Lecture 4: transmission lines and capacitors Page: 8 of 41
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TRANSMISS:ON L1::ES AND PULSE FORMING NETWORKS
The topic of this lecture is pulse forming networks. The first
ite of discussion will be transmission lines because they are so preva-
lent, even if only in the form of coaxial cable. Fran there the subject
will proceed to pulse-forming networks: the practical problems encoun-
tered with then, their advantages, and disadvantages. Capacitors will
be our final topic, as they are the limiting factor in lumped transmis-
I have referenced two masters theses, and there is a bibliography
available from Texas Tech University.l,2 These present a good descrip-
tion of the transmission-line theory and more detail than I can present
in the limited space here.
Fig. 1 shcws the most familiar type of transmission line - coaxial
cable. By notation, there is an inner radius A and an outer radius B
(which is actually the outer radius of the inner conductor and the inner
radius of the outer conductor and the inner radius of the outer conduct-
or). This is an important point in that surfaces nearest each other
are used because high-frequency currents flow near the surface.
Formulas for caoacitance and inductance of coaxial transmission
27re a 5.56x10le E
_ " r a n a
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Butcher, R.R. Lecture 4: transmission lines and capacitors, report, January 1, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1060905/m1/8/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.