This means that a 1-V transient coupled to both signal lines (common-mode) creates only 10 mV of differential-mode signal
. Lower grades of cable allow higher fractions of common-mode to differential-mode conversion.
A balanced signal differs from a differential signal because the desired differential-mode signal
The ratio of the common-mode signal to the resulting differential-mode signal
is a measure of the common-mode rejection, [a.sub.u].
If the input ports (ports 1 and 1') are excited by differential-mode signals
, the out-of-phase signals will be converted to in-phase signals when they pass through the 180[degrees] swap structure, then a virtual open appears at the symmetrical line T-T' and a wideband BPF is constructed.