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713ps1 - PROBLEM SET 1 ECE 713 Spring Quarter 2006 Assigned...

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PROBLEM SET 1 ECE 713 Spring Quarter 2006 Assigned: March 27th Quiz: April 7th in class Instructor: Joel Johnson Problem 1 For each of the following scenarios, describe which propagation mechanism would usually be the dominant mechanism, and briefly discuss which secondary effects (if any) may be important in some cases. Dominant mechanism possibilities are direct transmission, direct + Earth reflec- tions, groundwave, terrain diffraction, and ionospheric reflection. Secondary effects are the domi- nant mechanisms plus tropospheric refraction, atmospheric attenuation, and ducting. (a) An L-band radar system (1 GHz) tracks a low flying object over the ocean. (b) A Ka-band (35 GHz) Earth station communicates with a satellite directly overhead. (c) A listener uses his AM radio to receive WTVN (610 KHz) at night. (d) Radio Free Europe transmits at 25 MHz. (e) An FM radio station transmits at 100 MHz to listeners located in their cars. Problem 2 Classify the following material types as (i) homogeneous/inhomogeneous, (ii) time variant/
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