A car antenna is a vertical monopole over a conducting surface. Repeat Problem 1 for a 1-m-long car antenna operating at 1 MHz. The antenna wire is made of aluminum with μc = μ0 and σc = 3.5 × 107 S/m, and its diameter is 1 cm.
Problem 1
A 2-m-long center-fed dipole antenna operates in the AM broadcast band at 1 MHz. The dipole is made of copper wire with a radius of 1 mm.
(a) Determine the radiation efficiency of the antenna.
(b) What is the antenna gain in decibels?
(c) What antenna current is required so that the antenna will radiate 20 W, and how much power will the generator have to supply to the antenna?
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