# EEG 816: Radiowave Propagation 2009

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1 Student Matriculation No: Name: EEG 816: Radiowave Propagation 2009 Dr A Ogunsola This exam consists of 5 problems. The total number of pages is 5, including the cover page. You have 2.5 hours to solve the problems.

4 4. Determine the phases of the received electric fields on each of those paths. 5. How can the total amplitude of the electric field received by the radar system be computed? Give one equation without developing the overall solution. Problem 4 A telecommunication system is being installed in Nigeria using satellite technology and the following data is given as the link budget: The uplink and downlink distances are r u = r d = km. The uplink and downlink frequencies are f u = 6.5 GHz and f d = 4.7 GHz. The diameters of the earth and satellite antennas are 17.5m and 0.7m with 60% aperture efficiencies. The earth antenna transmits power of P TE = 1.2 kw and the satellite transponder (the amplifier chain of the satellite) gain is G = 90 db. Note that the Boltzmannʼs constant k = J/K

5 a. Calculate the up and down free space losses b. Determine the gain of the antennas c. How much power in dbw is received at the earth ground station? The receiving satellite antenna is looking down at an earth temperature of 300 K and has a noisy receiver of effective noise temperature of 2700 K. The receiving earth antenna is looking up at a sky temperature of 50 K and uses a high-gain LNA amplifier of 80 K (feed line losses may be ignored). The bandwidth is 30 MHz. d. Calculate the system noise temperatures and system noise powers of the satellite and ground receivers (the connection lines are lossless). Give the values in dbw! e. For the calculation in d), give the Signal to Noise Ratio SNR = P N in db. Problem 5 UNILAG is considering installing a ground base communication system operating at 1.2 GHz. The initial design suggests one of the terminals would be located 145m inside a wooded area of the campus. As design consultant, you are required to advise the predicted foliage loss using the updated ITU model? Assume the antennas gains are each 3 db and the antennas are vertically polarized. In addition to the ground base communication system mentioned above, UNILAG is also considering installing a system with the following characteristics: f = 1.8GHz and d = 1km with 12m of trees in the LOS and vegetation present. As par of your design consultancy package, you are required to estimate the total predicted median path loss for this system (excluding antenna gains) using the Weissberger model and the ITU model.

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