Why can't all modern day KZitem educational videos start with an epically uplifting orchestra?
@pfmcdermott1
Ай бұрын
Right!? I was suddenly really excited to learn! It helps that the video then delivers actual no BS Lear ing content, but the orchestra definitely got me ready to learn.
@jpvoodoo5522
8 күн бұрын
@@pfmcdermott1, Nowadays our instructional videos sound like oontz oontz oontz with no explanations.
@connormagill4201
Жыл бұрын
Thank you Royal Canadian Air Force for creating such an informative and aesthetically pleasing video. Coming from a US Marine decades later, this presentation helped me understand the fundamentals of wave propagation.
@DragonProtector174
2 ай бұрын
I didn't realize it was so simple to produce a radio wave. That explains why I see FFC sticker on almost everything. Electronic.
@danwest7898
2 жыл бұрын
In the mid-70's I used this as a training film (it was old, scratched 16mm celluloid film) when I was a USAF military adviser to the Imperial Iranian Air Force. Yes, Iran was an American ally at the time and the Shah was still on the Peacock Throne. So glad to find it online. For those who think this is crude compared to what you can create with today's technology, it was animated by hand, one frame at a time, just like Walt created Mickey in 1928.
@PinkeySuavo
5 ай бұрын
thank you, interesting information
@jvman23
3 ай бұрын
I have no idea how anyone could think this video is crude, it so eloquently describes such a complex operation.
@-Mark_F
2 күн бұрын
This video is really great! I like the way that they leave space and gives the viewer time so that the Info sinks in.
@thorn9717
3 жыл бұрын
For weeks I've been looking for a video describing WHY half wavelength is SOOOO important in every conductor carrying a varying current. All videos I could find described the standing wave you create at the half wavelength, but failed to describe WHY it radiates that specific frequency. This video does the simple and yet very effective way of doing just that! Thank you to the uploader of this video!
@itsmetheghost4993
11 ай бұрын
Another feature of square bus bars would be to generate less rf?
@artie5172
9 ай бұрын
I don't understand too? Can you explain
@andrewknotts2798
6 ай бұрын
@@artie5172 To make the most efficient and simplest use of an antenna of any length, you want to push and pull the electrons along the full length of the antenna. To do this you’ll be switching the voltage from high (to pull them) to low (to push) whenever the electrons reach the close end of the antenna to the voltage source, and from low to high when they reach the far end. If you waited for the electrons to do this you would have a wave length that is double the length of the antenna (while on the antenna you get the first magnetic peak in one direction but not the comeback peak with the reverse curl [negative sine wave] until the electrons are on their way back. You often want a shorter wavelength and can do this by switching from low to high voltage (push to pull) at 1/3 the length of the antenna and swithching back at 2/3rds so when the electrons reach the end you’re in the same position to switch from push to pull. You can actually add any arbitrary number of full wavelengths after you add the one half wavelength switch. So you could switch at 1/5 of 1/7 and add 2 or 3 full wavelengths after respectively. You’re still in the efficient position of going from push to pull when they finally reach the end of the antenna.
@sharkpowah
5 ай бұрын
the simple dipole (basic antenna) radiates at lambda/2 frequency since it's in half period of a sinusoid that you can see at least 1 "back and forth flow" of the electrons, therefore in half the period (half the wavelength) you can send a high quality signal
@ROBERTE1963
Ай бұрын
This explains why a half wave antenna is used instead of a full wave. Finally I have a basic simplified understanding.
@schitlipz
Жыл бұрын
Back when Canada was great. Greetings all Canadian avionics folks here. Bob, if you're still around, thanks for the start in the career.
@akashk961
2 жыл бұрын
❤😎 Love & Respect to the whole team for making this effort long-long back! It still helps
@VE9ASN
5 жыл бұрын
I can't stress enough how this video helped this all finally make sense, just awesome.
@russellsteadele6518
6 жыл бұрын
This is absolutely fantastic as a visualization!
@-danR
3 жыл бұрын
There's a far better, and even _older_ visualization at: "Radio Antenna Fundumentals Part 1 1947" , KZitem (Fundumentals*) Don't worry about the preliminary part. 16;28 will make the whole business of E and H field propagation crystal-clear, because of the particular visual viewpoint it gives. After seeing that, then I come back to the present video at 5:13 and can now see the point of view they are presenting. ________ *the youtuber's spelling, not the Air Force's
@johnwest7993
2 жыл бұрын
I spent a couple of weeks with headaches reading various textbooks about this until it all sunk in. This makes it perfectly clear in 12 minutes and 25 seconds, (with the exception of the voltage/current phase relationship of the radiated signal.) The only thing I should point out is something that I originally confused myself about from seeing all those sine waves. The field doesn't actually have the 'shape' of a sine wave. The sine only represents the intensity of the energy and its field polarity reversal. It actually physically 'looks' more like like fluctuating soundwave pressures, (if you can imagine them with 2 phases and a polarity reversal.) Recall that electromagnetic waves have wave/particle duality, so they can also be pictured as a stream of photons of fluctuating density. Good luck with that bit, but you get my point. :)
@marcv2648
Жыл бұрын
I think you're wrong about this. Heinrich Hertz showed in the 1880s that radio waves are indeed 2 dimensional waves (transverse waves). Yes this may seem weird when you are forming a mental picture, but it is demonstrably true, and antennas depend upon this 2D physicality. Sound waves are longitudinal waves. They are indeed 3 dimensional.
@PinkeySuavo
5 ай бұрын
Yeah I was ALWAYS confused with the sines regarding audio and em waves... The audio I understood by watching shockwaves. So I wanted to imagine EM waves the same. But I don't get this 90 degree between waves. I dont really understand these waves. I feel like I understand magnetic and electric field, but not a wave of them.
@JenkoRun
4 ай бұрын
"Recall that electromagnetic waves have wave/particle duality" That's an inherent contradiction.
@rtpfixit
Жыл бұрын
Perfectly straightforward and clear instructional video. Everything simply broken down to the basics and explained.
@RosssRoyce
7 ай бұрын
If it’s clear then why they do show current and voltage both weak at the tips of the antenna? One of these is strong at the tips, don’t you think?
@aliuyar8537
5 жыл бұрын
The narration level is good for 12 intelligent year old boy. What a success to inform public masses
@companymen42
5 жыл бұрын
I want a refund from my university. My instructor has his PhD in this and still couldn't explain it...
@owen7185
2 жыл бұрын
Sadly the tale of many universities today
@bran_rx
2 жыл бұрын
@@owen7185 facts... guy who taught me signals and systems is a fraud lmao
@owen7185
2 жыл бұрын
@@bran_rx I believe you 💯💯
@moodflix5053
2 жыл бұрын
🤣🤣
@youtubeaccount7544
Жыл бұрын
You’re the one dumb enough to go to “college” for an “education” hahah.
@gastongonzalez221
4 жыл бұрын
Wow, the polar diagram explanation starting at around 9:00 minutes blew my mind. Very clear explanation. Thank you.
@johnishikawa2200
2 жыл бұрын
Good explanation connecting the standing waves of current and voltage to the strength of the magnetic and electric fields that are produced by them, respectively. And an excellent description of how the radiation pattern is sketched by first measuring the field strengths at points away from the antenna.
@pharmapsychotic
6 ай бұрын
This video turned my life around.
@jonahansen
5 жыл бұрын
Deusdat - I just received an email where you explained the incongruence regarding the phase of the electric and magnetic field, but it doesn't appear here. But it really does explain it - great thinking, thank you so much. I should have tried to think it through myself - but it needs to be here, so I'm going to copy and paste it from my email: Deusdat replied: My explanation: In fact, the accumulation of electrons at one end of the dipole is caused by the external voltage applied by an electronic amplifier. So it's this electric field that causes the crowding of the electrons, not the opposite. The current produced by these electrons is maximum at the beginning of their flow - and so is the magnetic field! Gradually the accumulation of electrons polarizes the dipole creating a secondary electric field that opposes the initial one. So there is a point when the total electric field is cancelled and the electron accumulation reaches its peak. The current is now zero - and the magnetic field is also zero. Conclusion: both fields are actually in phase, contrary to what is depicted in the video! The phase difference appears between the magnetic field and the polarization of the dipole (the secondary field), not the total electric field. Very well done, dude or dudette, as the case my be!
@deusdat
5 жыл бұрын
Thanks, I wish I understood other things too. Antennas are a tricky matter.
@purbeshmitra9704
5 жыл бұрын
That's a good explanation.
@russ_vee_jr4199
Жыл бұрын
I just learned more in 12 minutes than I have in the last 50 years. Bravo Canada...........
@renatobressan748
Ай бұрын
So did I.
@gustavgnoettgen
5 жыл бұрын
If you know about current and electromagnetism already, this is incredibly beautiful. Well made explanation what's going on!
@renatobressan748
Ай бұрын
Man, the very best explanation, in years. Now I understand. Thank you!!!!
@nebula1100
11 ай бұрын
This is so intuitive I’m CONVINCED my EE degree was a total scam.
@deusdat
5 жыл бұрын
Big flaw: when describing the dipole behavior, H and E are in time quadrature (H is max when E is zero). Later on, when describing the electromagnetic wave, suddenly E and H are in phase. This should have been explained...
@jonahansen
5 жыл бұрын
Very well said! This is the part that always confuses me, and prevents me from understanding antennas. I've yet to find a good explanation on KZitem. I get that the fields at the antenna are "near field", and the propagating part is "far field", the latter propagating energy independent of the device that launched it. But how does it go from space quadrature to space in-phase?
@MarcelloZucchi91
5 жыл бұрын
Good observation. The exposition in this video is clearly simplified. In the dipole behaviour, what is shown is only the reactive part of the field, which dominates in the vicinity of the antenna, being the dipole a resonant (reactive) structure. The energy of this field is stored near the antenna and does not propagate. Thus, E and H field are in quadrature. But there is also another contribution, the radiation field, which is smaller but propagates far from the antenna, in which the E and H fields are in phase. If you're familiar with AC circuits, that's exactly the same with voltage and current on a load.
@jonahansen
5 жыл бұрын
I had to add a separate comment since KZitem is messing up. See it above/below. Thanks - it is excellent...
@aryamanmishra154
5 жыл бұрын
I observed the same stuff
@alanmalcheski8882
5 жыл бұрын
watch it again. they say that the dipole antenna creates half a wave, not a full wavelength. It has only the peaks of the waves at each end, but it creates a whole wavelength, when it goes back and forth. The charge in the antenna is bouncing back and forth from right to left and each time it hits the end and bounces back, the wave conforms to the same wave pattern, bouncing energy in each direction equally, but the flow of the EMR is going in mainly only one direction... the radiation is not equal, as you see, it goes more to the right than left, because of the reflectors but also because of how it projects the signal into the air. The signal leaves the antenna as the charge in the dipole hits the end, or reflector, and because of the way the two wave vectors keep things spinning one way, the dipole continues to project the signal in that direction, just weaker as the electrons in it are going backward, in it. That's my first guess. The dipole only needs to create half a wavelength to transmit a full wavelength. But i don't know what a full wavelength making thingy dealy would look like.
@udulamethsara1980
Жыл бұрын
This is the only one from whole KZitem could explain this perfectly 🎉
@indridcold8433
4 жыл бұрын
It is sad just how much the education techniques and materials have degraded over the decades. (I think the Roman numeral year, at the end, is 1959) Now, price goes up, content goes down, quality disappears. This video reminds me of why college is such a waste of money today. I even fell for the college lie. It all worked out at the end by getting an unrelated job to what I studied. I am making far more than I could ever have made in the computer field, which is the unfortunate field I studied. None of the content was as methodically explained as this antenna theory. At least I paid my tuition loan in full, using my current job.
@breakingthemasks
3 жыл бұрын
What kind of job did you get?
@streaMania
2 жыл бұрын
I think education material should be updated, especially in engineering fields. They are teaching too much irrelevant information.
@indridcold8433
2 жыл бұрын
@@breakingthemasks I am a glorified grease monkey. I serve, repair, reprogram, hydraulic equipment, lorries, freezers, assembly lines, even the sales fleet vehicles of Estes Logistics. All I do is work with machinery all day. Granted, some of the work is network and computer related. But that is in all fields today. Should I have been a programmer at Blizzard Entertainment, I would max out around 180,000 for the very highest possible pay, which I likely would not have obtained. Today, I make far more than their senior programmers, their IT experts, their hardware engineers, and the such.
@simpleidea2825
5 ай бұрын
Even grade 10 students will be able to understand from this video. Hat off 🙏🏻🙏🏻
@frankbaron1608
2 жыл бұрын
for such a short film, this is suprisingly informtive and easy to understand.
@Frohicky1
2 жыл бұрын
I didn't think after that music it could get any better, but it did.
@NhậtNguyễn-r3i
Жыл бұрын
this is phenomenal. thank you for posting.. Really explained simple to understand, thanks for efforts.
@Leela_X
5 жыл бұрын
I tried to understand this many times.... Now I do!
@albertoolmos21
5 жыл бұрын
The electrons do not flow, the energy wave does. Like water in the sea there's a difference between a sea wave and a sea current. For instance, an anchored boat keeps waving up and down but it is displaced by the current if the anchor is taken. In electricity this is known as displacement current (the actual electron movement from atom to atom which can lead to a different compound [electrolysis]) and conduction (wave) current.
@ME-rv1pw
Жыл бұрын
If I can interject here: Electrons do, in fact, flow
@PinkeySuavo
5 ай бұрын
soo dont electrons flow? Batteries work by moving charge from one terminal to another one.
@JenkoRun
4 ай бұрын
@@PinkeySuavo Charge yes but not Electrons, they barely move and aren't even particles in the first place.
@MelanieEdgal
4 жыл бұрын
Excellent. I knew nothing about how antennae’s worked and I have a good grasp. I loved the repetition at the end.
@samihawasli7408
4 жыл бұрын
Screw it, I’m never calling the right hand rule again. Pun absolutely intended
@willson8246
4 жыл бұрын
4:42-4:52 Shows the E field and the H field is 90 degrees out of phase but at 5:54-6:00 when we combine the component of E and H fields together, why both fields are in phase?
@puchwdface1781
3 жыл бұрын
gothcha *E : 1 0 1 0 1 0* *H : 0 1 0 1 0 1* yet this Video was great thou
@chancenorris3409
3 жыл бұрын
Was thinking the exact same thing
@unclefrankindia
Жыл бұрын
Great work, simple explanation, had to watch it twice to grasp
@nivid01
5 жыл бұрын
Very good. Thanks, now I learnt a lot more about antenna theory, but I need to keep learning and put the knowledge into action.
@Regalert
7 ай бұрын
Man, old dudes must use 100% mind power and 100% effort, creating such billiant people.
@kevinrtres
11 ай бұрын
Brilliant explanation of the basics - thank you.
@MeMe-kq5xs
Жыл бұрын
Please post more videos. Much better explanation with the visualization than traditional textbook
@mohanjayaraman3291
3 жыл бұрын
Great 👌 Fantastic explanation Thanks to the lecturer
@burakapaydin9023
3 жыл бұрын
At 4:42 it is said that E-field and H-field are 90 degrees out of phase. Then they end up being in phase. I don't get it. Someone please explain that.
@jorgezuni2818
4 жыл бұрын
I’ve only know the sine wave form but never seen anything like this ..More visual dimension trough this video wow
@RosssRoyce
7 ай бұрын
In this diagram animation BOTH the VOLTAGE and CURRENT (fields) are drawn as strongest in the middle of the antenna. As far as I know one of them should be stronger at the tips of the antenna and the other weak at the tips but strong at the feed points.
@TheDesertRat31
3 ай бұрын
I think it depends on the wavelength relation of the antenna and where the feed point is. I recently saw a video that illustrated your exact point, but I'm trying to remember what was said. I found it by accident. I feel like it had to do with an end fed antenna, made at a fractional wavelength and showing why a center fed dipole is so desirable, but an end fed (while more practical in building and mounting) is a compromise electromagnetically. I think it was regarding building a 160m antenna. The guy was explaining the trade offs and difficulties in building such a long antenna for that band.
@nobodynowhere7163
Жыл бұрын
Best electromagnetics course ever.
@reidshillingburg5658
5 ай бұрын
I was definitely thinking an episode of Tom and Jerry was about to start after that intro..
@RemoMass
Жыл бұрын
Really explained simple to understand, thanks for efforts
@werre2
10 ай бұрын
now all it needs is more title screens and dramatic music
@naetuir
3 жыл бұрын
This was a great introduction. Thanks for sharing!
@KingsleyIjike
5 жыл бұрын
This is simply awesome! I recommend that students see this video before reading any of those intimidating books! lol
@to-tt7fc
5 жыл бұрын
I think any length of the dipole from one end to the other still radiate but full/2 (half) wavelength give you the most and consistent radiation.
@MarcelloZucchi91
5 жыл бұрын
You're right. Any integer multiple of half wavelength will make the dipole resonate and therefore radiate at its maximum capability.
@to-tt7fc
4 жыл бұрын
@K8BYP _ you are genius better than Einstein. Your circuit issue is your problem, not anyone else 's fault. Antenna is an integral part of the RF and it does not affect its performance ? Read more on 1/2,1, 1/4 ... wavelength dipole antenna to educate yourself.
@ryansanderson7023
3 жыл бұрын
@K8BYP _ David, you come across sounding like a jerk here.
@uberdang830
4 жыл бұрын
So the length is related to the frequency range you want to transmit and also the direction of propagation in your antana. You can build a quarter wave dipole that will propagate downward into a ground plane that pushes or reflects them. So you can build a directional antenna. I don't know how this works for a 3/4 wave antenna but. I'm trying to learn.
@EvaTruve
10 ай бұрын
Beautiful! Isn't it!
@jagabattunianand1284
4 жыл бұрын
Thank you so much for the video. It really helped me a Lot in understanding fundamentals
@atheistaetherist2747
3 жыл бұрын
The so-called flow of so-called electrons in an antenna or in any wire is a secondary effect. There is a slab of transverse E by H energy current flowing along the outside of the antenna/wire. As explained by Heaviside, Ivor Catt & Forrest Bishop. There is no such thing as charge or voltage. Also, skoolkids should be told that radio waves (ie so-called em waves) are a different animal to photons. And any explanation should involve aether.
@eyalbaum1254
5 жыл бұрын
why did the E vector switched directions when hitting a reflective surface but H didn't?
@jonahansen
5 жыл бұрын
A reflective surface is one with (ideally == totally reflecting) no resistance, so at the surface the solution to the wave equation, which is the sum of a forward traveling and reverse traveling wave cannot have an electric field (no electric field in a conductor). So to satisfy this boundary condition, the reverse traveling wave must have the opposite electric field so the sum at the surface is always 0. Hence, the exact impinging wave is reflected, inverted in polarity and summing with it. For a sine wave, this implies standing waves starting 1/4 wavelength from the surface and then at 1/2 wavelength intervals with nodes (no electric field ever) at the surface and then again at 1/2 wavelength intervals. Makes sense, eh? The magnetic field must stay the same for the Poynting vector to reverse, which identifies it as reflected, traveling the opposite directing. Just use the right hand rule for E x H for the impinging and reflected to verify this.
@knife-wieldingspidergod5059
4 жыл бұрын
@@jonahansen My brain just exploded.
@nithya1747
4 жыл бұрын
@@knife-wieldingspidergod5059 yeah me too
@-danR
3 жыл бұрын
@@jonahansen This explanation should start on a simpler basis. The reflector an electrical conductor. It is not a magnetic 'conductor' (what would constitute a "magnetic conductor" might be interesting, but needn't detain us here). *The E-field is reversed in polarity by simple counter-EMF, just as it is with any electrical conductor.*
@banjohero1182
Жыл бұрын
love the needlessly dramatic music on the credits
@randomdude1053
2 жыл бұрын
Damn as a Canadian signals soldier I never knew we used to make cool videos like this
@WR3ND
5 ай бұрын
1:04 - it should be noted that this visual representation is not a sign wave form but momentary pulses as it does not fade in and out. Indeed, radiating from one point wouldn't have the dynamic of traveling along a radiating element, so that doesn't mean it is necessarily incorrect, just not representative.
@WR3ND
5 ай бұрын
1:43 While electrons do move it is not the electrons themselves that are moving this distance but rather their electrical field, similar you could say to how a wave travels across water though the actual specific molecules of water aren't traveling the full length of the wave's propagation.
@chrisyo4461
2 ай бұрын
Im still learning....it will make sence soon
@crazyirishman121
5 жыл бұрын
Amazing animation!
@roncho
4 жыл бұрын
very nice this record looks very old but animations are great
@SpaceStickwithSpaceTick
Жыл бұрын
I thought they had the direction of the magnetic field wrong but electrons go reverse to current. It really should be with it, but I guess the left hand rule isn't as catchy.
@bigmackdombles6348
5 жыл бұрын
this is phenomenal. thank you for posting.
@margaretdesser2376
3 жыл бұрын
Great explanation.
@vk3aqz
3 жыл бұрын
This movie is based on old theory of the production of electromagnetic energy. Maxwell's equations predicted the formation of the direction of travel of the energy when an electric field and a magnetic field at right angles produces a force carrier at 90 degrees to the other 2 fields. Called the Poynting vector. In modern physic, Richard Feynman won a Nobel prize for his discovery of the electromagnetic force carrier. Feynman discovered that a photon consists of an electron and a positron pair which interact with each other. Over a cycle or period of photon energy exchange (the period is the inverse of the frequency), the electron will interact with a positron to form, for a brief instance, pure energy. The matter of the 2 particles becomes an energy function. The energy function cannot exist in its pure form for long, and condenses back to matter. The time this particle interaction takes place is the period of the photon, and determines the speed of movement. The energy function always forms at right angles to the spin or momentum of the 2 particles and thus moves in a direction perpendicular to the particle momentum. The electron moves in one direction (E) and the motion generates a magnetic particle (a momentum component change of the electron sometimes called a magnetron?) (H) perpendicular to it. The E direction will determine the location of the electron and is described as the polarity function. In physics, the photon is called the force carrier of the electromagnetic force. Radio waves are just long wavelength photons. Photons are produced when electrons jump energy levels around an atom. For short distances, such as the those around an atomic nucleus, the wavelength is very short and we see the photons as visible light. However electrons can also interact with other electrons and the resulting interaction can produce a whole series of different wavelength photons depending on the energy the electrons had at the time of interaction. This is all basic particle physics you will find in a good university text book. Now radio waves, as I said, are long wavelength photons and are created by the particle interactions inside the wire which must contain a significant number of free or loosely bound electrons. The antenna is connected to a source of electrons driven by a high potential energy force which is coming from the transmitter and its supply. The energy imparted to electrons in the wire causes bunching, and at certain points in the conductor, there is a potential peak and and at other points a potential well (you need to understand quantum physics to get a better idea here). During the particle collisions, positrons form, and once that happens, a free electron will be attracted to the positive charge, and now a photon forms. And that photon must move at right angles to the particles in the wire and hence move away into space. Once that happens we have what we call radio waves. Once away from the wire, the 2 particles continue to move and now interact with something we know little about - we give it a value of 377 ohms but in reality, scientists believe it may be the Higgs field which gives matter its form (now you need to read into much deeper physics here about symmetry theory -- fermions, Bosons, Quarks, etc.). The subject of what really happens is quite deep and scientist still do not have a good idea what an electron and a positron are - electrons seem to behave both as waves and particles. So if you want to know more, read some good books on particle physics and quantum theory. But one thing is certain - there is a lot more to the physics of what actually happens in a radio antenna - and there is no such thing as waves - waves only exist when a medium transports energy across its width or field. Radio waves are actually particles - long wavelength photons - not waves or fields - yes they move through a field (Higgs field?) but they are not the field or even a wave.
@victorb22622
3 жыл бұрын
Wow,realy very excellent tuition
@gnagyusa
3 жыл бұрын
Brilliant explanation.
@lalitthakur1360
2 жыл бұрын
Superb !!
@edreesalmansoori6051
4 жыл бұрын
Appreciate your time in making the video. Thanks deeply from my heart!
@mailamaila5918
3 жыл бұрын
Great stuff , my cup of tea
@dcamron46
Жыл бұрын
He says the peak happen in phase but the description at 5:00 implies they’re not…it’s as if the E and H aren’t maximized at same time in that illustration- which is wrong
@nathanas64
4 жыл бұрын
What a perfect explanation!!
@kiranchannayanamath3230
4 жыл бұрын
How E and H fields which are out of phase near the antenna , attain same phase after a certain distance ?
@ThatEEguy2818
4 жыл бұрын
My question exactly. No explanation anywhere that I've been able to find and I've looked.
@alexanderx33
2 ай бұрын
"the traveling wave is in time phase and space qudrature" What does time phase mean in this context?
@vijay0861
Жыл бұрын
Thank you very much for this video...
@vahagnmelikyan2906
Жыл бұрын
Why is the magnetic field coming out from the antenna not even at any point? As far as I know electricity flows evenly in the wire,so why would the center have stronger field than the edges?
@DominicGo
5 жыл бұрын
this makes me want to take an engineering course
@eknaap8800
5 жыл бұрын
First learn how to use capitals and proper punctuation...
@ganeshr3493
4 жыл бұрын
@@eknaap8800 he is not writing an exam here he just wrote a comment.stop banging your english tutor.
@xichen8267
4 жыл бұрын
Very valuable information!
@anthonywstanton
5 жыл бұрын
Thank you for posting! 73 de AC6GM!
@damensutherland7081
Жыл бұрын
I like how they say negative energy and it you flip the probes them it will be opposite
@PinkeySuavo
5 ай бұрын
2:30 can we actually imagine it as squeezing electrons? Aren't they in similar distances all the time?
@deafman4090
Жыл бұрын
Interesting that half way through they reversed the selection of colors (pink and blue) for the E field and the H field. I wonder if this was a mistake or on purpose?
@jaamacdagaale5145
3 жыл бұрын
Old videos make current generations dump.
@luggas5095
5 ай бұрын
Still dont get why first the the E and H field are 90 degrees out of phase but suddenly they are in phase 😢
@sagarrawat7203
Ай бұрын
Yah i am thinking this also that they should be 90 our of phase
@kristopherscott1228
2 жыл бұрын
Can this be made for VR? I only understand VR
@daviddickey9832
5 жыл бұрын
Wait....at 2:47 are those field lines supposed to be going the other direction by the way the current is travelling and the right hand rule?
@MateussCelioBR
5 жыл бұрын
The right hand rule uses the conventional current flow, that is opposite the real flow of electrons. In the video, is showed the flow of electrons...
@eggxecution
Жыл бұрын
great explanation
@urosmil
5 жыл бұрын
Great video!
@silverground3670
3 жыл бұрын
nice, now I can place my wifi antenna perfectly, so that it can connect to my neighbor's wifi
@satyavanu
Жыл бұрын
great video
@HaibatAli
5 жыл бұрын
Best to start, need more vedios on transient radiation from antenna if possible
@cloudchaser966
7 ай бұрын
I am not as impressed by this film as most other viewers seem to be. There are two major shortcomings: First, the question of why the "pulsating" electric and magnetic near-fields around the dipole travel out into space is not addressed. Instead, at 5:10 they weirdly move the "field of view" away from the antenna and just claim that there is indeed propagation with E always being perpendicular to H (which, of course, is true, but for somebody without prior understanding of electrodynamics, is not evident why that should be at all) Second, when they "explain" reflection at surfaces, they simply state that the E-vector is instantaneously reversed, while the H-vector is not (8:06). For someone who is not an expert (and therefore the target audience of this movie) this seems completely arbitrary, and no explanation is given as to why. So yes, the film is good in parts, but unsatisfactory in others...
@steve7730
Жыл бұрын
Very good information, Thank You
@KhalidHamid-q4f
26 күн бұрын
if you coming here from LinkedIn studying 350-401 in 2024 hit the like button
@kafkart60
Ай бұрын
on dipole electric and magnetic standing waves has 90 degrees phase difference. but propagating electric and magnetic waves has no phase difference. why and how?
@kafkart60
Ай бұрын
as i understand shortly. propagating h (magnetic) wave produced by dipole electric wave, so they are in phase. since changing e fields produce magnetic field at the same phase. from this video maybe we can say whenever e and h waves at 90 phase difference, they produce propagating em waves at the same phase.
@petertwiss356
5 жыл бұрын
Excellent video, but I think they showed (visualization) the E-field and the H-field in 180degress phase, when he stated 90-degrees.
@samuelj5890
5 жыл бұрын
look up your angles Pete
@techtinkerin
Жыл бұрын
Right so, what's a wave again?
@ThomasHaberkorn
2 жыл бұрын
what's the difference betwwen near field and far field EM-physics?
@HamedShahbazi
6 жыл бұрын
How they can be in time phase? ( E and H ) You said that they have a 90° different time phase!!
@jhonlejano
5 жыл бұрын
They are 90 degrees apart in space but in time they are in phase
@veronicanoordzee6440
4 ай бұрын
@ 0:47 A STATIONARY POINT-SOURCE DOES NOT EMIT EM-RADIATON.
@MrQuazar
5 жыл бұрын
so how it can be visualisation in 3 demetions? I understand at each point of space there will be changes in the magnetic and electric field vectors according to the wave parameters, but it is difficult to imagine visually other than spherical propagation. We will always be able to see only the projection of a 3-dimensional wave on the 2D plane at each point without being able to appreciate all the beauty. As if in primitive 3D games to save resources some 3D objects are replaced by 2D sprites.
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