linearArray

Create linear antenna array

Description

The linearArray class creates a linear antenna array in the X-Y plane. By default, the linear array is a two-element dipole array. The dipoles are center fed. Each dipole resonates at 70 MHz when isolated.

Creation

Description

example

array = linearArray creates a linear antenna array in the X-Y plane.

example

array = linearArray(Name,Value) class to create a linear antenna array, 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.

Output Arguments

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Linear array, returned as an linearArray object.

Properties

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Individual antenna elements or linear arrays, specified as an antenna or array object.

Example: 'Element',monopole

Number of antenna elements in array, specified as a scalar.

Example: 'NumElements',4

Spacing between antenna elements, specified as a scalar or vector in meters. By default, the dipole elements are spaced 2 m apart.

Example: 'ElementSpacing',3

Data Types: double

Excitation amplitude of antenna elements, specified as a scalar or vector. Set the property value to 0 to model dead elements. This value corresponds to the excitation voltages for the elements in the array.

Example: 'AmplitudeTaper',3

Data Types: double

Phase shift for antenna elements, specified as a scalar or vector in degrees. This value corresponds to the excitation voltages for the elements in the array.

Example: 'PhaseShift',[3 3 0 0]

Data Types: double

Tilt angle of the array specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.

Example: 'Tilt',90,

Example: 'Tilt',[90 90],'TiltAxis',[0 1 0;0 1 1] tilts the array at 90 degree about two axes, defined by vectors.

Data Types: double

Tilt axis of the array, specified as:

  • 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, each specified as three-element vectors of Cartesian coordinates. In this case, the array rotates around the line joining the two points in space.

  • A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'.

For more information, see Rotate Antennas and Arrays.

Example: 'TiltAxis',[0 1 0]

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

Example: array.TiltAxis = 'Z'

Object Functions

showDisplay antenna or array structure; Display shape as filled patch
infoDisplay information about antenna or array
beamwidthBeamwidth of antenna
chargeCharge distribution on metal or dielectric antenna or array surface
correlationCorrelation coefficient between two antennas in array
currentCurrent distribution on metal or dielectric antenna or array surface
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
patternRadiation pattern and phase 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

Examples

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Create a linear array of four dipoles and plot the layout of the array.

la = linearArray;
la.NumElements = 4;
layout(la);

Plot the radiation pattern of a four element linear array of dipoles at a frequency 70MHz.

la = linearArray('NumElements',4);
pattern(la,70e6);

Create a linear array of two monopoles.

m1 = monopole;
m2 = monopole('Height',0.5);
mla = linearArray
mla = 
  linearArray with properties:

           Element: [1x1 dipole]
       NumElements: 2
    ElementSpacing: 2
    AmplitudeTaper: 1
        PhaseShift: 0
              Tilt: 0
          TiltAxis: [1 0 0]

mla.Element = [m1,m2];
show(mla);

Create an array of discones with element spacing of 3 m.

la = linearArray('Element',discone);
la.ElementSpacing = 3;
show(la)

Create a rectangular of the linear array.

ra = rectangularArray("Element",la)
ra = 
  rectangularArray with properties:

           Element: [1x1 linearArray]
              Size: [2 2]
        RowSpacing: 2
     ColumnSpacing: 2
           Lattice: 'Rectangular'
    AmplitudeTaper: 1
        PhaseShift: 0
              Tilt: 0
          TiltAxis: [1 0 0]

show(ra)

Create a linear array and plot the pattern.

la=linearArray('Element',linearArray('ElementSpacing',1)); 
show(la)

pattern(la,70e6); 

References

[1] Balanis, C.A. Antenna Theory. Analysis and Design, 3rd Ed. New York: Wiley, 2005.

Introduced in R2015a