diff --git a/inductor.html b/inductor.html index 0ce02d7..3536f43 100644 --- a/inductor.html +++ b/inductor.html @@ -7,7 +7,7 @@ -
Miguel VK3CPU - RF Inductor Calculator
[Wire AWG] [Coax Metric]
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Miguel VK3CPU - RF Inductor Calculator
[Wire AWG] [Wire SWG] [Coax Metric]
diff --git a/inductor_imp.html b/inductor_imp.html index 98bbf12..525bd50 100644 --- a/inductor_imp.html +++ b/inductor_imp.html @@ -7,7 +7,7 @@ -
Miguel VK3CPU - RF Inductor Calculator
[Wire Metric] [Coax Metric]
+
Miguel VK3CPU - RF Inductor Calculator
[Wire Metric] [Wire SWG] [Coax Metric]
diff --git a/inductor_lrg.html b/inductor_lrg.html index e5a8dfa..1d991f7 100644 --- a/inductor_lrg.html +++ b/inductor_lrg.html @@ -7,7 +7,7 @@ -
Miguel VK3CPU - RF Inductor Calculator
[Wire AWG] [Wire Metric]
+
Miguel VK3CPU - RF Inductor Calculator
[Wire Metric] [Wire AWG] [Wire SWG]
diff --git a/inductor_swg.html b/inductor_swg.html new file mode 100644 index 0000000..c3b1d14 --- /dev/null +++ b/inductor_swg.html @@ -0,0 +1,467 @@ + + + + + + VK3CPU RF Inductor Calculator + + + +
Miguel VK3CPU - RF Inductor Calculator
[Wire Metric] [Wire AWG] [Coax Metric]
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+ Notes:
+ RF Inductor Calculator was developed to help users predict the RF characteristics of a single-layer solenoid-style air-core inductor.

+ Inputs via the slider widgets: +
    +
  • ⌀a : Conductor diameter slider changes SWG from 0-50. Actual diameter displayed in decimal inches.
    • +
  • ⌀b : Loop diameter in decimal inches (inches).
    • +
  • c/a : 'c' is the winding-to-winding distance, measured from the conductor mid-points. The 'a' is the conductor diameter, so 'c/a' is the spacing ratio. (c/a >= 1.1) + A low-value will increase the resistance due to the proximity effect.
    • +
  • N : Number of turns or windings.
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  • f : The frequency of interest (MHz) for some of the calculations.
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Characteristics on the left are independent of frequency, while the characteristics on the right are dependent on the selected frequency.

+ Each of the graphic representations attempt to keep the relative geometry correct, without exceeding the drawing boundary. The coil diameter + relative to the conductor diameter are representative.

+ Calculated dimensions: +
    +
  • ⌀o : Outer loop diameter (inches)
    • +
  • ⌀i : Inner loop diameter (inches) - corresponds to the diameter of the winding former.
    • +
  • c : Distance between windings, measured from the conductor centers (inches).
    • +
  • ℓ : Length of the coil (inches). Equal to c x N.
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+ Calculated parameters: +
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  • L : Inductance is calculated using Nagaoka's equation incorporating his coefficient.
    • +
  • C : Capacitance is calculated using Knight's 2016 paper on self-resonance and self-capacitance of solenoid coils.
    • +
  • Rdc : DC resistance is calculated using conductor length divided by the conductor cross-sectional area, assuming a copper conductor.
    • +
  • SRF : Self-resonant frequency (MHz) for the unloaded coil. Currently using a lumped reactances model. (Looking into modifying the model to + use the conductor length and velocity factor as described by Knight (2016).
    • +
  • Xₗ : Inductive reactance at the given frequency. (Ω)
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  • |Z| : Impedance at the given frequency. (Ω)
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  • δ : Skin depth due to skin effect (μm)
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  • Rac : AC resistance is calculated using the skin effect and proximity resistance from empirical data collected by Medhurst using the spacing ratio, and length-to-diameter ratio.
    • +
  • Q : Quality factor of device, based on reactance (X) ÷ resistance (Rac) at the given frequency.
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