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Unformatted text preview: Assignment #4 1. A 2.4-GHz wave propagates in a medium characterized by r = 1.6, r = 20, and = 2.5 S/m. The electric field intensity in the region is given by E= 0.1 cos( t- z) a z e x V/m . Determine the attenuation constant, the propagation constant, the intrinsic impedance, the phase velocity, and the wavelength of the wave. Obtain an expression for H (z,t) . Find the average power density in the medium. 2.An airplane wants to communicate with a submarine using 10 MHz transmitter. Transmitted uniform plane wave travels downward in +z direction and produced a magnetic field at the ocean surface (z=0) which is given as follows: H (z=0,t)=300cos(2 t) a 7 10 y mA/m. a. Express the magnetic field intensity in the ocean. b. If the submarine requires at least 3 mA/m (peak value) for reliable communication, how deep it can go with out losing the link. c. How deep it can go if the transmitter frequency is switch to 10 kHz....
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- Spring '10