Editing Characteristic impedance (section)

===Sources===
{{refbegin}}
*{{cite book
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 | year = 1977
 | title = Electrical Power Systems
 | isbn = 0-08-021729-X
}}
*{{cite book
 | last = Pozar | first = D.M. | author-link = David M. Pozar
 | date = February 2004
 | title = Microwave Engineering
 | edition = 3rd
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}}
*{{cite book
 | last = Ulaby | first = F.T.
 | year = 2004
 | title = Fundamentals of Applied Electromagnetics
 | edition = media
 | publisher = Prentice Hall
 | isbn = 0-13-185089-X
}}
*{{cite book | first1 = S. N. | last1 = Singh | date = 23 June 2008 | title = Electric Power Generation: Transmission and Distribution | edition = 2 | publisher = PHI Learning Pvt. Ltd. | pages = 212 | isbn = 9788120335608 | oclc = 1223330325 | url = https://books.google.com/books?id=dBtbDYdRsdkC&pg=PA212}}
{{refend}}