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

Syntax

s = slot

s = slot(Name,Value)

Description

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

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

Length — Slot length

1 (default) | scalar

Slot length, specified as a scalar in meters.

Example: 'Length',2

Data Types: double

Width — Slot width

0.1000 (default) | scalar

Slot width, specified a scalar in meters.

Example: 'Width',0.02

Data Types: double

SlotCenter — Slot antenna center

[0 0 0] (default) | three-element vector in Cartesian coordinates

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

Example: 'SlotCenter',[8 0 0]

Data Types: double

GroundPlaneLength — Ground plane length

1.5000 (default) | scalar

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

GroundPlaneWidth — Ground plane width

1.5000 (default) | scalar

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

FeedOffset — Distance from center along x-axis

0 (default) | scalar

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

Conductor — Type of metal material

'PEC' (default) | metal object

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

Load — Lumped elements

[1x1 LumpedElement] (default) | lumped element object

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.

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

Tilt — Tilt angle of antenna

0 (default) | scalar | vector

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 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

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates | 'X' | 'Y' | 'Z'

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'.

For more information, see Rotate Antennas and Arrays.

Example: TiltAxis=[0 1 0]

Example: TiltAxis=[0 0 0;0 1 0]

Example: TiltAxis = 'Z'

Data Types: double

Object Functions

show	Display antenna, array structures or shapes
info	Display information about antenna or array
axialRatio	Axial ratio of antenna
beamwidth	Beamwidth of antenna
charge	Charge distribution on antenna or array surface
current	Current distribution on 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, 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

Create and View Slot Antenna

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

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

Impedance of Slot Antenna

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.

Version History

Introduced in R2015a