What does the term "bandwidth" refer to in wireless communication?

In wireless communication, "bandwidth" specifically refers to the range of frequencies that can be used for transmitting data. It quantifies the capacity of a communication channel, indicating how much data can be transmitted over that channel in a given amount of time. Bandwidth is measured in hertz (Hz) and corresponds to the difference between the highest and lowest frequencies in the range. A wider bandwidth allows more data to be sent simultaneously, facilitating faster data transmission rates and better overall communication performance.

The other options do not align with the definition of bandwidth. The physical size of the antenna is related to its capability to transmit and receive signals effectively but does not define bandwidth itself. The power of the transmitter pertains to the strength of the signal being sent, affecting how far and effectively a signal can travel but not the frequency range. Similarly, the distance a signal can travel is influenced by various factors like power and environmental conditions, rather than bandwidth directly. Therefore, the definition rooted in the range of frequencies is the fundamental aspect that defines bandwidth in wireless communication.