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Unformatted text preview: ECE 450 Homework 6 Due: Tue, Oct 6, 2009, 5 PM 1. A linear antenna array of length of 4.65 m is radiating in air. The operating frequency is 1 GHz. Assume that all antenna elements are identical and that their driving currents are of the same magni tude and in phase. The radiation field of the array is being monitored at a distance of 1 km from the array in the direction of broadside radiation from the array. If the maximum allowable phase error in the quantitative analysis of the radiated field is / 16 , calculate the maximum distance away from the broadside that a planewave approximation of the radiation field would be acceptable. 2. A timeharmonic uniform plane wave is propagating in a medium or magnetic permeability that of free space and electric permittivity 4 . The operating frequency is 100 MHz and the phasor of the electric field vector at the origin of the reference coordinate system is E (0 , , 0) = z 10 V/m. The direction of propagation of the wave is k = x 2 2 y 2 2 ....
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This note was uploaded on 02/22/2010 for the course ECE 450 taught by Professor Franke during the Fall '09 term at University of Illinois at Urbana–Champaign.
 Fall '09
 FRANKE
 Frequency

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