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A ferrite rod antenna has 22 wire turns wound on a ferrite core with μ_{eff} = 38 and diameter 1:17 cm. Evaluate the effective length (maximum) using the expression in Prob. 4.2-1a at 1 MHz.
Problem 4.2-1
Vector effective length of a small loop antenna (a) Derive the following vector effective length expression starting with (3-49).
for a small loop antenna oriented in the xy-plane with N turns, effective relative permeability μ_{eff}, and area S of a single turn. (b) Find an expression for the ratio of the effective length of a small loop antenna to that for a short dipole antenna. (c) Evaluate the expression in (b) for the case of a single-turn loop of 0:3 m in diameter and a short dipole 0:3 m in length, both operating at 1:5 MHz. Comment on the results.
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