loopRectangular

Create rectangular loop antenna

Description

The loopRectangular object is a rectangular loop antenna on the xy- plane.

The thickness of the loop is related to the diameter of an equivalent cylinder loop by the equation

$t=2d=4r$

, where:

• d is the diameter of equivalent cylindrical loop

• r is the radius of equivalent cylindrical loop

For a given cylinder radius, use the cylinder2strip utility function to calculate the equivalent width. The default circular loop antenna is fed at the positive y-axis. The point of the y-axis is the midpoint of the inner and outer perimeter of the loop. Creation

Description

lr = loopRectangular creates a rectangular loop antenna in the X-Y plane. By default, the dimensions are chosen for the operating frequency 53 MHz.

example

lr = loopRectangular(Name,Value) creates a rectangular loop antenna, 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 retains their default values.

Properties

expand all

Loop length along x-axis, specified as a scalar in meters.

Example: 'Length',3

Data Types: double

Loop width along y-axis, specified as a scalar in meters.

Example: 'Width',2

Data Types: double

Loop thickness, specified as a scalar in meters.

Example: 'Thickness',2

Data Types: double

Type of the metal used as a conductor, specified as a metal material object. You can choose any metal from the MetalCatalog or specify a metal of your choice. For more information, see metal. For more information on metal conductor meshing, see Meshing.

Example: m = metal('Copper'); 'Conductor',m

Example: m = metal('Copper'); ant.Conductor = m

Lumped elements added to the antenna feed, specified as a lumped element object. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object for the load created using lumpedElement.

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

Example: 'Tilt',90

Example: ant.Tilt = 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.

Note

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

Data Types: double

Tilt axis of the antenna, specified as:

• 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, each specified as three-element vectors of Cartesian coordinates. In this case, the antenna 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'.

Example: 'TiltAxis',[0 1 0]

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

Example: ant.TiltAxis = 'Z'

Note

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

Data Types: double

Object Functions

 show Display antenna or array structure; display shape as filled patch info Display information about antenna or array axialRatio Axial ratio of antenna beamwidth Beamwidth of antenna charge Charge distribution on metal or dielectric antenna or array surface current Current distribution on metal or dielectric antenna or array surface design Design prototype antenna or arrays for resonance around specified frequency efficiency Radiation efficiency of antenna EHfields Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays impedance Input impedance of antenna; scan impedance of array mesh Mesh properties of metal or dielectric antenna or array structure meshconfig Change mesh mode of antenna structure optimize Optimize antenna or array using SADEA optimizer pattern Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array patternAzimuth Azimuth pattern of antenna or array patternElevation Elevation pattern of antenna or array rcs Calculate and plot radar cross section (RCS) of platform, antenna, or array returnLoss Return loss of antenna; scan return loss of array sparameters Calculate S-parameter for antenna and antenna array objects vswr Voltage standing wave ratio of antenna

Examples

collapse all

Create and view a rectangular loop antenna with 0.64m length, 0.64m width.

r = loopRectangular('Length',0.64,'Width',0.64)
r =
loopRectangular with properties:

Length: 0.6400
Width: 0.6400
Thickness: 0.0100
Conductor: [1x1 metal]
Tilt: 0
TiltAxis: [1 0 0]

show(r) Calculate the impedance of a rectangular loop antenna over a frequency range of 120MHz-140MHz.

r = loopRectangular('Length',0.64,'Width',0.64)
r =
loopRectangular with properties:

Length: 0.6400
Width: 0.6400
Thickness: 0.0100
Conductor: [1x1 metal]
Tilt: 0
TiltAxis: [1 0 0] 