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Greg Durgin
Registrace 22. 08. 2009
Prof. Durgin Lecture Videos. I have two courses of material online, ECE 3025 Electromagnetics and ECE 6390 Satellite Communications. For notes, sample problems, and supplemental info on Electromagnetics, see the companion page at propagation.ece.gatech.edu/ECE3025/opencourse/oc.html.
SSP: The Space Solar Power Demo We Need
This is an encore lecture based on a presentation at the Space Solar Power Workshop in Aveiro, Portugal (held as part of IEEE WiSEE 2023). This lecture explains why there has been a surge of recent demonstrators for Space Solar Power. We gage how close to a viable SSP system we actually are and provide a novel research path forward.
zhlédnutí: 288
Video
TDT11: Differential Transmission Lines
zhlédnutí 1,2KPřed rokem
Learn about differential transmission lines, their use in suppressing common mode interference and noise, and the difference between odd and even mode impedances.
AAA03: Introduction to Antenna Arrays
zhlédnutí 1,9KPřed 3 lety
An introduction to general array theory and the concept of an array factor. We present the array factor for a uniform linear array.
ANT11: Method of Moments/Numerical EM Code
zhlédnutí 2,5KPřed 3 lety
This is our first foray into numerical EM techniques for solving antennas. We discuss how the method of moments works for solving antenna currents.
ANT10: The Yagi-Uda Array
zhlédnutí 1,2KPřed 3 lety
Overview of the Yagi-Uda array, a popular directional antenna for VHF, UHF, and microwave engineering.
ANT09: Resonant Loop Antennas
zhlédnutí 983Před 3 lety
In this lecture, we discuss the properties of loop antennas that have increased size, with circumferences on the order of a wavelength.
ANT08: Electrically Small Loop Antennas
zhlédnutí 949Před 3 lety
Introduction to the behavior of electrically small loop antennas.
WAV08: Rician Fading
zhlédnutí 1,4KPřed 3 lety
A discussion of non-Rayleigh small-scale fading that happens in line-of-sight radio environments.
WAV07: Small-Scale Fading
zhlédnutí 450Před 3 lety
This video describes why multipath wave interference is so prevalent in terrestrial wireless links. We introduce the Rayleigh fading distribution to calculate outage probabilities in small-scale fading links.
POT07: Applications of Knife-Edge Diffraction
zhlédnutí 717Před 3 lety
In this video, we talk about the behavior of the knife-edge diffraction formulation and define "Fresnel Zones", leading to useful design rules for estimating diffraction losses between transmitters and receivers.
POT05: Fresnel Evaluation of Rectangular Aperture
zhlédnutí 528Před 3 lety
How do you mathematically describe the effect of a screen with a rectangular cut-out between an electromagnetic source and observation point? This is a key lecture in our construction of the knife-edge diffraction formula.
POT06: Knife Edge Diffraction
zhlédnutí 2KPřed 3 lety
In this lecture, we develop and describe one of the classical results from physics knife edge diffraction. The result illustrates how diffraction differs from Geometrical Optics.
WAV06: The Seidel-Rappaport Propagation Model
zhlédnutí 399Před 3 lety
This video explores how to predict radio coverage/signal strength using just a little bit of site-specific environmental data. We discuss how to optimize these models ... and adapt them to predict the stock market.
WAV05: Path Loss Exponent Model
zhlédnutí 2,7KPřed 3 lety
Review one of the basic ways to model signal strength between antennas in realistic environments.
POT02: Derivation of the Kirchhoff Helmholtz Integral Theorem (KHIT)
zhlédnutí 2,2KPřed 3 lety
In this video, we derive the basic form of the Kirchhoff Helmholtz Integral Theorem (KHIT) that is used to extrapolate field behavior into space.
GOT05: Ray Reflections from Curved Surfaces
zhlédnutí 225Před 3 lety
GOT05: Ray Reflections from Curved Surfaces
GOT04: Ray Tracing Applications and Techniques
zhlédnutí 588Před 4 lety
GOT04: Ray Tracing Applications and Techniques
ANT01: Current Standing Waves on Wire Antennas
zhlédnutí 1,4KPřed 4 lety
ANT01: Current Standing Waves on Wire Antennas
Great work 👌👏👍
Thank you
Thank you
If I'm not mistaken, the counter-propagating plane wave example you show around 31mins yields non-zero tangential magnetic fields on the surface S.... To go with the transmission line analogy: a shorted transmission line has no load voltage (electric field) but the current (magnetic field) doubles/is non-zero at the load. If that's correct then I believe the added standing wave field poses no threat to the uniqueness theorem, even if the media is lossless.... Maybe I'm wrong? 38:33
one good point of cassegrain is that a smaller dish stacked ontop of the bigger one! Voyager and other spacecraft have this configuration to be able to point the dish at earth and just switch from the biggest to the samller one if required!
Don't answer all at once 😂 I will use it Great work sir Greetings from north Africa desert (Algeria)
Watch his video just because of Sir Ashraf Iqbal ❤
#101,739 in the longest continuing series in all of education: Visual Studies of the Back of the Human Head, Writing on a Black or White Board Subspecialty.
This is probably the best video on SAWs on CZcams. Super clear and answered all my questions. Thanks a ton!
Dear Mr Durgin I have been retired a while now and I like to relearn lean all the things i never understood i did enjoy your Class. I professor of mine once said going to school is like asking for a drink of wather and they turn on a fire hose on you.
presentation: 100 over 100 recording skills: 100 over 100, with a minus sign in front.
@ 15:47 czcams.com/video/uBlnMIDKrtI/video.htmlsi=uMYC4AlMsCJNfu2B&t=36
@ 17:32 It is only lossless because he assumes that R = G = 0. Why he does not tell this I don't know.
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.
Very Insightful
Engineers waste their college experience on studying.
Maybe but they get to work some really cool things long before normal people can purchase. As an engineer you have to travel all over the world to work with other engineering teams. I have travel the world as an engineer.
As a learner of EM for years Prefessor is not good at only math but also give the idea behind the intuituve motivation and imagination of the wave eq. of. that is the quality. Thank you .
I like it
nothing better than cold, hard science... except when you combine it with edible thc...
Thank you professor Durgin! That was a wonderful lecture!
Shows
The Carrier to Noise Ratio is always in Decibels when calculating the Bit Error Rate for different M-Ary Phask shift keying?
thank you for the explanation of GPS. I think it hasn't changed much even since 2009
Professor Frodo
My Emag guy!
What is E and H
In 21:44 , in 'Fourier Optics' by J. Godman, they define a composite surface S + S', could you elaborate why that is the case and not S - S' like you did?
Great lecture Greg thank you for sharing. You seem like a really engaging profrssor - your students are lucky to have you!
thanks for sharing
In my opinion the greatest scientist that ever lived .
@anthonybardsley4985 Einstein's opinion ditto.
Maxwells equations are actually Heaviside equations.
This guy is a real geek! Just remember, you can't spell geek without a double E.
Exercise music is "El condor pasa", a famous song from Peru, where I'm from. Greetings from our country and excellent lecture, professor!
I'm 40 and learning. Thanks.
Dear Professor Greg. Thank you for uploading the lecture on Differential Signaling in the TDT course. It was much needed! However, I couldn't find the classroom notes on the website, and the book (Peterson & Durgin's synthesis lectures) don't cover it either. Could you suggest any other references for further reading? Thanks!
u need a comment
21:41 what material is he talking about I wonder 🤔
I wish these guys would state the description for each variable used. Like he shortly explained little z and big z when the student asked. That'll make it much easier for me to understand ehat the equation is telling me about the signal.
thanks for the great explaination. I have a question though, what should be the distance between the antenna elements?
Often the distance between the antenna elements is lambda/2
Beautiful. I've been looking for this. Thank you.
I used your first videos to learn about TDTL by myself to accelerate the reseaech i was doing and its great to see a mew video with such great educational content. Thank you.
He’s back!
... with some extra kilograms.
Thanks for continuing to share such valuable knowledge with the world Prof. Durgin! Looking forward to your next video!
👹 👺 👿 monster signals 🛡️ 🛡️ 🛡️ shielding 👼 👵 👶 weak signals
Smoke -> Fire, V -> I
THis is the best. I'm relearning the material my profs never explained properly. This is a bonus, you're making it fun and the quality is there in a simple way.
Interesting information. Thank you!
Electron is a wave. Which property of the wave contributes to the negative charge of electron
or if its a Human body....... lmao 15:30
When charged line is terminated with Zo_new instead open circuit which makes reflection co efficient zero so V- is zero and since V+ is 12V so the voltage across the Zo_new is 6V because of voltage divider. If we have to do the same using the general transmission line model with dependent sources I get 12V across the Zo_new because 2V- is still 24V because V- is looked at the other side of the transmission line which is yet to change after transit time. Need clarity on this Context - from 44:38 timelap