axialRatioAxial ratio of antenna
beamwidthBeamwidth of antenna
chargeCharge distribution on metal or dielectric antenna or array surface
currentCurrent distribution on metal or dielectric antenna or array surface
designDesign prototype antenna for resonance at specified frequency
EHfieldsElectric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
impedanceInput impedance of antenna; scan impedance of array
meshMesh properties of metal or dielectric antenna or array structure
meshconfigChange mesh mode of antenna structure
patternRadiation pattern of antenna or array; Embedded pattern of antenna element in array
patternAzimuthAzimuth pattern of antenna or array
patternElevationElevation pattern of antenna or array
returnLossReturn loss of antenna; scan return loss of array
sparametersS-parameter object
showDisplay antenna or array structure; Display shape as filled patch
vswrVoltage standing wave ratio of antenna

Examples

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Create a custom array using customArrayGeometry.Visualize it and plot the impedance. Also, visualize the current distribution on 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]   = em.internal.makeplate(Lp,Wp,2,'linear');

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

Ls  = 0.05;
Ws  = 0.4;
offset = 0.12;
[~,p2]   = em.internal.makeplate(Ls,Ws,2,'linear');
p3 = em.internal.translateshape(p2, [offset, 0, 0]);
p2 = em.internal.translateshape(p2, [-offset, 0, 0]);

Create a feed in between the slots on the ground plane.

Wf  = 0.01;
[~,p4]   = em.internal.makeplate(Ls,Wf,2,'linear');
p5 = em.internal.translateshape(p4, [offset, 0, 0]);
p4 = em.internal.translateshape(p4, [-offset, 0, 0]);

Create an array using the slotted ground plane.

carray = customArrayGeometry;
carray.Boundary = {p1', p2', p3', p4', p5'};
carray.Operation= 'P1-P2-P3+P4+P5';
carray.NumFeeds = 2;
carray.FeedWidth= [0.01 0.01];
carray.FeedLocation = [-offset,0,0 ; offset,0,0];

Visulaize 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);

Visulaize the current distribution on the array at 410 MHz.

figure; current(carray, 410e6);

References

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

Introduced in R2017a

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