invertedLcoplanar

Create inverted-L antenna in same plane as rectangular ground plane

Description

The invertedLcoplanar object is a coplanar inverted-L antenna with the rectangular ground plane. By default, the dimensions are chosen for an operating frequency of 1.6 GHz. This antenna is used in applications that require low-profile narrow-bandwidth antennas, such as the transmitter for a garage door opener and Internet of Things (IoT) applications.

Creation

Syntax

lco = invertedLcoplanar

lco = invertedLcoplanar(Name,Value)

Description

lco = invertedLcoplanar creates a coplanar inverted-L antenna with the rectangular ground plane. By default, the antenna dimensions are for an operating frequency of 1.6 GHz.

lco = invertedLcoplanar(Name,Value) creates a coplanar inverted-L 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 their default values.

Properties

RadiatorArmWidth — Width of radiating arm

0.0020 (default) | scalar

Width of radiating arm, specified as a scalar in meters.

Example: 'RadiatorArmWidth',0.05

Data Types: double

FeederArmWidth — Width of feeding arm

0.0020 (default) | scalar

Width of feeding arm, specified as scalar in meters.

Example: 'FeederArmWidth',0.05

Data Types: double

Height — Height of antenna

0.0100 (default) | scalar

Height of antenna from ground plane, specified as a scalar in meters.

Example: 'Height',0.0800

Data Types: double

Length — Length of stub from feed to open end

0.0350 (default) | scalar

Length of the stub from the feed to the open-end, specified as a scalar in meters.

Example: 'Length',0.0800

Data Types: double

GroundPlaneLength — Length of ground plane

0.0800 (default) | scalar in meters

Length of the ground plane, specified as a scalar in meters.

Example: 'GroundPlaneLength',0.035

Data Types: double

GroundPlaneWidth — Width of ground plane

0.0700 (default) | scalar

Width of the ground plane, specified as a scalar in meters.

Example: 'GroundPlaneWidth',0.035

Data Types: double

FeedOffset — Signed distance from center of ground plane

0 (default) | scalar

Signed distance from center of groundplane, specified a scalar in meters.

Example: 'FeedOffset',0.06

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: lco.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
show	Display antenna, array structures or shapes
vswr	Voltage standing wave ratio of antenna

Examples

Coplanar Inverted-L Antenna

Create a default coplanar inverted-L antenna and view it.

lco =  invertedLcoplanar

lco = 
  invertedLcoplanar with properties:

     RadiatorArmWidth: 0.0020
       FeederArmWidth: 0.0020
               Length: 0.0350
               Height: 0.0100
    GroundPlaneLength: 0.0800
     GroundPlaneWidth: 0.0700
           FeedOffset: 0
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

show(lco)

Impedance of Coplanar Inverted-L Antenna

Create a coplanar inverted-L antenna of length 0.050 m, height 0.014 m, ground plane length 0.1 m, and ground plane width 0.1 m.

lco = invertedLcoplanar('Length',50e-3, 'Height',14e-3,...
    'GroundPlaneLength',100e-3,'GroundPlaneWidth',100e-3)

lco = 
  invertedLcoplanar with properties:

     RadiatorArmWidth: 0.0020
       FeederArmWidth: 0.0020
               Length: 0.0500
               Height: 0.0140
    GroundPlaneLength: 0.1000
     GroundPlaneWidth: 0.1000
           FeedOffset: 0
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

Plot the impedance over 1.1 GHz to 1.5 GHz in steps of 10 MHz.

impedance(lco,1.1e9:10e6:1.5e9);

References

[1] Balanis, C. A. Antenna Theory. Analysis and Design. 3rd Ed. Hoboken, NJ: John Wiley & Sons, 2005.

[2] Stutzman, W. L. and Gary A. Thiele. Antenna Theory and Design. 3rd Ed. River Street, NJ: John Wiley & Sons, 2013.

Version History

Introduced in R2016b