What does the term "SWR" stand for?

The term "SWR" stands for Standing Wave Ratio. This ratio is significant in the context of radio frequency (RF) communications and transmission lines. SWR is a measure of the efficiency of the power transfer from a transmitter to an antenna. It quantifies the relationship between the forward power (the power that is sent from the transmitter to the load) and the reflected power (the power that is reflected back from the load to the transmitter).

An SWR of 1:1 indicates perfect matching between the transmitter and the antenna, meaning all the power is transmitted effectively without any reflection. As the SWR value increases, it indicates more power is being reflected rather than transmitted, which can lead to inefficiencies and potential damage to the transmitter. Understanding SWR is crucial for ensuring optimal performance in RF systems.

The other terms in the options do not accurately reflect the correct definition of SWR, reinforcing that the correct term is indeed Standing Wave Ratio.