Which of the following can be a consequence of an improper impedance match in an antenna system?

An improper impedance match in an antenna system can lead to reduced power transmission. This occurs because when the impedance of the antenna does not match the impedance of the transmission line or the radio transmitter, some of the signal power is reflected back instead of being transmitted effectively into the antenna.

In a well-matched system, most of the power from the transmitter is radiated by the antenna. However, if there is a mismatch, it can result in standing waves along the transmission line, signifying that not all of the power is being utilized for radiation. This reflects a decrease in the effective power transmitted, leading to poorer overall performance and potentially limiting the range or effectiveness of the communication.

In contrast, increased radiation efficiency, improved Standing Wave Ratio (SWR), and having no effect on performance would not accurately describe the outcome of an improper impedance match. A mismatch typically leads to inefficiencies and degradation in performance, rather than improvements.