What is the true statement about impedance matching?

• A. It maximizes power transfer and minimizes reflections.
• B. It minimizes conductor losses.
• C. It has no effect on system efficiency.
• D. It increases transmitter output impedance to infinity.

Answer: (A)

Impedance matching is about making the load impedance equal to the transmitter’s output impedance so RF energy is delivered efficiently. When the impedances are matched, the reflection coefficient is minimized (ideally zero), so almost all of the transmitter’s power goes into the load and very little is reflected back toward the source. That’s why the statement describing maximum power transfer and minimal reflections is the correct way to characterize impedance matching. It’s not primarily about reducing conductor losses, which come from the resistance and geometry of the conductors themselves, nor does it mean the system has no change in efficiency—mismatches cause reflections that waste power. It also doesn’t push the transmitter’s output impedance to infinity; instead, matching networks are used to present the load that makes the transmitter see its intended impedance, enabling efficient transfer.