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ECE604 Homework 10 Out: Tuesday, March 30, 2004 (Session 21)
Due: Tuesday, April 6 (Session 23)
[Students with tape delays: due according to session number] Notes:
0 Midterm exam #2 will be held in class Thursday, April 8 (Session #24). The exam will
cover chapters 3, 5, and 6.
0 You may bring a onesided 8 1/2” X 11” formula sheet (one page only) to the exam. An
additional formula sheet will be supplied and made available prior to the exam.
0 No calculators, no PDA, etc. at exam.
0 Due to travel obligations, lecture for Tuesday, April 6, 2004 (session #23) will be pre
taped.
0 Prof. Weiner will not be available for office hours on Wednesday, April 7 and Thursday,
April 8.
o The TA, Dennis Lin, will hold expanded office hours the week of the exam. His office
hours will be:
Tue 3:004:30 pm
Wed 2:304:00 pm
Thu 3:004:30 pm Problem numbers are from the text by Ramo, Whinnery and Van Duzer (3rd. edition, 1994). 1. Review Problem
Consider a parallel—plate transmission line made of perfectly conducting plates. The plates are 1 mm wide and are spaced by 50 um. The plates are separated by an insulator
with relative dielectric constant St = 9. Assume u = Mo. The transmission line has
characteristic impedance Z0 2 6.39 . Assume the transmission line is driven at one end by a sinusoidal voltage source. At the other end a load resistor R = 2582 is connected.
The transmission line is 10 cm long. perfectly conducting plates
' (1.;mnWide) For what range of frequencies (work out approximate numbers!) can the transmission
line and resistor combination be modeled as a (frequencyindependent) lumped circuit
equivalent? Draw the equivalent circuit for this frequency range, and explain your
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 Spring '08
 Staff
 Electromagnet, Weekday names, Permittivity, Electrical impedance, Transmission line, Dielectric

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