draCylindrical

Create cylindrical dielectric resonator antenna

Since R2021a

Description

The default draCylindrical object creates a cylindrical dielectric resonator antenna resonating around 4.9 GHz. The cylindrical dielectric resonator antenna consists of a cylindrical dielectric placed on the ground plane. It has high power-handling capacity and can provide high gain and bandwidth. These antennas are more suitable for use at microwave frequencies. Cylindrical dielectric resonator antennas are widely used in medium- and long-range communications.

Creation

Syntax

dc = draCylindrical

dc = draCylindrical(Name=Value)

Description

dc = draCylindrical creates a cylindrical dielectric resonator antenna with default property values. The default dimensions are chosen for an operating frequency of around 4.9 GHz. The default antenna is probe fed with the feed point at the origin.

dc = draCylindrical(Name=Value) sets properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1,...,NameN=ValueN. Properties that you do not specify, retain their default values.

For example, dc = draCylindrical(ResonatorRadius=0.04) creates a cylindrical dielectric resonator antenna with radius of the dielectric resonator set to 40 mm. and default values for other properties.

Properties

ResonatorRadius — Radius of dielectric resonator

0.02 (default) | positive scalar

Radius of the dielectric resonator, specified as a positive scalar in meters.

Example: 0.05

Data Types: double

Substrate — Type of dielectric material

dielectric(EpsilonR=6,LossTangent=0.002) (default) | dielectric object

Type of dielectric material used as a substrate, specified as a dielectric object. The default dielectric material has a relative permittivity of 6 and a loss tangent of 0.002. You can choose any material from the DielectricCatalog or use your own dielectric material. For more information on dielectric substrate meshing, see Meshing.

Note

The substrate dimensions must be less than the ground plane dimensions.

Example: dielectric("FR4")

GroundPlaneLength — Ground plane length along x-axis

0.14 (default) | positive scalar

Ground plane length, specified as a positive scalar in meters. By default, ground plane length is measured along the x-axis. Set GroundPlaneLength to Inf to use the infinite ground plane technique for antenna analysis.

Example: 120e-3

Data Types: double

GroundPlaneWidth — Ground plane width along y-axis

0.08 (default) | positive scalar

Ground plane width, specified as a positive scalar in meters. By default, ground plane width is measured along the y-axis. Set GroundPlaneWidth to Inf to use the infinite ground plane technique for antenna analysis.

Example: 118e-3

Data Types: double

FeedWidth — Width of feed

0.001 (default) | positive scalar

Width of the feed, specified as a positive scalar in meters.

Example: 5e-05

Data Types: double

FeedHeight — Height of feed

0.05 (default) | positive scalar

Height of the feed, specified as a positive scalar in meters.

Example: 0.060

Data Types: double

FeedOffset — Signed distance between feed point and center of ground plane

[0 0] (default) | two-element vector

Signed distance between feed point and the center of the ground plane, specified as a two-element vector in meters. The two elements represent the distances in x, and y directions from center of the ground plane respectively.

Example: [–0.0070 0.01]

Data Types: double

Conductor — Type of metal material

metal("PEC") (default) | metal object

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

Example: metal("Copper")

Tilt — Tilt angle of antenna

0 (default) | scalar | vector

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

Example: 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.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

Tilt axis of the antenna, specified as one of these values:

• 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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points.

• "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Load — Lumped elements

[1x1 lumpedElement] (default) | lumpedElement object

Lumped elements added to the antenna feed, specified as a lumpedElement object. You can add a load anywhere on the surface of the antenna. By default, the load is at the feed.

Example: Load=lumpedElement(Impedance=75)

Example: antenna.Load = lumpedElement(Impedance=75)

Object Functions

axialRatio	Calculate and plot axial ratio of antenna or array
bandwidth	Calculate and plot absolute bandwidth of antenna or array
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 or create AI-based antenna from antenna catalog objects
efficiency	Calculate and plot radiation efficiency of antenna or array
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrent	Calculate current at feed for antenna or array
impedance	Calculate and plot input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwrite	Write antenna or array analysis data to MSI planet file
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
peakRadiation	Calculate and mark maximum radiation points of antenna or array on radiation pattern
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and plot resonant frequency of antenna
returnLoss	Calculate and plot return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antenna or array
stlwrite	Write mesh information to STL file
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

Create Default Cylindrical Dielectric Resonator Antenna and Plot Radiation Pattern

Create a cylindrical dielectric resonator antenna with default properties.

ant = draCylindrical

ant = 
  draCylindrical with properties:

      ResonatorRadius: 0.0200
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.1400
     GroundPlaneWidth: 0.0800
            FeedWidth: 1.0000e-03
           FeedHeight: 0.0500
           FeedOffset: [0 0]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

View the antenna using the show function.

show(ant)

Plot the radiation pattern of the cylindrical dielectric resonator antenna at a frequency of 4 GHz.

pattern(ant,4e9)

Create Cylindrical Dielectric Resonator with Multiple Dielectric Substrates

Create a cylindrical dielectric resonator antenna with FR4, Teflon, and foam as substrates.

ant = draCylindrical;
d = dielectric("FR4","Teflon","Foam");
d.Thickness = [ant.Substrate.Thickness/3 ant.Substrate.Thickness/3 ant.Substrate.Thickness/3];
ant.Substrate = d;  
ant = draCylindrical(Substrate=d);
show(ant)

Create a cylindrical dielectric resonator antenna with substrates having relative permittivity as 2.3 and 4.5, respectively. The value of loss tangent for both the substrates is 0.002.

ant = draCylindrical;
d = dielectric;                                                                                                                                                                                                                               
d.Name = {'sub1','sub2'};
d.EpsilonR = [2.3 4.5];
d.LossTangent = [0.002 0.002];
d.Thickness = [ant.Substrate.Thickness/2 ant.Substrate.Thickness/2];
ant.Substrate = d;
show(ant)

More About

Parametric Analysis Guidelines

To understand how the properties of the draCylindrical antenna object influence the antenna design, use these parametric analysis guidelines.

• To increase the operating frequency, decrease the dimensions of the resonator of the draCylindrical antenna using the ResonatorRadius property.

• To increase the gain, select proper feed location using the FeedOffset property and increase the height of the draCylindrical antenna object using the FeedHeight property.

References

[1] Keyrouz, S., and D. Caratelli. “Dielectric Resonator Antennas: Basic Concepts, Design Guidelines, and Recent Developments at Millimeter-Wave Frequencies.” International Journal of Antennas and Propagation 2016 (2016): 1–20.

Version History

Introduced in R2021a