invertedFcoplanar

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

Description

The invertedFcoplanar object is a coplanar inverted-F antenna with a rectangular ground plane. By default, the dimensions are chosen for an operating frequency of 1.7 GHz. Coplanar inverted-F antennas are used in RFID tags and Internet of Things (IoT) applications. This antenna is an altered version of the inverted-F antenna, providing a low-profile antenna with more design parameters and a wider bandwidth.

Creation

Syntax

fco = invertedFcoplanar

fco = invertedFcoplanar(Name,Value)

Description

fco = invertedFcoplanar creates a coplanar inverted-F antenna with the rectangular ground plane. By default, the antenna dimensions are for an operating frequency of 1.7 GHz.

fco = invertedFcoplanar(Name,Value) creates a coplanar inverted-F 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

0.0040 (default) | scalar

Width of radiating arm, specified as the comma-separated pair consisting of 'RadiatorArmWidth'and a scalar in meters.

Example: 'RadiatorArmWidth',0.05

Data Types: double

FeederArmWidth — Width of feeding arm

1.0000e-03 (default) | scalar

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

Example: 'FeederArmWidth',0.05

Data Types: double

ShortingArmWidth — Width of shorting arm

0.0040 (default) | scalar

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

Example: 'ShortingArmWidth',1

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

LengthToOpenEnd — Length of stub from feed to open end

0.0350 (default) | scalar

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

Example: 'LengthToOpenEnd',0.050

Data Types: double

LengthToShortEnd — Length of stub from feed to shorting end

0.0100 (default) | scalar

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

Example: 'LengthToShortEnd',0.035

Data Types: double

GroundPlaneLength — Length of ground plane

0.0800 (default) | scalar

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 as a scalar in meters.

Example: 'FeedOffset',0.06

Data Types: double

Load — Lumped elements

[1x1 lumpedElement] (default) | lumped element object handle

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: fco.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 degree about two axes, defined by vectors.

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 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

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 at specified frequency
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
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
returnLoss	Return loss of antenna; scan return loss of array
sparameters	S-parameter object
show	Display antenna or array structure; Display shape as filled patch
vswr	Voltage standing wave ratio of antenna

Examples

Coplanar Inverted-F Antenna

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

fco = invertedFcoplanar

fco = 
  invertedFcoplanar with properties:

     RadiatorArmWidth: 0.0040
       FeederArmWidth: 1.0000e-03
     ShortingArmWidth: 0.0040
      LengthToOpenEnd: 0.0350
     LengthToShortEnd: 0.0100
               Height: 0.0100
    GroundPlaneLength: 0.0800
     GroundPlaneWidth: 0.0700
           FeedOffset: 0
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

show(fco)

Radiation Pattern of Coplanar Inverted-F Antenna

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

 fco = invertedFcoplanar('Height',14e-3,'GroundPlaneLength', 100e-3,  ...
                  'GroundPlaneWidth', 100e-3);

Plot the radiation pattern of the above antenna.

 pattern(fco,1.30e9)

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.