Goto:   Inductance
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Format        Notes

Definition:

Equation

Parameters

Diagram

Calculate
Inductance:
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Parameter

Value

Units

Special Values

Inputs:

Ra
(array radius)

inchesmeterscentimetersmillimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

Rb (tube radius)

(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

Rc
(rod radius)

millimetersinchesmeterscentimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

N (#
of rods)

er (diel.
const.)

L
(length)

meterscentimetersmillimetersmicrometersnanometersinchesfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

Outputs:

L (inductance)

nH,
nanohenrysH, HenrysmH,
millihenrysuH, microhenryspH,
picohenrys____________________

C (capacitance)

nF,
nanofaradsF, FaradsmF,
millifaradsuF, microfaradspF,
picofarads____________________

Z
(impedance)

OhmskiloOhmsMegaOhmsmilliOhmsmicroOhmsnanoOhms____________________

Output
Format:
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Select
Format:

Scientific

Engineering

Fixed

Notes:
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Leave length at 1 meter to get L' and C' in per meter units.

You can enter all radii as diameters instead, since ratios are
taken.

Tube diameter can be smaller that array diameter, Ra and Rb are
switched in this
case.

The first term in the equation for L' is exactly the impedance of
coax with Ra and Rb.  So, you can think of the second term as the
addition inductance due to replacing one conductor with rods.

Sources:

Ron Boller who
gives his original source as
"Russel".

Capacitance is
my own derivation.

Copyright ?2006  Raymond J. Allen