wireStack

Create single or multi-feed wire antenna

Since R2020a

Description

The wireStack object converts eligible dipole and loop antennas in the Antenna Catalog to wire antennas with single or multiple feeds. You can now create cylindrical thin-wire antennas and analyze them using the existing analysis functions.

Note

For some antennas, the wire geometry may be altered to allow the placement of the feed. Please use the show function to view the resulting antenna and verify its shape before running any analysis.

Creation

Syntax

ant = wireStack

ant = wireStack(element)

Description

ant = wireStack creates a half-wavelength wire dipole antenna. The default wire dipole is center fed with feed point at the origin, and is oriented along the z-axis. The antenna length is chosen for an operating frequency of 75 MHz.

ant = wireStack(element) converts a strip-based antenna from the Dipole Antennas, or Loop Antennas catalog to a wire antenna. Conversion is based on the equivalent radius using the strip2cylinder utility function.

Input Arguments

element — Dipole or loop antenna

antenna object

Antenna elements, specified as any one of the following antenna objects:

• Dipole Antennas: dipole, dipoleFolded, dipoleMeander, dipoleVee, dipoleHelix, dipoleJ, dipoleCycloid, dipoleCrossed

• Loop Antennas: loopCircular, loopRectangular

Output Arguments

ant — Wire antenna

wireStack object (default)

Wire antenna, returned as a wireStack object.

Properties

Note

The wireStack antenna object only accepts dot method to change its properties.

Name — Name of wire antenna

"Dipole" (default) | string

Name of the wire antenna, specified as a string.

Example: "monopole"

Data Types: string

FeedLocation — Antenna feed locations

[0 0 0] (default) | N-by-3 array of Cartesian coordinates

This property is read-only.

Antenna feed locations, returned as an N-by-3 array of Cartesian coordinates in meters.

Example: [0 2 4]

Data Types: double

FeedVoltage — Magnitude of excitation voltage at each feed

1 (default) | 1-by-N array of doubles

Magnitude of excitation voltage in Volts at each feed, specified as a 1-by-N array of doubles.

Example: 2

Data Types: double

FeedPhase — Phase shift applied to voltage at each feed

0 (default) | 1-by-M array of doubles

Phase shift applied to voltage at each feed in degrees, specified as a 1-by-M array of doubles.

Example: 60

Data Types: double

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
beamwidth	Beamwidth of antenna
charge	Charge distribution on antenna or array surface
current	Current distribution on antenna or array surface
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
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
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
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

Default Wire Antenna

Create and view a default dipole wire antenna.

ant = wireStack

ant = 
  wireStack with properties:

            Name: 'Dipole'
    FeedLocation: [0 0 0]
     FeedVoltage: 1
       FeedPhase: 0
            Tilt: 0
        TiltAxis: [1 0 0]

show(ant)

Plot the radiation pattern of the antenna at the specified frequency.

pattern(ant,75e6)

Circular Loop Wire Antenna

Create and view a circular loop wire antenna.

ant = loopCircular(Radius=0.075, Thickness=0.0005);
wireant = wireStack(ant)

wireant = 
  wireStack with properties:

            Name: 'Circular loop'
    FeedLocation: [3.1745e-16 0.0747 0]
     FeedVoltage: 1
       FeedPhase: 0
            Tilt: 0
        TiltAxis: [1 0 0]

show(wireant)

Plot the directivity pattern of the antenna at 1 GHz.

pattern(wireant,1e9);

Version History

Introduced in R2020a