# 329fall09hw9 - ECE 329 Homework 9 Due THURSDAY 5 PM 1 A...

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Unformatted text preview: ECE 329 Homework 9 Due: THURSDAY, October 29, 2009, 5 PM 1. A submarine submerged in the ocean (where σ = 4 S/m, r = 81 , and μ r = 1 ) wants to receive an electromagnetic signal from a ship located directly above it at the surface. If the ship is transmitting at 20 kHz, how close must the submarine be located in order to receive at least 0.1% of the transmitted signal amplitude? 2. In conducting media, plane TEM wave parameters γ and η satisfy γη = jωμ and γ η = σ + jω as well as μ = γη jω σ = Re { γ η } = 1 ω Im { γ η } Use these relations to derive material and wave parameters for the following plane wave propagating in a non-magnetic material ( μ = μ ): H = ˆ x 10 e- y cos(8 π × 10 6 t- √ 3 y- π 3 ) A/m Determine: a) The propagation constant γ and intrinsic impedance η b) The permittivity and conductivity σ c) Phasor ˜ H d) The corresponding phasor ˜ E e) The time averaged Poynting vector < E × H > f) The time averaged power dissipated in a cubic volume bounded by the planes...
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329fall09hw9 - ECE 329 Homework 9 Due THURSDAY 5 PM 1 A...

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