UNIVERSIDAD NACIONAL ABIERTA Y A DISTANCIA COLOMBIA FACULTAD DE INGENIERÍA 2018
1. Explain the practical application of the loss tangent with an example. 2. What kind of information give us the propagation velocity in electromagnetic waves propagation? 3. Explain how an electromagnetic wave behaves in free space, perfect dielectrics and good conductors. 4. Using the electromagnetic spectrum, explain the practical application of every type of radiation. 5. What is the refraction index and what kind of information give us about the electromagnetic waves behavior? 6. 7. What is a plane wave and a non-plane wave and where are they used? What is a magnetic and a nonmagnetic medium and where are they used? Why do we use plane waves to explain practical models associated to electromagnetic phenomenon?
Choose one of the following problems, solve it and share the solution in the forum. Perform a critical analysis on the group members’ contributions and reply this in the forum.
1. A dissipative medium has the following parameters: = 6, = 1.25 and = 1.5 /
Fin the wavelength and the amount of wavelengths that will penetrate a 9.6MHz signal.
2. In a medium with the following characteristics, = 4, = 1.6 and = 2.310− / find these parameters for a 90MHz signal: a. Loss tangent. b. Propagation constant. c. Phase velocity. d. Wavelength.
e. Index of refraction. Explain the meaning of each found value.
3. An open medium has the following electromagnetic characteristics = 9, = 1.6 and = 1.210− / Find the power transmitted by a 300MHz signal with a maximum electric field of 200V/m and find the skin depth of the signal.
4. For a medium with the same electromagnetic characteristics than the third problem, find the losses per length unit for a 500MHz signal. If the original signal has an electric field of 120Vrms/m. Find the losses in watts when the signal travels 10m in the medium. 5. For a 2.5GHz signal, traveling in seawater find the attenuation per length unit. How long does the signal have to travel, in order to have an attenuation greater than 3dB?
