Chapter 11: Problem 4
Small antennas have low efficiencies (as will be seen in Chapter 14 ), and the efficiency increases with size up to the point at which a critical dimension of the antenna is an appreciable fraction of a wavelength, say \(\lambda / 8 .(a) \mathrm{An}\) antenna that is \(12 \mathrm{~cm}\) long is operated in air at \(1 \mathrm{MHz}\). What fraction of a wavelength long is it? \((b)\) The same antenna is embedded in a ferrite material for which \(\epsilon_{r}=20\) and \(\mu_{r}=2,000\). What fraction of a wavelength is it now?
Short Answer
Step by step solution
Key Concepts
These are the key concepts you need to understand to accurately answer the question.