Small antennas have low efficiencies (as will be seen in Chapter 14), and the efficiency increases with

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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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Engineering Electromagnetics

ISBN: 978-0073380667

8th edition

Authors: William H. Hayt, John A.Buck

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Question Posted: Sep 26, 2018 10:46 AM

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Small antennas have low efficiencies (as will be seen in Chapter 14), and the efficiency increases with

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Engineering Electromagnetics

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