Michael Thomas Flanagan's Java Scientific Library

TransmissionLine Class:      Transmission Line Super-Class

      

Last update: 7 April 2008                                                                                                                              Main Page of Michael Thomas Flanagan's Java Library

This class provides, for a generalised transmission line with
  • distributed resistance, R ohms/metre
  • distributed inductance, L henrys/metre
  • terminating load of impedance Zload ohms
  • distributed conductance, G siemens/metre
  • distributed capacitance, C farads/metre
  • length, l metres
                
the methods for obtaining:
  • Characteristic impedance, Zo
  • Input impedance, Zi
  • Shorted line impedance, Zload = 0
  • Open line impedance, Zload = ∞
  • Quater-wave line impedance
  • Half-wave line impedance
  • Wavelength, λ
  • Transmission matrix (ABCD matrix)
  • Distributed impedance, R + jωL
  • Distributed admittance, G + jωC
  • Reflection coefficient, ρ
  • Standing-wave ratio
  • Attenuation constant, α
  • Phase constant, β
  • Propagation constant, γ = α + jβ
  • Phase velocity, vp
  • Group velocity, vg
for
  • a generalised line, as depicted above (R > 0, G > 0)
  • an ideal line (R = 0, G = 0)
  • a low loss line (R/ωL << 1, G/ωC << 1)
where ω is the radial frequency of a cosinusoidal signal of frequency f Hz. The symbol, j, is used on this page to represent the square root of minus one.

This class, TransmissionLine, is the superclass for the subclasses
The methods for the calculation of standard component impedances and for combining impedances may be found in the class Impedance and methods of their phasor representation and manipulation may be found in the class Phasor.

import statement: import flanagan.circuits.TransmissionLine;
Related classes

SUMMARY OF CONSTRUCTORS AND METHODS
Constructors public void TransmissionLine()
public void TransmissionLine(String title)
Instance title public void setTitle(String title)
public String getTitle()
Frequency, f public void setFrequency(double frequency)
public double getFrequency()
public double getRadialFrequency()
Load impedance, Zload public void setLoadImpedance(double impedance)
public void setLoadImpedance(Complex impedance)
public Complex getLoadImpedance()
Line length, l public void setLineLength(double length)
public double getLineLength()
Distributed resistance, R public void setDistributedResistance(double resistance)
public double getDistributedResistance()
Distributed conductance, G public void setDistributedConductance(double conductance)
public double getDistributedConductance()
Distributed inductance, L public void setDistributedInductance(double inductance)
public double getDistributedInductance()
Distributed capacitance, C public void setDistributedCapacitance(double capacitance)
public double getDistributedCapacitance()
Distributed impedance, R + jωL public Complex getDistributedImpedance()
Distributed admittance, G + jωC public Complex getDistributedAdmittance()
Characteristic impedance, Zo public Complex getCharacteristicImpedance()
public Complex getIdealCharacteristicImpedance()
public double getIdealCharacteristicImpedanceAsReal()
public Complex getLowLossCharacteristicImpedance()
Input impedance, Zi public Complex getInputImpedance()
public Complex getIdealInputImpedance()
public Complex getLowLossInputImpedance()
Shorted line impedance, Zload = 0 public Complex getShortedLineImpedance()
public Complex getIdealShortedLineImpedance()
public Complex getLowLossShortedLineImpedance()
Open line impedance, Zload = ∞ public Complex getOpenLineImpedance()
public Complex getIdealOpenLineImpedance()
public Complex getLowLossOpenLineImpedance()
Line signal wavelength, λ public double getWavelength()
public double getIdealWavelength()
public double getLowLossWavelength()
Quarter-wave line impedance public Complex getQuarterWaveLineImpedance()
public Complex getIdealQuarterWaveLineImpedance()
public Complex getLowLossQuarterWaveLineImpedance()
Half-wave line impedance public Complex getHalfWaveLineImpedance()
public Complex getIdealHalfWaveLineImpedance()
public Complex getLowLossHalfWaveLineImpedance()
Reflection coefficient public Complex getReflectionCoefficient()
public Complex getIdealReflectionCoefficient()
public Complex getLowLossReflectionCoefficient()
Standing-wave ratio public double getStandingWaveRatio()
public double getIdealStandingWaveRatio()
public double getLowLossStandingWaveRatio()
Attenuation constant, α public double getAttenuationConstant()
public double getIdealAttenuationConstant()
public double getLowLossAttenuationConstant()
Phase constant, β public double getPhaseConstant()
public double getIdealPhaseConstant()
public double getLowLossPhaseConstant()
Propagation constant, γ = α + jβ public Complex getPropagationConstant()
public Complex getIdealPropagationConstant()
public Complex getLowLossPropagationConstant()
Phase velocity, vp public double getPhaseVelocity()
public double getIdealPhaseVelocity()
public double getLowLossPhaseVelocity()
Group velocity, vg public double getGroupVelocity()
public void setDelta(double delta)
public double getGroupPhaseVelocity()
public double getLowLossGroupVelocity()
Transmission matrix
(ABCD matrix) 		public ComplexMatrix getABCDmatrix()
public ComplexMatrix getIdealABCDmatrix()
public ComplexMatrix getLowLossABCDmatrix()
Segment length public void setSegmentLength(double segLength)
Segment output voltage public void setOutputVoltage(Phasor voltage)
public void setOutputVoltage(Complex voltage)
public void setOutputVoltage(double magnitude, double phase)
Segment output current public void setOutputCurrent(Phasor current)
public void setOutputCurrent(Complex current)
public void setOutputCurrent(double magnitude, double phase)
Segment input voltage and current public Phasor[] getInputVandIasPhasor()
public Phasor[] getInputVandIasPhasor(double segmentLength)
public Complex[] getInputVandIasComplex()
public Complex[] getInputVandIasComplex(double segmentLength)
public double[] getInputVandIasReal()
public double[] getInputVandIasReal(double segmentLength)
public double[] getInputVandIasMagnitudeAndPhase()
public double[] getInputVandIasMagnitudeAndPhase(double segmentLength)
Segment input voltage public Phasor getInputVoltageAsPhasor()
public Complex getInputVoltageAsComplex()
public double getInputVoltageAsReal()
public double[] getInputVoltageAsMagnitudeAndPhase()
Segment input current public Phasor getInputCurrentAsPhasor()
public Complex getInputCurrentAsComplex()
public double getInputCurrentAsReal()
public double[] getInputCurrentAsMagnitudeAndPhase()
Deep Copy public TransmissionLine copy()
public Object clone()



CONSTRUCTORS

 public TransmissionLine()
Usage:                      TransmissionLine tl = new TransmissionLine();
Creates an instance of TransmissionLine with a default title, "Transmission Line".

public TransmissionLine(String title)
Usage:                      TransmissionLine tl = new TransmissionLine(title);
Creates an instance of TransmissionLine with a user supplied title through the argument title.


INSTANCE TITLE

 public void setTitle(String title)
Usage:                      tl.setTitle(title);
Resets the title of the instance, tl, of TransmissionLine to a user supplied title through the argument title. The default title is "Transmission Line".

public String getTitle()
Usage:                      title = tl.getTitle();
Returns the title of the instance of TransmissionLine, tl.


FREQUENCY, f

 public void setFrequency(double frequency)
Usage:                      tl.setFrequency(frequency);
A method for entering the frequency of the signal [frequency], f, in Hz. This method also calculates the radial frequency, ω = 2πf.

public double getFrequency()
Usage:                      freq = tl.getFrequency();
Returns the frequency, f, in Hz.

public double getRadialFrequency()
Usage:                      freq = tl.getRadialFrequency();
Returns the radial frequency, ω [2πf].


LOAD IMPEDANCE, Zload

 public void setLoadImpedance(double impedance)
public void setLoadImpedance(Complex impedance)
Usage:                      tl.setLoadImpedance(impedance);
A method for entering the impedance of the load [impedance], Zload, in ohms. The impedance may be entered as real (pure resistance) or as Complex (complex impedance).

public Complex getLoadImpedance()
Usage:                      freq = tl.getFrequency();
Returns the complex impedance of the load, Zload, in ohms.


LINE LENGTH, l

 public void setLineLength(double length)
Usage:                      tl.setLineLength(length);
A method for entering the length of the line [length], l, in metres.

public Complex getLineLength()
Usage:                      length = tl.getLineLength();
Returns the length of the line, l, in metres.


DISTRIBUTED RESISTANCE, R

 public void setDistributedResistance(double resistance)
Usage:                      tl.setDistributedResistance(resistance);
A method for entering the distributed resistance [resistance], R, in ohms per metre. The default value is zero.

Methods that return the resistance of wires or plates of metals and alloys commonly used in electrical and electronic engineering may found in the class Impedance. The present list is
  • aluminium
  • antimony
  • brass
  • cobalt
  • constantan
  • copper - annealed
  • copper - hard drawn
  • German silver
  • gold
  • iron
  • lead
  • magnesium
  • managanin
  • mercury
  • molybdenum - drawn
  • Monel metal
  • Nichrome™
  • nickel
  • palladium
  • phosphor bronze
  • platinum
  • silver
  • steel: B B
  • steel: E B B
  • steel: manganese
  • steel: Siemens-Martin
  • tantalum
  • Therlo™
  • tin
  • tungsten - drawn
  • zinc
public Complex getDistributedResistance()
Usage:                      dres = tl.getDistributedResistance();
Returns the distributed resistance, R, in ohms per metre.


DISTRIBUTED CONDUCTANCE, G

 public void setDistributedConductance(double conductance)
Usage:                      tl.setDistributedConductance(conductance);
A method for entering the distributed inductance [conductance], R, in siemens per metre. The default value is zero.

public Complex getDistributedConductance()
Usage:                      dcon = tl.getDistributedConductance();
Returns the distributed conductance, G, in siemens per metre.


DISTRIBUTED INDUCTANCE, L

 public void setDistributedInductance(double inductance)
Usage:                      tl.setDistributedInductance(inductance);
A method for entering the distributed inductance [inductance], R, in henrys per metre.

public Complex getDistributedInductance()
Usage:                      dind = tl.getDistributedInductance();
Returns the distributed inductance, L, in henrys per metre.


DISTRIBUTED CAPACITANCE, C

 public void setDistributedCapacitance(double capacitance)
Usage:                      tl.setDistributedCapacitance(capacitance);
A method for entering the distributed inductance [capacitance], R, in farads per metre.

public Complex getDistributedCapacitance()
Usage:                      dcap = tl.getDistributedCapacitance();
Returns the distributed capacitance, C, in farads per metre.


DISTRIBUTED IMPEDANCE, R + jωL

 public Complex getDistributedImpudence()
Usage:                      dimp = tl.getDistributedImpedance();
Returns the distributed impedance, R + jωL, in ohms per metre.


DISTRIBUTED ADMITTANCE, G + jωC

 public Complex getDistributedAdmittance()
Usage:                      dadm = tl.getDistributedAdmittance();
Returns the distributed admittance, G + jωC, in siemens per metre.


CHARACTERISTIC IMPEDANCE, Zo

 General Line
public Complex getCharacteristicImpedance()
Usage:                      zed0 = tl.getcharacteristicImpedance();
Returns the characteristic impedance, Zo, in ohms, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealCharacteristicImpedance()
Usage:                      zed0 = tl.getIdealCharacteristicImpedance();
Returns the characteristic impedance, Zo, in ohms, for an ideal transmission line:

as a complex number, Zo + j0 [Complex].

public double getIdealCharacteristicImpedanceAsReal()
Usage:                      zed0 = tl.getIdealCharacteristicImpedanceAsReal();
Returns the characteristic impedance, Zo, in ohms, for an ideal transmission line:

as a real number [double].

Low Loss Line
public Complex getLowLossCharacteisticImpedance()
Usage:                      zed0 = tl.getLowLossCharacteristicImpedance();
Returns the characteristic impedance, Zo, in ohms, for a low loss transmission line:



INPUT IMPEDANCE, Zi

 General Line
public Complex getInputImpedance()
Usage:                      zedi = tl.getInputImpedance();
Returns the input impedance, Zi, in ohms, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealInputImpedance()
Usage:                      zedi = tl.getIdealInputImpedance();
Returns the input impedance, Zi, in ohms, for an ideal transmission line:


Low Loss Line
public Complex getLowLossInputImpedance()
Usage:                      zedi = tl.getLowLossInputImpedance();
Returns the input impedance, Zi, in ohms, for a low loss transmission line:



SHORTED LINE IMPEDANCE, Zload = 0

 General Line
public Complex getShortedLineImpedance()
Usage:                      zedShort = tl.getShortedLineImpedance();
Returns the shorted line impedance, in ohms, for the generalised transmission line depicted at the top of this page:
Zotanh(γl)

Ideal Line
public Complex getIdealShortedLineImpedance()
Usage:                      zedShort = tl.getIdealShortedLineImpedance();
Returns the shorted line impedance, in ohms, for an ideal transmission line:
jZotan(βl)

Low Loss Line
public Complex getLowLossShortedLineImpedance()
Usage:                      zedShort = tl.getLowLossShortedLineImpedance();
Returns the shorted line impedance, in ohms, for a low loss transmission line:



OPEN LINE IMPEDANCE, Zload = ∞

 General Line
public Complex getOpenLineImpedance()
Usage:                      zedOpen = tl.getOpenLineImpedance();
Returns the open line impedance, in ohms, for the generalised transmission line depicted at the top of this page:
Zocoth(γl)

Ideal Line
public Complex getIdealOpenLineImpedance()
Usage:                      zedOpen = tl.getIdealOpenLineImpedance();
Returns the open line impedance, in ohms, for an ideal transmission line:
−jZocot(βl)

Low Loss Line
public Complex getLowLossOpenLineImpedance()
Usage:                      zedOpen = tl.getLowLossOpenLineImpedance();
Returns the open line impedance, in ohms, for a low loss transmission line:



WAVELENGTH, λ

 General Line
public Complex getWavelength()
Usage:                      lambda = tl.getWavelength();
Returns the wavelength, λ = 2π /β, in metres, of a cosinusoidal signal of radial frequency, ω, on the generalised transmission line depicted at the top of this page:

Ideal Line
public Complex getIdealOpenLineImpedance()
Usage:                      lambda = tl.getIdealWavelength();
Returns the wavelength, λ = 2π /β, in metres, of a cosinusoidal signal of radial frequency, ω, on an ideal transmission line:

Low Loss Line
public Complex getLowLossOpenLineImpedance()
Usage:                      lambda = tl.getLowLossWavelength();
Returns the wavelength, λ = 2π /β, in metres, of a cosinusoidal signal of radial frequency, ω, on a low loss transmission line:


QUARTER−WAVE LINE IMPEDANCE

 General Line
public Complex getQuarterWaveLineImpedance()
Usage:                      zedQuarterWave = tl.getQuarterWaveLineImpedance();
Returns the impedance of a quarter-wave line, in ohms, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealQuarterWaveLineImpedance()
Usage:                      zedQuarterWave = tl.getIdealQuarterWaveLineImpedance();
Returns the impedance of a quarter-wave line, in ohms, for an ideal transmission line:


Low Loss Line
public Complex getLowLossQuarterWaveLineImpedance()
Usage:                      zedQuarterWave = tl.getLowLossQuarterWaveLineImpedance();
Returns the impedance of a quarter-wave line, in ohms, for a low loss transmission line:



HALF−WAVE LINE IMPEDANCE

 General Line
public Complex getHalfWaveLineImpedance()
Usage:                      zedHalfWave = tl.getHalfWaveLineImpedance();
Returns the impedance of a half-wave line, in ohms, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealHalfWaveLineImpedance()
Usage:                      zedHalfWave = tl.getIdealHalfWaveLineImpedance();
Returns the impedance of a half-wave line, in ohms, for an ideal transmission line:
Zload

Low Loss Line
public Complex getLowLossHalfWaveLineImpedance()
Usage:                      zedHalfWave = tl.getLowLossHalfWaveLineImpedance();
Returns the impedance of a half-wave line, in ohms, for a low loss transmission line:



REFLECTION COEFFICIENT, ρ

 General Line
public Complex getReflectionCoefficient()
Usage:                      reflCoeff = tl.getReflectionCoefficient();
Returns the reflection coefficient, ρ, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealReflectionCoefficient()
Usage:                      reflCoeff = tl.getIdealReflectionCoefficient();
Returns the reflection coefficient, ρ, for an ideal transmission line:


Low Loss Line
public Complex getLowLossReflectionCoefficient()
Usage:                      reflCoeff = tl.getLowLossReflectionCoefficient();
Returns the reflection coefficient, ρ, for a low loss transmission line:



STANDING−WAVE RATIO

 General Line
public Complex getStandingWaveRatio()
Usage:                      swr = tl.getStandingWaveRatio();
Returns the standing-wave ratio, ρ, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealStandingWaveRatio()
Usage:                      swr = tl.getIdealStandingWaveRatio();
Returns the standing-wave ratio, ρ, for an ideal transmission line:


Low Loss Line
public Complex getLowLossStandingWaveRatio()
Usage:                      swr = tl.getLowLossStandingWaveRatio();
Returns the standing-wave ratio, ρ, for a low loss transmission line:



ATTENUATION CONSTANT, α

 General Line
public double getAttenuationConstant()
Usage:                      alpha = tl.getAttenuationConstant();
Returns the attenuation constant, α, for the generalised transmission line depicted at the top of this page:


Ideal Line
public double getIdealAttenuationConstant()
Usage:                      alpha = tl.getIdealAttenuationConstant();
Returns the attenuation constant, α, for an ideal transmission line:
α = 0

Low Loss Line
public double getLowLossAttenuationConstant()
Usage:                      alpha = tl.getLowLossAttenuationConstant();
Returns the attenuation constant, α, for a low loss transmission line:



PHASE CONSTANT, β

 General Line
public double getPhaseConstant()
Usage:                      beta = tl.getPhaseConstant();
Returns the phase constant, β, for the generalised transmission line depicted at the top of this page:


Ideal Line
public double getIdealPhaseConstant()
Usage:                      alpha = tl.getIdealPhaseConstant();
Returns the phase constant, β, for an ideal transmission line:


Low Loss Line
public double getLowLossPhaseConstant()
Usage:                      beta = tl.getLowLossPhaseConstant();
Returns the phase constant, β, for a low loss transmission line:



PROPAGATION CONSTANT, γ = α + jβ

 General Line
public Complex getPropagationConstant()
Usage:                      gamma = tl.getPropagationConstant();
Returns the propagation constant, γ, for the generalised transmission line depicted at the top of this page:


Ideal Line
public Complex getIdealPropagationConstant()
Usage:                      gamma = tl.getIdealPropagationConstant();
Returns the propagation constant, γ, for an ideal transmission line:


Low Loss Line
public Complex getLowLossPropagationConstant()
Usage:                      gamma = tl.getLowLossPropagationConstant();
Returns the propagation constant, γ, for a low loss transmission line:



PHASE VELOCITY, vp

 General Line
public double getPhaseVelocity()
Usage:                      vp = tl.getPhaseVelocity();
Returns the phase velocity, vp in metres per second, for the generalised transmission line depicted at the top of this page:


Ideal Line
public double getIdealPhaseVelocity()
Usage:                      vg = tl.getIdealPhaseVelocity();
Returns the phase velocity, vp in metres per second, for an ideal transmission line:


Low Loss Line
public double getLowLossPhaseVelocity()
Usage:                      vg = tl.getLowLossPhaseVelocity();
Returns the phase velocity, vp in metres per second, for a low loss transmission line:



GROUP VELOCITY, vg

 General Line
public double getPhaseVelocity()
Usage:                      vg = tl.getGroupVelocity();
Returns the group velocity, vg in metres per second, for the generalised transmission line depicted at the top of this page:


If the distributed resistance, R, and the distributed conductance, G, are equal to zero (an ideal line) the group velocity is evaluated as

otherwise an approximation, using numerically differentiation, is evaluated as

where βω(1 − δ) and βω(1 + δ) are the values of the phase constant, β, evaluated at ω(1 − δ) and ω(1 + δ) respectively. The default value of the numerical incremental factor, δ, is 0.001 but this may be reset using the method, setDelta, described below.

public void setDelta(double delta)
Usage:                      tl.setDelta(delta);
A method that allows the incremental factor, δ, used in the numerical approximation of the group velocity on a general line (see above), to be reset. The default value is 0.001.

Ideal Line
public double getIdealGroupVelocity()
Usage:                      vg = tl.getIdealGroupVelocity();
Returns the group velocity, vg in metres per second, for an ideal transmission line:


Low Loss Line
public double getLowLossGroupVelocity()
Usage:                      vg = tl.getLowLossGroupVelocity();
Returns the group velocity, vg in metres per second, for a low loss transmission line:



TRANSMISSION (ABCD) MATRIX

 See ComplexMatrix documentation for details of complex matrix manipulations, e.g. multiplication, using theComplexMatrix class.

General Line
public ComplexMatrix getABCDmatrix()
Usage:                      ComplexMatrix abcd = tl.getABCDmatrix();
Returns the transmission matrix (ABCD matrix) for the generalised transmission line depicted at the top of this page:

where Zo is the characteristic impedance, γ is the propagation constant and Λ is the length of segment to which the transmission matrix is applied.

Ideal Line
public ComplexMatrix getIdealABCDmatrix()
Usage:                      ComplexMatrix abcd = tl.getIdealABCDmatrix();
Returns the transmission matrix (ABCD matrix) for an ideal transmission line:

where Zo is the characteristic impedance, β is the phase constant and Λ is the length of segment to which the transmission matrix is applied.

Low Loss Line
public ComplexMatrix getLowLossABCDmatrix()
Usage:                      ComplexMatrix abcd = tl.getLowLossABCDmatrix();
Returns the transmission matrix (ABCD matrix) for a low loss transmission line:

where Zo is the characteristic impedance, γ is the propagation constant and Λ is the length of segment to which the transmission matrix is applied.


SEGMENT LENGTH, Λ

 public void setSegmentLength(double length)
Usage:                      tl.setSegmentLength(length);
A method for entering the length of a line segment [length], Λ, in metres. The ABCD matrix methods require a segment length.


SEGMENT INPUT VOLTAGE AND INPUT CURRENT

 These methods all calculate and return the input voltage, Vo, and current, Io, to a segment of line, of length Λ, with an output voltage, VΛ, and an output current, IΛ, using the relationship

or, if the distributed resistance, R, and the distributed conductance, G, are both equal to zero,

where γ is the propagation constant and β is the phase constant. The methods require the output voltage, VΛ, the output current, IΛ, and, if it is not the method's argument, the segment length, Λ, to have been previously entered.

public Phasor[] getInputVandIasPhasor()
Usage:                     Phasor[] vAndI = tl.getInputVandIasPhasor();
public Phasor[] getInputVandIasPhasor(double segmentLength)
Usage:                     Phasor[] vAndI = tl.getInputVandIasPhasor(segmentLength);
Returns the input voltage Vo as a phasor (magnitude∠phase) [Phasor] vAndI[0] and the input current Io as a phasor vAndI[1].

public Complex[] getInputVandIasComplex()
Usage:                     Complex[] vAndI = tl.getInputVandIasComplex();
public Complex[] getInputVandIasComplex(double segmentLength)
Usage:                     Complex[] vAndI = tl.getInputVandIasComplex(segmentLength);
Returns the input voltage Vo in rectangular complex form (magnitude.cos(phase) + j.magnitude.sin(phase)) [Complex] vAndI[0] and the input current Io as the complex number vAndI[1].

public double[] getInputVandIasReal()
Usage:                     double[] vAndI = tl.getInputVandIasReal();
public double []getInputVandIasReal(double segmentLength)
Usage:                     double[] vAndI = tl.getInputVandIasReal(segmentLength);
Returns the input voltage Vo as real, i.e. as magnitude.cos(phase), in vAndI[0] and the input current Io as real in vAndI[1].

public double[] getInputVandIasMagnitudeAndPhase()
Usage:                     double[] vAndI = tl.getInputVandIasReal();
public double[] getInputVandIasMagnitudeAndPhase(double segmentLength)
Usage:                     double[] vAndI = tl.getInputVandIasReal(segmentLength);
Returns the magnitude and phase of the input voltage Vo in vAndI[0] and vAndI[1] and the magnitude and phase of the input current in vAndI[2] and vAndI[3].


SEGMENT INPUT VOLTAGE

 These methods all calculate and return the input voltage, Vo, to a segment of line, of length Λ, with an output voltage, VΛ, and an output current, IΛ, using the relationship

or, if the distributed resistance, R, and the distributed conductance, G, are both equal to zero,

where γ is the propagation constant and β is the phase constant. The methods require the output voltage, VΛ, the output current, IΛ, and the segment length, Λ, to have been previously entered.

public Phasor getInputVoltageAsPhasor()
Usage:                     Phasor voltage = tl.getInputVoltageAsPhasor();
public Phasor getInputVoltageAsPhasor(double segmentLength)
Returns the input voltage Vo as a phasor (magnitude∠phase) [Phasor].

public Complex getInputVoltageAsComplex()
Usage:                     Complex voltage = tl.getInputVoltageAsComplex();
public Complex getInputVoltageAsComplex(double segmentLength)
Returns the input voltage Vo in rectangular complex form (magnitude.cos(phase) + j.magnitude.sin(phase)) [Complex].

public double getInputVoltageAsReal()
Usage:                     double voltage = tl.getInputVoltageAsReal();
public double getInputVoltageAsReal(double segmentLength)
Returns the input voltage Vo as real, i.e. as magnitude.cos(phase).

public double[] getInputVoltageAsMagnitudeAndPhase()
Usage:                     double voltage[] = tl.getInputVoltageAsReal();
Returns the magnitude and phase of the input voltage Vo in voltage[0] and voltage[1].


SEGMENT INPUT CURRENT

 These methods all calculate and return the input current, Io, to a segment of line, of length Λ, with an output voltage, VΛ, and an output current, IΛ, using the relationship

or, if the distributed resistance, R, and the distributed conductance, G, are both equal to zero,

where γ is the propagation constant and β is the phase constant. The methods require that the output voltage, VΛ, the output current, IΛ, and the segment length, Λ, to have been previously entered.

public Phasor getInputCurrentAsPhasor()
Usage:                     Phasor current = tl.getInputCurrentAsPhasor();
public Phasor getInputCurrentAsPhasor(double segmentLength)
Returns the input current Io as a phasor (magnitude∠phase) [Phasor].

public Complex getInputCurrentAsComplex()
Usage:                     Complex current = tl.getInputCurrentAsComplex();
public Complex getInputCurrentAsComplex(double segmentLength)
Returns the input current Io in rectangular complex form (magnitude.cos(phase) + j.magnitude.sin(phase)) [Complex].

public double getInputCurrentAsReal()
Usage:                     double current = tl.getInputCurrentAsReal();
public double getInputCurrentAsReal(double segmentLength)
Returns the input current Io as real, i.e. as magnitude.cos(phase).

public double[] getInputCurrentAsMagnitudeAndPhase()
Usage:                     double current[] = tl.getInputCurrentAsReal();
Returns the magnitude and phase of the input current Io in current[0] and current[1.


SEGMENT OUTPUT VOLTAGE

 public void setOutputVoltage(Phasor voltage)
public void setOutputVoltage(Complex voltage)
public void setOutputVoltage(double magnitude, double phase)
Usage:                      tl.setOutputVoltage(voltage);
A method for entering the output voltage of a line segment to which the ABCD matrix is to be applied. The voltage [voltage] may be entered as a Phasor (magnitude∠phase), a Complex (magnitude.cos(phase)+j.magnitude.cos(phase)) or as the magnitude and phase.


SEGMENT OUTPUT CURRENT

 public void setOutputCurrent(Phasor current)
public void setOutputCurrent(Complex current)
public void setOutputCurrent(double magnitude, double phase)
Usage:                      tl.setOutputCurrent(current);
A method for entering the output current of a line segment to which the ABCD matrix is to be applied. The current [current] may be entered as a Phasor (magnitude∠phase), a Complex (magnitude.cos(phase)+j.magnitude.cos(phase)) or as the magnitude and phase.


DEEP COPY

public TransmissionLine copy()
public Object clone()

Copy a TransmissionLine
Usage:                      aa = bb.copy();
A deep copy of TransmissionLine, bb, is returned as aa.
This method is overridden in each subclass to ensure a true deep copy of the subclass.

Clone a TransmissionLine
Usage:                      aa = bb.clone();
A deep copy of TransmissionLine, bb, is returned as aa cast as Object.
This method overrides java.lang.Object.clone() and is overridden in each subclass to ensure a true deep copy of the subclass.


OTHER CLASSES USED BY THIS CLASS

 This class uses the following classes in this library:

This page was prepared by Dr Michael Thomas Flanagan