What is the role of an antenna in a transmitter system?

The role of an antenna in a transmitter system is primarily to radiate the keyed output of the transmitter. When a transmitter generates radio frequency (RF) signals, these signals are typically in the form of electric currents or voltages that need to be converted into electromagnetic waves for transmission through space. The antenna performs this critical function by taking the RF output from the transmitter and radiating it into the environment, allowing it to propagate and reach receiving antennas or devices.

The effectiveness of the antenna is crucial for efficient transmission, as it influences the range, direction, and quality of the transmitted signals. By radiating the RF energy, the antenna helps establish communication links by ensuring that the transmitted signals can be received and decoded by the intended recipient devices. This is a fundamental aspect of wireless communication systems, where antennas are integral to the transmission and reception of information.