dielectric
Dielectric material for use as substrate
Description
Examples
PIFA Antenna with Dielectric Substrate
Use a Teflon dielectric material as a substrate for a PIFA antenna. View the antenna.
d = dielectric("Teflon")
d = dielectric with properties: Name: 'Teflon' EpsilonR: 2.1000 LossTangent: 2.0000e-04 Thickness: 0.0060 For more materials see catalog
p = pifa(Height=0.0060,Substrate=d)
p = pifa with properties: Length: 0.0300 Width: 0.0200 Height: 0.0060 Substrate: [1x1 dielectric] GroundPlaneLength: 0.0360 GroundPlaneWidth: 0.0360 PatchCenterOffset: [0 0] ShortPinWidth: 0.0200 FeedOffset: [-0.0020 0] Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
show(p)
Custom Dielectric Properties
Create a patch microstrip antenna using a substrate with a relative permittivity of 2.70, a loss tangent of 0.002 and a thickness of 0.0008 m. View the antenna.
t = dielectric(Name="Taconic_TLC",EpsilonR=2.70,LossTangent=0.002,... Thickness=0.0008); p = patchMicrostrip(Height=0.0008,Substrate=t)
p = patchMicrostrip with properties: Length: 0.0750 Width: 0.0375 Height: 8.0000e-04 Substrate: [1x1 dielectric] GroundPlaneLength: 0.1500 GroundPlaneWidth: 0.0750 PatchCenterOffset: [0 0] FeedOffset: [-0.0187 0] Conductor: [1x1 metal] Tilt: 0 TiltAxis: [1 0 0] Load: [1x1 lumpedElement]
show(p)
Patch Antenna with Air Gap between Groundplane and Dielectric
Create a microstrip patch antenna.
p = patchMicrostrip;
For property values of air and teflon dielectrics, refer Dielectric Catalog.
openDielectricCatalog
Use Teflon as a dielectric substrate. There is an air gap between the patch groundplane and the dielectric.
sub = dielectric(Name=["Air" "Teflon"],EpsilonR=[1 2.1],... Thickness=[0.002 0.004],LossTangent=[0 2e-04]);
Add the substrate to the patch antenna.
p.Substrate = sub; figure show(p)
Three Layer Dielectric Substrate between Patch and Ground Plane
Create a microstrip patch antenna.
p = patchMicrostrip;
For dielectric properties, use the Dielectric Catalog.
openDielectricCatalog
Use FR4, Teflon and Foam as the three layers of the substrate.
sub = dielectric(Name=["FR4" "Teflon" "Foam"],EpsilonR=... [4.80 2.10 1.03],Thickness=[0.002 0.004 0.001],... LossTangent=[0.0260 2e-04 1.5e-04]);
Add the three layer substrate to the patch antenna.
p.Substrate = sub; figure show(p)
Plot the radiation pattern of the antenna.
figure pattern(p,1.67e9)
Infinite Reflector Backed Dielectric Substrate Antenna
Design a dipole antenna backed by a dielectric substrate and an infinite reflector.
Create a dipole antenna of length, 0.15 m, and width, 0.015 m.
d = dipole(Length=0.15,Width=0.015,Tilt=90,TiltAxis=[0 1 0]);
Create a reflector using the dipole antenna as an exciter and the dielectric, teflon
as the substrate.
t = dielectric("Teflon")
t = dielectric with properties: Name: 'Teflon' EpsilonR: 2.1000 LossTangent: 2.0000e-04 Thickness: 0.0060 For more materials see catalog
rf = reflector(Exciter=d,Spacing=7.5e-3,Substrate=t);
Set the groundplane length of the reflector to inf
. View the structure.
rf.GroundPlaneLength = inf; show(rf)
Calculate the radiation pattern of the antenna at 70 MHz.
pattern(rf,70e6)
Antenna On Dielectric Substrate - Compare Gain Values
Compare the gain values of a dipole antenna in free space and dipole antenna on a substrate.
Design a dipole antenna at a frequency of 1 GHz.
d = design(dipole,1e9); l_by_w = d.Length/d.Width; d.Tilt = 90; d.TiltAxis = [0 1 0];
Plot the radiation pattern of the dipole in free space at 1 GHz.
figure pattern(d,1e9);
Use FR4 as the dielectric substrate.
t = dielectric("FR4")
t = dielectric with properties: Name: 'FR4' EpsilonR: 4.8000 LossTangent: 0.0260 Thickness: 0.0060 For more materials see catalog
eps_r = t.EpsilonR;
lambda_0 = physconst("lightspeed")/1e9;
lambda_d = lambda_0/sqrt(eps_r);
Adjust the length of the dipole based on the wavelength.
d.Length = lambda_d/2; d.Width = d.Length/l_by_w;
Design a reflector at 1 GHz with the dipole as the exciter and FR4 as the substrate.
rf = reflector(Exciter=d,Spacing=7.5e-3,Substrate=t); rf.GroundPlaneLength = lambda_d; rf.GroundPlaneWidth = lambda_d/4; figure show(rf)
Remove the groundplane for plotting the gain of the dipole on the substrate.
rf.GroundPlaneLength = 0; show(rf)
Plot the radiation pattern of the dipole on the substrate at 1 GHz.
figure pattern(rf,1e9);
Compare the gain values.
Gain of the dipole in free space = 2.11 dBi
Gain of the dipole on substrate = 1.93 dBi
Input Arguments
material
— Material from dielectric catalog
"Air"
(default) | single dielectric | multiple dielectrics
Material from the dielectric catalog, specified as one or more dielectrics
from the DielectricCatalog
object
with predefined properties. You can specify multiple dielectric layers and
create an array of dielectrics.
Example:
"FR4"
Example: "FR4","Teflon"
Example: [dielectric("FR4"
)
dielectric("Teflon"
)]
Data Types: string
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: Name="Air"
Name
— Name of dielectric material
string (default) | cell array
Name of the dielectric material you want to specify in the output, specified as a string.
Example: "Taconic_TLC"
Data Types: string
EpsilonR
— Relative permittivity of dielectric material
1
(default) | positive scalar | vector
Relative permittivity of the dielectric material, specified as a positive scalar or vector.
Example: 4.8000
Data Types: double
LossTangent
— Loss in dielectric material
0
(default) | scalar | vector
Loss in the dielectric material, specified as a scalar or vector.
Note
In Antenna Toolbox™, the upper limit to loss tangent value is 0.03.
Example: 0.0260
Data Types: double
Thickness
— Thickness of dielectric material
0.0060
(default) | scalar in meters | vector in meters
Thickness of the dielectric material along default z-axis, specified as a scalar or vector in meters. This property applies only when you call the function with no output arguments.
Example:
0.05
Data Types: double
Output Arguments
d
— Dielectric material
object
Dielectric material, returned as an object. You can use the dielectric material object to add dielectric material to an antenna.
Version History
Introduced in R2016a
See Also
Ouvrir l'exemple
Vous possédez une version modifiée de cet exemple. Souhaitez-vous ouvrir cet exemple avec vos modifications ?
Commande MATLAB
Vous avez cliqué sur un lien qui correspond à cette commande MATLAB :
Pour exécuter la commande, saisissez-la dans la fenêtre de commande de MATLAB. Les navigateurs web ne supportent pas les commandes MATLAB.
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)