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# 450fall09hw6 - ECE 450 Homework 6 Due Tue Oct 6 2009 5 PM 1...

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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 π/ 16 , calculate the maximum distance away from the broadside that a plane-wave approximation of the radiation field would be acceptable. 2. A time-harmonic uniform plane wave is propagating in a medium or magnetic permeability that of free space and electric permittivity 4 ε . 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) = ˆ z 10 V/m. The direction of propagation of the wave is ˆ k = ˆ x √ 2 2- ˆ y √ 2 2 ....
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450fall09hw6 - ECE 450 Homework 6 Due Tue Oct 6 2009 5 PM 1...

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