The picture below shows the ABCD parameters for a transmission line of length \$l\$ from this video.

Question: What does \$\beta\$ represent?

ABCD Parameters of a transmission line


1 Answer 1


Beta is the phase constant, the change in phase per unit length.

  • \$\begingroup\$ Is that the same as \$\frac{1}{\lambda}\$? If not, how does it relate to wavelength? \$\endgroup\$
    – KJ7LNW
    May 28 at 23:40
  • 2
    \$\begingroup\$ I believe it is 2 Pi over lambda. On my phone at the moment, I can give more detail when I get to my desktop. \$\endgroup\$
    – GodJihyo
    May 28 at 23:50
  • \$\begingroup\$ Now that I know what it was called I was able to search and find that it is, indeed you are correct: \$\beta = \frac{2\pi}{\lambda}\$, \$\lambda=\frac{2\pi}{\beta}\$: en.wikipedia.org/wiki/Propagation_constant#Definition . Thanks! \$\endgroup\$
    – KJ7LNW
    May 29 at 0:37

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