Which component in a transmitter is primarily responsible for transforming an electrical signal into radiated waves?

Which component in a transmitter is primarily responsible for transforming an electrical signal into radiated waves?

• A. Antenna
• B. Power supply
• C. Modulator
• D. Oscillator

Answer: (A)

The part that actually turns electrical signals into radio waves is the antenna. It takes the RF current and, with its elements shaped to match the signal, makes the charges accelerate back and forth in time. Those accelerating charges create changing electric and magnetic fields that propagate through space as electromagnetic waves. The other parts—oscillator, modulator, and power supply—provide the carrier signal, encode information, and supply power, but the radiation into free space comes from the antenna itself. Its size, shape, and impedance matching determine the frequency, polarization, and radiation pattern of the emitted waves.

The part that actually turns electrical signals into radio waves is the antenna. It takes the RF current and, with its elements shaped to match the signal, makes the charges accelerate back and forth in time. Those accelerating charges create changing electric and magnetic fields that propagate through space as electromagnetic waves. The other parts—oscillator, modulator, and power supply—provide the carrier signal, encode information, and supply power, but the radiation into free space comes from the antenna itself. Its size, shape, and impedance matching determine the frequency, polarization, and radiation pattern of the emitted waves.