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Answer Posted / roshan singh
When a transmission line (cable) is terminated by an impedance that does not match the characteristic
impedance of the transmission line, not all of the power is absorbed by the termination. Part of the power
is reflected back down the transmission line. The forward (or incident) signal mixes with the reverse (or
reflected) signal to cause a voltage standing wave pattern on the transmission line. The ratio of the
maximum to minimum voltage is known as VSWR, or Voltage Standing Wave Ratio.
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