TDT02: Transmission Line Equations

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  • Опубліковано 16 січ 2025

КОМЕНТАРІ • 85

  • @wussup331
    @wussup331 2 роки тому +10

    I watched these videos during my undergrad and still return to them after a PhD and working as an RF engineer. Simply awesome!

    • @MrInventer80
      @MrInventer80 2 роки тому

      where did you do your bachelors/masters just out of curiosity? I'm soon finishing my undergrad in EE and would like to specialize in RF.

    • @wussup331
      @wussup331 2 роки тому +4

      @@MrInventer80 In the UK. Undergrad in electronics at Loughborough & PhD at University of Glasgow. If you want to do anything in a PhD make sure its out of passion because its tough going and try to assess how it will help your career - whether you see your future in academia or industry. Be very careful, its not about who will accept you but more where is best for you and where you want to be post education. Supervisor "selection" is very important. Others may say different but that's my advice based on my experience with the process :) best of luck to you!

    • @wussup331
      @wussup331 2 роки тому +1

      I will say this, at least in the UK RF expertise is a rarity and there is a shortage of talent. If you do a PhD, strive to have a solid understanding of the fundamentals. Again, my two cents :)

  • @igorbecker6192
    @igorbecker6192 4 роки тому +13

    The world needs more professors like this

  • @robispurple
    @robispurple 8 років тому +28

    You sir, Greg Durgin, are a hero! My professor simply derived all this on our first day of class with no explanation of what all the different variables and constants were. Leaving the entire class just baffled and lost. I now have some ground to stand on and can ask the appropriate questions. God Bless.

  • @1macueliso
    @1macueliso 4 роки тому +1

    This man is incredible he makes this class interesting and easy to understand. Quite an outstanding teacher.

  • @pawezielonka7662
    @pawezielonka7662 4 роки тому +20

    It's amazing, you can explain expotential series with base of 0.5 if you take students perseverance as an example:
    TDT01 - 203 394 views,
    TDT02 - 94 311views,
    TDT03 - 43 274 views,
    TDT04 - 20 648 views,
    TDT05 - 9 040 views.

  • @fep265
    @fep265 12 років тому +1

    Dr.Durgin you have made my Signals Transmission course an enjoyable course. Thank you so much for posting such awesome videos.

  • @1996dgl
    @1996dgl 4 роки тому +1

    This is so helpful. Thank you for making these lectures available to the public

  • @yahya1badawi1
    @yahya1badawi1 12 років тому

    Dr. Durgin, frankly, ur likes make that world better, now, transmission lines is like a piece of cake at least for me, thanks and i hope u keep up the good work, many thanks for sharing ur brilliant experience and btw u've a nice presentation skills :)

  • @felixqi6659
    @felixqi6659 4 роки тому +1

    It's so good that you shared those videos with us , which really help me a lot

  • @MrKKChina
    @MrKKChina 12 років тому

    Dr. Durgin, I love the way you are teaching, Thanks.

  • @RoyAndrada
    @RoyAndrada 9 років тому +1

    I was also asking myself about that two Zs, although asked a bit late and got Dr Durgin a little spooked, i have to thank Bill at 16:33 for asking that question.
    Aside from that, this lecturer really makes EM very interesting. Thanks and congratulations professor.

  • @mountainmanws
    @mountainmanws 5 років тому

    I am working with technicians taking the transmission line semester at a local college. I directed them to buy Transient Signals on Transmission Lines and to view all these videos. Superb teaching.

  • @jinglebell471
    @jinglebell471 7 років тому +3

    Thanks for sharing your lecture with us! It really help with my self-learning.

  • @dalygav
    @dalygav 8 років тому

    I like the passion . it really shines through and you can tell you love what you do. you are very much in your element. RF was one of my favorite subjects in school.bring on the Smith charts!

  • @cowpacino
    @cowpacino 7 років тому

    These lectures are going to save my ass this quarter! Great job!

  • @ibrahimkayikci2146
    @ibrahimkayikci2146 6 років тому +25

    "If you can't explain a subject in a simple way, it means you still don't fully understand it" - Einstein

  • @angelobruch
    @angelobruch 4 роки тому

    You are a hero, thanks from Brazil

  • @nilotpalbose1438
    @nilotpalbose1438 10 місяців тому

    Thank you so much dear professor. I had a lot of confusions about TL theory. But after watching the video, my understanding is clear I believe.

  • @chehar
    @chehar 9 років тому

    Greg Durgin, you are the man.

  • @runeinglev2782
    @runeinglev2782 10 років тому +34

    Teaching Level:
    It's over NINE THOUSAND !!!!!!!

  • @andywander
    @andywander 9 років тому +9

    Man, where were you when I was studying EE?
    Thanks!

  • @FranVarVar
    @FranVarVar 10 років тому +2

    Someone correct me if I am wrong but on 43:05 Greg says that controlling the geometry of the material (coaxial cable) one can design for a target velocity of propagation and a target impedance. I think that is true only for the intrinsic impedance but not for the velocity of propagation. Greg said a little earlier that the geometry cancel out when calculating the velocity.
    So the only way of design for a target velocity of propagation would be to play with the permitivity and permeability of the dialectric. I am right?

    • @0sk4rb
      @0sk4rb 10 років тому

      In the lossless case, the propagation speed will only depend on the permittivity and permeability (whereas the relative permeability in a dielectric is approximately equal to one).

  • @prekshaa96
    @prekshaa96 8 років тому +1

    awesome lecture sir

  • @mhmodsaid1022
    @mhmodsaid1022 6 років тому

    Thanks, Thanks, Thanks, Thanks, Thanks, Thanks forever 💙💙

  • @wty1992
    @wty1992 4 роки тому +2

    12:35 can anyone explain intuitively why is there a negative sign?

    • @chats-bug
      @chats-bug 3 роки тому

      It represents the direction of the current.

  • @ozzyfromspace
    @ozzyfromspace 5 років тому

    I didn't realize I needed the story at 30:00 until I heard it 😂🙌🏽🕺🏽🔥

  • @nikshepbangera5416
    @nikshepbangera5416 6 років тому +5

    does he do the derivations of the equations at 2:46 i dint see it in the first part of the video

    • @ozzyfromspace
      @ozzyfromspace 5 років тому +1

      he'll do them in future lectures

  • @jacobvandijk6525
    @jacobvandijk6525 10 місяців тому +1

    @ 17:32 It is only lossless because he assumes that R = G = 0. Why he does not tell this I don't know.

  • @abuabdullah9878
    @abuabdullah9878 3 роки тому

    Thank you so much.

  • @danseluk5193
    @danseluk5193 8 років тому +1

    Excellent!

  • @Raphael_NYC
    @Raphael_NYC 7 років тому

    Thank you Dr. D. Wonderful, generous, interesting. raphael santore

  • @zz9758
    @zz9758 6 років тому

    Thanks! Doctor. Could you tell us what book you are using?

  • @mattdistad
    @mattdistad 12 років тому +2

    I think I'll email my teacher and tell him to act more like this guy

  • @sonychayadi7754
    @sonychayadi7754 12 років тому

    I see so is there any influence with the impedance directly?

  • @GabiMartin97
    @GabiMartin97 4 роки тому

    Thank you!

  • @andreahudson3496
    @andreahudson3496 5 років тому

    Is this for lossless lines?

  • @Marva123
    @Marva123 7 років тому

    This lesson was explained in easy to understand terms compared to my obtuse class in EMAG 1 at my school.

  • @zonghengpu2235
    @zonghengpu2235 11 років тому +1

    wish i could go to GT for my graduate school, thanks a lot

  • @sonychayadi7754
    @sonychayadi7754 12 років тому

    my lecturer ask me to learn the transmission line by myself, and i find this video! Thx u sir! I really appreciate this video! xD
    but I have a question, how about the thickness of the transmission line? Is there any influence?

  • @youcefyahiaoui1465
    @youcefyahiaoui1465 8 років тому

    It seems like there needs to be 1/(2pi) left out in the last formula for microstrip Zo when a>b.

  • @gauravpoudel7288
    @gauravpoudel7288 7 років тому

    16:44 Is that guy in the class?

  • @PauloConstantino167
    @PauloConstantino167 7 років тому

    Greg, is voltage actually charge travelling or is it electric fields?

    • @nejcdezelak6358
      @nejcdezelak6358 7 років тому

      Voltage is a property of an electric field (it is equal to the energy that could be transmitted to a point charge if it would travel from point A to point B in the electric field). Electric fields on the other hand are caused by electric charges. So both things are interconnected.

  • @Mr.M1STER
    @Mr.M1STER 4 роки тому +1

    Lecturer: "Oh it's so beautiful isn't it"
    Class: *complete silence*

  • @tag_of_frank
    @tag_of_frank 8 років тому

    Where can I find homework questions and answers?

    • @MarcelloZucchi91
      @MarcelloZucchi91 8 років тому +1

      Look here www.propagation.gatech.edu/ECE3025/index.html

  • @NBSuperb
    @NBSuperb 6 років тому

    Is this distributive analysis or lumped?

  • @ashrefd
    @ashrefd 9 років тому

    Thanks

  • @fiapop
    @fiapop 12 років тому

    Thickness of the medium has effect on amount of current it can carry.

  • @Dhoyos7
    @Dhoyos7 11 років тому +1

    So in theory you could tap into the coaxial cable by placing a probe between the center wire and the outer shell.. Cant imagine it would be easy but it should work...

  • @tristandeppe5215
    @tristandeppe5215 4 роки тому

    42:01 and 55:20 Maryland accent!

  • @tellmebaby183
    @tellmebaby183 11 років тому +1

    u are awesome man

  • @austinmw89
    @austinmw89 9 років тому +1

    Why can't you be my EM teacher ;(

  • @noahballou6350
    @noahballou6350 4 роки тому

    i wish i was a Super-Cool 7th-Level Wavemaster like Professor Durgin

  • @carcheta21
    @carcheta21 11 років тому

    this guy is a f%^& beast!

  • @cmuller1441
    @cmuller1441 7 років тому

    The only point I don't like is using z as position variable. That could confuse people with zo (impedance)

  • @MrSomeSkeptic
    @MrSomeSkeptic 11 років тому

    38:51 Cough, touch cable with hand you coughed in, pass around the cable. :) Nice lecture so he gets away with it.

    • @diansong1394
      @diansong1394 3 роки тому

      and particularly disturbing after going through 2020

  • @YJake7
    @YJake7 11 років тому

    Oh how I got lost so quickly. Not your fault, I'm just only 15, guess I better go learn calculus

  • @ArpitChoudhary16
    @ArpitChoudhary16 10 років тому +1

    Hello sir, I need your urgent help. Can you please solve a couple of questions of Transmission Lines, for me in which i am facing difficulty? It would be very helpful, Sir. Will really appreciate your help and support. Thanks & Regards, Arpit

    • @pythonanimalia
      @pythonanimalia 10 років тому

      post your question please

    • @ArpitChoudhary16
      @ArpitChoudhary16 10 років тому

      python animalia Can I please have your email address? Accordingly, I can email you the questions. Thanks.

    • @pythonanimalia
      @pythonanimalia 10 років тому

      I would suggest you to put up your question in the comment section itself so that everybody gets chance to answer. m no pro in transmission lines.but still here it is :)python00078@gmail.com.

    • @ArpitChoudhary16
      @ArpitChoudhary16 10 років тому +1

      python animalia Thank you for your reply. Actually, it's a pdf file (and I can convert it to jpeg, doc, etc.) so cant upload it as a comment. Will email you shortly. Thanks:-)

    • @pythonanimalia
      @pythonanimalia 10 років тому +1

      okay...let's see if i can help with it:)

  • @DavidHinkes
    @DavidHinkes Рік тому

    Smoke -> Fire, V -> I

  • @TheBigBangggggg
    @TheBigBangggggg 5 років тому

    Of course, (t - z/v) * 2pi . f = (w.t - k.x)

  • @linbunte4310
    @linbunte4310 5 років тому

    imagine if you had a female disseminating purely technical information and they interrupted themselves to explain their adventures in greek rush week, or their initial disinterest in an engineering career until their buddy was there, or gave you some unrequested encouragement in the form of promises of how you will someday earn money, imagine the eye rolls

  • @bigfoottoo2841
    @bigfoottoo2841 3 роки тому

    You can't spell Geek without a double E. 🤣