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Homework Help: Parallel Plate Wave Guide

  1. Mar 8, 2016 #1
    Hi, I'm working on a parallel plate wave guide for wave propagation and had a question about it. Here's a quick diagram:

    Capture.PNG

    While analyzing an EM field polarized in the y-direction, the modal impedance of the TEn mode comes out to be:

    Capture.PNG

    Why is that negative sign there? If someone could just explain where that negative sign comes from I'd appreciate it greatly. Does it have to do with the reflection coefficient?
     
  2. jcsd
  3. Mar 8, 2016 #2

    ehild

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    Homework Helper

    You have to go back to Maxwell's equations to get the relation between components of the electric and magnetic fields. In order to get the wave impedance positive the minus sign has to be used.
     
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