Misr University for Science and Technology
Faculty of Engineering
Department of Electronic & Communications
Satellite Communication ECE 592N Fall/2023-2024
Dr. Mohamed Hussein
Dr. Hesham Abdelhakim
Eng. Mohamed Morgan
Sheet 4
Q1. For a satellite transmission path, the angle of elevation of the earth station antenna
is 35°, and the earth station is situated at mean sea level. The signal is vertically
polarized at a frequency of 15 GHz. The rain height is 1 km, and a rain rate of 10 mm/h
is exceeded for 0.001 percent of the year. Calculate the rain attenuation under these
conditions.
Q2. Compare the specific attenuations for vertical and horizontal polarization at a
frequency of 4 GHz and a point rain rate of 8 mm/h which is exceeded for 0.01 percent
of the year.
Q3. Given that for a satellite transmission El =22°, R0.01=15 mm/h, h0 = 600 m, hR
=1500 m, and horizontal polarization is used, calculate the rain attenuation for a signal
frequency of 12GHz.
Q4. A circularly polarized wave at a frequency of 12 GHz is transmitted from a
satellite. The point rain rate for the region is R0.01 = 13 mm/h. Calculate the specific
attenuation.
Q5. Calculate the approximate value of atmospheric attenuation for a satellite
transmission at 14 GHz, for which the angle of elevation of the earth-station antenna is
15°.
Q6. Calculate the approximate value of atmospheric attenuation for a satellite
transmission at 6 GHz, for which the angle of elevation of the earth-station antenna is
30°
Q7. Calculate the gain in decibels and the effective area of a 30-m parabolic antenna at
a frequency of 4 GHz.
1
Misr University for Science and Technology
Faculty of Engineering
Department of Electronic & Communications
Satellite Communication ECE 592N Fall/2023-2024
Dr. Mohamed Hussein
Dr. Hesham Abdelhakim
Eng. Mohamed Morgan
Q8. The EIRP from a satellite is 49.4 dBW. Calculate:
(a) the power density at a ground station for which the range is 40,000 km and
(b) the power delivered to a matched load at the ground station receiver if the antenna
gain is 50 dB. The downlink frequency is 4 GHz.
Q9. Calculate the free-space loss as a power ratio and in decibels for transmission at
frequencies of (a) 4 GHz, (b) 6 GHz, (c) 12 GHz, and (d) 14 GHz; the range being
42,000 km.
