dielectric

Dielectric material for use as substrate

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    Description

    Dielectric material used as a substrate in PCB components.

    Creation

    Syntax

    d = dielectric(material)
    d = dielectric(material1,...,materialN)
    d = dielectric(PropertyName=Value)

    Description

    d = dielectric(material) returns a dielectric object of the dielectric material for use as a substrate in PCB components.

    example

    d = dielectric(material1,...,materialN) returns a dielectric object of the specified dielectric materials.

    example

    d = dielectric(PropertyName=Value) returns dielectric materials based on the properties specified by one or more name-value pair arguments.

    example

    Input Arguments

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    Material from the dielectric catalog, specified as one of the values from the DielectricCatalog.

    Example: "FR4"

    Data Types: string | char | cell

    Properties

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    Name of the dielectric material you want to specify in the output, specified as a character vector or string.

    Example: Name="Taconic_TLC"

    Data Types: char | cell | string

    Relative permittivity of the dielectric material, specified as a real-valued vector.

    Example: EpsilonR=4.8000

    Data Types: double

    Loss in the dielectric material, specified as a vector.

    Example: LossTangent=0.0260

    Data Types: double

    Thickness of the dielectric material in meters along default z-axis, specified as a positive vector.

    Example: Thickness=0.05

    Data Types: double

    Specified frequency in Hz.

    Example: Frequency = 200e6

    Data Types: double

    For frequency dependent dielectrics use frequencyModel specified as a dispersion model value:

    • Constant for frequency independent dispersion model

    • DjordjevicSarkar to use the Djordjevic-Sarkar dispersion model

    • MeanDjordjevicSarkar to use the average value of the Djordjevic-Sarkar model over the frequency range of interest

    • TableDriven to use tabular data of dispersion vs. frequency.

    Example: d = dilectric("Name","FR4","FrequencyModel","DjordjevicSarkar")

    Data Types: string

    Object Functions

    getMaterialPropertiesGet material properties of dielectric

    Examples

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    Open Live Script

    Create shunt radial stub of type double.

    stub = stubRadialShunt(StubType='double');
stub.OuterRadius = [0.0085 0.0065];
stub.InnerRadius = [0.0012 0.0008];
stub.Angle       = [90 60];

    View shunt radial stub.

    show(stub)

    Plot s-parameters.

    spar = sparameters(stub,linspace(3e9,5e9,50));
rfplot(spar)

    Open Live Script

    Create and visualize a PCB stripline having frequency dependent dielectric substrate using a Djordjevic-Sarkar dispersion model.

    Create a PCB stripline object

    Use stripline from the RF PCB component catalog

    p = stripLine;

    Create the frequency dependent dielectric

    Use the dielectric function to create a dielectric substrate with FR4 material, using the Djordjevic-Sarkar dispersion model, with a specified frequency of 1 MHz.

    d = dielectric(Name ='FR4',EpsilonR=4.8,LossTangent=0.026,Frequency=1e6,FrequencyModel='DjordjevicSarkar',Thickness=0.006);
p.Substrate = d
    p = 
  stripLine with properties:

              Length: 0.0207
               Width: 0.0052
              Height: 0.0030
    GroundPlaneWidth: 0.0208
           Substrate: [1×1 dielectric]
           Conductor: [1×1 metal]

    Calculate s parameters

    Calculate the s parameters using the sparameters function over a frequency range of 1 GHz to 10 GHz

    s = sparameters(p,linspace(1e9,10e9,50));

    Plot the s parameters

    Plot the magnitude and phase angle of the s parameters over the frequency range

    figure
rfplot(s,'abs');

    Figure contains an axes object. The axes object with xlabel Frequency (GHz), ylabel Magnitude contains 4 objects of type line. These objects represent abs(S_{11}), abs(S_{21}), abs(S_{12}), abs(S_{22}).

    figure
rfplot(s,'angle');

    Figure contains an axes object. The axes object with xlabel Frequency (GHz), ylabel Angle (degrees) contains 4 objects of type line. These objects represent angle(S_{11}), angle(S_{21}), angle(S_{12}), angle(S_{22}).

    References

    [1] Djordjevic, D., Biljic, R., Likar-Smiljanic, V., Sarker,T., Wideband Frequency-Domain Characterization of FR-4 and Time-Domain Causality IEEE Transactions on Electromagnetic Compatibility, Vol. 43, No. 4, November 2001

    Version History

    Introduced in R2016a

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    See Also