Page 570 - Engineering Electromagnetics, 8th Edition
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552 ENGINEERING ELECTROMAGNETICS
radiates 100 watts, how much power is dissipated by a matched load at the
receiving antenna? (b) Suppose the receiving antenna is rotated by 45 ◦
while the two antennas remain in the same plane. What is the received
power in this case?
14.30 A half-wave dipole antenna is known to have a maximum effective area,
given as A max .(a) Write the maximum directivity of this antenna in terms of
A max and wavelength λ.(b) Express the current amplitude, I 0 , needed to
radiate total power, P r ,in terms of P r , A max , and λ.(c)At what values of θ
and φ will the antenna effective area be equal to A max ?
