Answer Happy

a 3. (a) A plane wave with a frequency of 5 GHz is propagating in a medium with 8, = 2.56, 3. = 1 and 0. Find: the wave impedance, the phase velocity, the wavelength and the phase constant (Specify these quantities with their corresponding units) [4 marks) If the medium is not a perfect insulator, but has a conductivity of a =0.01 Sm', what is the percent variation of the phase velocity and the phase constant? Indicate values with their sign. [2 marks] (W) the medium is an imperfect conductor, with a = 3255 Sm'. calculate the propagation constant, the skin depth, the phase velocity and the intrinsic impedance. (Specify these quantities with their corresponding units) marks] () in the case () above, how far inside this medium the wave has to travel for the intensity (amplitude of the field) to attenuate to 10% of the original magnitude? [2 marks] (b) A plane wine travelling in air is reflected under normal incidence by the interface with a dielectric medium of dielectric constant & A standing wave ratio of S=1.6 can be measured in the air region. What is the dielectric constant (relative permittivity) of the dielectric medium? (4 marks) 415