slot

Create rectangular slot antenna on ground plane

Description

The slot object is a rectangular slot antenna on a ground plane. The default slot has its first resonance at 130 MHz.

Creation

Description

s = slot creates a rectangular slot antenna on a ground plane.

example

s = slot(Name,Value) creates a rectangular slot 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 retain default values.

Properties

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Slot length, specified as a scalar in meters.

Example: 'Length',2

Data Types: double

Slot width, specified a scalar in meters.

Example: 'Width',0.02

Data Types: double

Slot antenna center, specified as a three-element vector in Cartesian coordinates.

Example: 'SlotCenter',[8 0 0]

Data Types: double

Ground plane length, specified as a scalar in meters. By default, the length is measured along the x-axis.

Example: 'GroundPlaneLength',3

Data Types: double

Ground plane width, specified as a scalar in meters. By default, the width is measured along the y-axis.

Example: 'GroundPlaneWidth',4

Data Types: double

Distance from center along x-axis, specified as a scalar in meters. Offset from slot center is measured along the length.

Example: 'FeedOffset',3

Data Types: double

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

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

Example: s.Load = lumpedElement('Impedance',75)

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

Data Types: double

Tilt axis of the antenna, 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 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'.

For more information, see Rotate Antennas and Arrays.

Example: 'TiltAxis',[0 1 0]

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

Example: ant.TiltAxis = 'Z'

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 or arrays 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 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
vswrVoltage standing wave ratio of antenna

Examples

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Create and view a slot antenna that has 1m length and 100mm width.

s = slot('Length',1,'Width',0.1);
show(s)

Calculate and plot the impedance of a slot antenna over a frequency range of 100-150 MHz.

s = slot('Length',1,'Width',0.1);
impedance(s,linspace(100e6,150e6,51));

References

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

Introduced in R2015a