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 8 (a) An antenna that is 12 cm long is operated in air at 1 MHz What fraction of a wavelength long is it (b) The same antenna is embedded in a ferrite material for which r 20 and r 2, 000 What fraction of a wavelength is it now

Question: 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

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 λ/8.

(a) An antenna that is 12 cm long is operated in air at 1 MHz. What fraction of a wavelength long is it?

(b) The same antenna is embedded in a ferrite material for which ∈_r = 20 and μ_r = 2, 000. What fraction of a wavelength is it now?

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