Transmission Line Made from Round Wire (Wire-Wrap)
[file: round.mcd]
Formulas included in this spreadsheet:
-
Round wire characteristic impedance ZROUND()
-
Round wire propagation delay PROUND()
-
Round wire inductance LROUND()
-
Round wire capacitance CROUND()
Variables used:
-
d Diameter of wire (in.)
-
h Height of wire above
ground (in.)
-
x Length of wire (in.)
(We assume the wire is
suspended in air,
for which
the relative dielectric
constant is 1.00.)
Characteristic impedance of round
wire above ground plane (W):
Propagation delay per in. of round
wire above ground plane (s/in):
(assume air dielectric)
Inductance of round wire
above ground plane (H):
Capacitance of round wire
above ground plane (F):
___________________________________________________________________
Example round wire calculations
Diameter of AWG 30 wire (in.)
Length of wire (in.)
Height above ground (in.)
Characteristic impedance (W):
Total inductance (H):
Same result in nH:
Inductance per in. (H):
Total capacitance (F):
Same result in units pF:
Capacitance per in. (F):
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