🔍 Key Concepts

• Hertzian dipole (short antenna) behavior and relationship between length and wavelength • How resonance in an antenna depends on it being a certain fraction of the wavelength (e.g., 1/2λ, 1/4λ)** • What happens to the resonant frequency if the physical size of the antenna becomes shorter compared to the wavelength

💭 Think About

• If an antenna is shortened but you keep the same operating frequency, how does that affect its relation to the wavelength? Is it now closer to, or farther from, its ideal resonant length? • For a fixed physical antenna length, what happens to the resonant frequency when the wavelength gets shorter or longer? • Which choices are talking about resonant frequency versus unrelated effects like saturation, traps, and cross-modulation?

✅ Before You Answer

• Be sure you understand that frequency and wavelength are inversely related (as one goes up, the other goes down). • Confirm that antenna resonance occurs when the antenna length is close to a simple fraction of the wavelength. • Eliminate any options that do not directly describe a simple, primary effect of changing antenna length on its resonant frequency, but instead describe more complex or secondary RF effects.