Newbie question lambda g
  • Sw2244
    0
    Hi, im totally new to uw, but have a 4th Ed book by Pozar and am slowly plowing through it. I have an Elec Eng degree but been out if it for years doing IT, so Im learning a lot of this from scratch as a hobby.

    My question is with a WR430 waveguide, for calculating where 1/4 wavelength locations should be along the waveguide - should i use the free air wavelength, or use the lamdba g ( waveguide wavelength)?
    Sw2244 Options
  • UnknownEditor
    4
    I believe you should use lambda guide, as described here

    https://www.microwaves101.com/encyclopedias/waveguide-mathematics

    But I would hold out for a second opinion!

    Steve
    UnknownEditor Options
  • teleko7
    0
    Hi
    Agreeing with the previous answer and from what I've learned, I would say wavelength in a waveguide is modified with regards to the wavelength in an unbounded medium by the m and n indexes of the mode that you consider, as the propagating wave is not a perfect plane wave unless you go very high in frequency...

    You can also check your Pozar(MWEng, 4ed. p112), Balanis(Adv.Eng.Electromags,1ed. p354) or Ramo (Fields&Waves in CommElectr, 3ed. p418) or go to the classics: Marcuvitz (WaveguideHandbook, Ch1)

    Hope this helps.

    Regards

    Iban
    teleko7 Options
  • Antonio
    0
    Also, from Feynman lectures, which are very easy to read through, you can see it´s in line with Microwaves101: see formula (24.19), you can find the lecture on this link http://www.feynmanlectures.caltech.edu/II_24.html
    Antonio Options
  • Aparna Bhuvanagiri
    0
    You need to use lambda g which is the wave length inside the wave guide for a particular frequency
    Aparna Bhuvanagiri Options
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