🔍 Key Concepts

• Antenna radiation vs. loss (heat) in conductors • How engineers model an antenna as a resistor for power calculations • Difference between radiation resistance and ohmic (real) resistance

💭 Think About

• When power is fed into an antenna, how is that power divided between what gets radiated as radio waves and what is lost as heat? • If we replace the actual radiating behavior of the antenna with a simple resistor in a circuit diagram, what property of that resistor are we trying to imitate? • Which option describes something that is directly tied to the antenna’s ability to radiate, rather than to its physical losses or coils?

✅ Before You Answer

• Identify which choice talks about equivalent resistance related to radiated power, not physical losses or coil resistance. • Eliminate any choice that only describes losses (heating or dissipation in metal or coils) rather than useful radiation. • Check which option matches how textbooks define radiation resistance in terms of an imaginary resistor that would account for all the power sent out as radio waves.