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Unformatted text preview: In figure b. the antenna is not matched to the line so a calculation for the current yields mA 122 73 25 12 R R V I rad s s s = + = + = The radiated power then is calculated as ( ) ( ) mW 547 73 mA 122 2 1 R I 2 1 P 2 rad 2 s = = = In figure c. the antenna is matched to the line so the current calculation now yields mA 240 25 25 12 Z R V I in s s s = + = + = and the power is ( ) ( ) W 1 . 2 73 mA 240 2 1 P 2 = = This represents quite an improvement in efficiency simply because we matched the load to the line. = 73 rad R V 12 s V = = 25 R s = 485 . d = 25 R s a. V 12 s V = s I = 73 rad R b. = 25 R s V 12 s V = s I Impedance matching network = = 25 s Z in Z c....
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 Fall '10
 Czarnecki
 Impedance

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