EEC 220 Antenna and Propagation Exam 2022

About this paper

EEC 220: A 2-page Second-Semester Examination for Antenna and Propagation (EEC220), University of Buea College of Technology, instructors Wontchui/Ebude, 17/06/2022, 2 hours, credit 4. Question 1 (24 marks): definitions (antenna, polarisation, ionisation, recombination, skip distance, radio horizon), three functions of an antenna, and the modes of EM wave propagation (ground, sky, space wave). Question 2 (20 marks): a 10-item MCQ on ionospheric layers, critical/maximum-usable frequency, VHF range, resonant vs non-resonant antennas, Yagi-Uda reflectors, log-periodic antennas, and power gain in dB. Question 3 (8 marks): radiation resistance/radiated power/efficiency for a given antenna (effective height, rms current, total resistance). Question 4 (8 marks): rhombic antenna design parameters (tilt angle, leg length, height, termination resistance) for a given frequency and elevation angle. Question 5 (10 marks): radio horizon and maximum space-wave range calculations for given transmitting/receiving antenna heights.