From: Mary ([email protected])
Date: Fri May 05 2000 - 14:13:36 PDT
Somone recently claimed that higher impedance transmission lines
radiate more because their impedance is closer to the 377-ohm
impedance of free space. This is not true. It is not possible
to judge anything about the radiation from a transmission line
based on the value of its characteristic impedance.
Characteristic impedance is the ratio of voltage to current in a
forward traveling wave. The ratio of electric to magnetic field
strength in a free-space transmission line is approximately
377 ohms regardless of what the characteristic impedance is.
Even if you were to build a transmission line with a 377-ohm
characteristic impedance, there is no reason to believe it would
radiate any better or worse than a 300-ohm or a 400-ohm line.
Mary
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