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txlineDelayLossy

Create delay lossy transmission line

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    Description

    Use thetxlineDelayLossyobject to create a delay lossy transmission line. You can also use thetxlineDelayLossyobject to model a delay lossy transmission line in an RF system using therfbudgetobject or theRF Budget Analyzer应用程序。

    Creation

    Syntax

    dlytxline = txlineDelayLossy
    dlytxline = txlineDelayLossy(Name,Value)

    Description

    dlytxline= txlineDelayLossycreates a default delay lossy transmission line object.

    example

    dlytxline= txlineDelayLossy(Name,Value)setsPropertiesof the delay lossy transmission line using one or more name-value arguments. For example,dlytxline = txlineDelayLossy('Z0',75)creates a delay lossy transmission line with an impedance of75ohms.

    Properties

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    Name of the delay lossy transmission line, specified as a string scalar or character vector.

    Example:'Name','DLbased'

    Example:dlytxline.Name = 'DLbased'

    Characteristic impedance of the delay lossy transmission line, specified as a positive scalar in ohms.

    Example:'Z0',75

    Example:dlytxline.Z0 = 75

    Physical length of the delay lossy transmission line, specified as a positive scalar in meters.

    Example:'LineLength',0.0200

    Example:dlytxline.LineLength = 0.0200

    Time delay in the delay lossy transmission line, specified as a positive scalar in seconds.

    Example:'TimeDelay',3.7e-9

    Example:dlytxline.TimeDelay = 3.7e-9

    Resistance value per unit of length of the delay lossy transmission line, specified as a positive scalar in ohm/meter.

    Example:'Resistance',0.3400

    Example:dlytxline.Resistance = 0.3400

    This property is read-only.

    Number of input and output ports of the delay lossy transmission line, returned as positive scalar.

    This property is read-only.

    Terminals of the delay lossy transmission line, returned as a cell array.

    Object Functions

    sparameters Calculate S-parameters for RF data, network, circuit, and matching network objects
    groupdelay Group delay of S-parameter object or RF filter object orRF Toolboxcircuit object
    noisefigure Calculate noise figure of transmission lines, series RLC, and shunt RLC circuits

    Examples

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    Open Live Script

    Design a coaxial cable of0.5meters in length as a lossy transmission line with the characteristic impedance of48ohms.

    dlossy = txlineDelayLossy("Z0"，48,"LineLength"，500e-3);

    Calculate the noise figure at1GHz.

    nf = noisefigure(dlossy,1e9)
    nf = 0.0013

    Algorithms

    The delay lossy transmission line object calculates the S-parameters for the specified frequencies. This calculation is based on the delay line's line length, resistance, and time delay. The S-parameters are calculated using the equation given.

    S 11 = 0 S 12 = e - p S 21 = e - p S 22 = 0

    Here, p = α a + (i × β) .ɑainpis the attenuation coefficient andβis the wave number.

    The attenuation coefficient,ɑa，is related to the loss,ɑ，by

    α a = (linelength × resistance) (2Z)

    and the wave numberβis related to the time delay,D，by

    β = 2 × π × f × D

    wherefis the frequency range specified in the S-parameters input argument.

    版本历史

    Introduced in R2021a

    See Also

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