How Does An Antenna Work? | weBoost

RIP Don

Good explanation.... rest in peace mr.

Wow

why cant anyone else explain antennas this simply? this video was great, RIP Don

No, i don't understand...

We should donate a little something in memory of the guy.
He probably was a decent human being. Imagine, how his family would feel that people STILL appreciate his work!

Wawooooooooooo

I thought that electricity moves equally at any given point. I would've expected to see cylinder like wave coming out from wire, but instead the center of the wire has more streched magnetic field than the edges... or maybe magnetic field is like a disturbance of an ether field. The electrons push rhe ether evenly, but the ether that is pressed in the center has to travel further distance because of the pressure, while the edges under pressure are pressed to the sides and they travel less forward???

How does single vertical aluminum wire radiate waves?

great!'

Great
Thanks for the explanation

Well explained thanks!

Does the transmitted signal and the received signal on the antenna interfere with each other, if so, how do you solve it?

I a from Panama my native language is Spanish. I studied electronics back in collegue , and I can honestly say this is the best explanation about how an antenna works that I have heard in years. Thank you Don , Rest in Peace.

Does 4g or 5g cell phones have any interference with the TV antenna signals?

You nailed it thanks a lot man

I just subscribe me on the channel at the same time I knew he was gone! I'm very sad! R. I. P. Don

Hello .
Thank you for this video
Please make a video about the gold finder antennas

This answered 3 hours of googling in the 4 minutes.

Humans wouldn’t have discovered this when they did. Aliens taught us this otherwise I can’t believe it’s real

This is EXACTLY what school should learn out in entry level of radio.
We need to be younger in the ham society.
And nowadays when computers is a part of the hobby, the yonger people dont want to. They dont understand the antenna, and are not interested. They dont understand how important it is.
Im sorry for your loss, this guy would be awesome to teach that wifi and bluetooth actually are radio.
More radio to the society.
Best regards and 73, Sa1ckr

Very good video!

A coaxial cable was invented by genius physicist Heaviside, an antenna operates on alternating current, when current is passing through a wire it creates a magnetic field around it. The magnetic field creates EMI around the conductor and EMI is not free it's not only interference but all so power loss on the path. So we need something to catch our magnetic field from the central wire and not only catch but all so neutralize it somehow. That was a difficult task at the time and really even now you would have to spend some time to understand the physics behind the coaxial cable. Heaviside was not understood even by his fellow scientists in his times and the coaxial cable is difficult to understand. The basic idea behind it is that you can view a coaxial cable as a continuous loop around a wire. When current flows on the inside wire it creates a magnetic field around the wire - the outer coaxial ring but the outer coaxial ring at this moment is moving a charge in the opposite direction to the central coaxial wire, therefore it creates a magnetic field of its own. An opposite charge is moving by the outer ring that can be viewed both as a loop and a conductor, the charge moving through the outer loop induces a magnetic field on its own surface but only with an opposite to the magnetic field induced by the center wire sign. We have one field induced by the central wire on the outer coaxial ring with + sign and another equal magnetic field induced by the outer ring itself on itself with the opposite - sign. These fields are exactly equal and they cancel each other out. No noise around no power losses on the path.
Please note that this effect is only possible with high frequency currents. Because with high frequencies the current is not flowing through the wire but rather hovers over it. The higher the frequency is the higher the current hovers over the conductor. It hovers outside of the central wire and inside of the negative outer ring. If you visiualise that - you'll see that both currents with both directions are moving inside of the coaxial wire through the same outer ring basically hovering in the insulator. And that creates an electromagnetic field on the outer ring with the opposite sides which cancels each other out and that's how the shielding of the coaxial cable works. With DC coaxial cable miracle isn't happening or rather the effect of the shielding is very small because the current on the outer ring is too close to the surface - no charge passing through a ring. That is the reason why it's only used with high frequencies. For low frequencies it has a "transparent" shielding because the loop for the magnetic fields for the current traveling in the opposite directions is no longer the same.

Teachers are always cherished by their fondest students who feel empowered by knowledge. Life is much like an antenna .....a series of losses and gains looking for resonance with surrounding signals.

It's the fact that antennas radiates something that is invisible to my eye. A visible light bulb doesn't elicit any spoooky fantasy.

That was the best explanation of an antennas that I have ever seen, thank you.

Why does it have a stupid bloody music track?

oh it jumps off the wire... I see... to receive it just jumps on the wire huh? There's got to be better explanations than this...

Great video. Simple and informative.
Any chance you have a video explaining how this energy translates into information?

What a nice guy!

Plz explain how currrent flow from one wire to other wire

RIP Don. I heard a lot of good things about this guy, I joined the Weboost team a few years after. I didn't know these videos existed. What a smart and humble guy.

Dear Sir. you did NOT get a degree in electronics, from watching this video.

I don't think that 'jumping' part of radiation is the right description. I think it is best described as 'pushed away'. I figure the critical question in this regard is this: Why does the field fly away? Why doesn't it just collapse back onto the radiator? If the peak of the arc of the field is close enough to the wires the field will collapse almost completely back onto the wire and there will be no far-field radiation. But how close is close? It's the reason that physically short, (relative to the wavelength,) antennas are such lousy radiators. The peak of the arc of the field has to be far enough away from the radiator that at the speed of light it doesn't have time to collapse back onto the radiator before the next cycle of that same polarity begins to expand and opposes it, pushing it still further away. In short, an antenna works as a pump. Once the field has been pumped far enough away from the antenna it keeps on going. So it's clear that the relationship between the size of the field's arc and the frequency of field reversals determines the effectiveness of radiation, at least out to a half wavelength, the largest possible arc. The lower the frequency, the longer the antenna radiator required for the same efficiency since the lower frequency gives the initial field more time to collapse, so the arc of the field has to be larger. I don't know the math to describe it but that perspective has always made sense to me, and I'll bet any field theory math that follows from that perspective works correctly.

Thanks

Thank You Don

Thank you Sir, we apparently went to the same school of thought kiss keep it simple stupid I appreciate your video man great job

Great insight

finally, someone explains this in a very simple to understand lesson...no formulas , no hard to learn theory....just simple

I will miss don, a fellow brother in arms

The question that almost all students ask and never gets answered is; "How does the signal leave the antenna into a medium that has no substance?" A dipole is not the best explanation starting point. How about an infinitely long wire where the signal departs and never returns! We even know the impedance of free space in ohms. An interesting parallel is the skin effect, signals riding on the outside surface instead of the centre. It boils down to the velocity factor in wire rather than air or space. A dipole is just a long wire with a finite length. Any conductor length less than infinite has a reflecting end point where there is bunching up and a spring-back. How much signal escapes along its transit? How many times does the signal bounce back and forth on a two ended dipole before it escapes. A more attainable ideal antenna is the rhombic with very long divergent arms. Even here there is a termination resistor whose purpose it is to absorb the yet un-radiated signal from returning from the finite ending.
Robert Livingston, VA7WN

What would you say is the best deep fringe TV antenna with the smallest footprint ?? Gary-hoverman maybe.

Great

why is there high energy or some energy as opposed to no energy when the oppositely charged wires are separated?

Much has been made of the importance of STANDING WAVES- that there must be standing waves on an antenna for it to radiate e/m waves. I guess that this means the antenna is "resonant". So with a resonant antenna, there will be a minimum of this " cancellation" that u speak of, so that "standing waves" of maximum amplitude will be set up on the antenna by the transmitter. A maximum current amplitude will set up a corresponding magnetic field amplitude. Similarly a maximum voltage amplitude will be accompanied by a maximum electric field amplitude. And it is these magnetic and electric fields that radiate into space-i.e. if the driving frequency is high enough, then these magnetic and electric fields cannot "collapse" back into the antenna, but must detatch themselves from it-and thus move out into space. Also, although u want standing waves on the antenna, u definitely do not want them on the transmission line-i.e. the coaxial cable that u spoke of.

BIG like <3

Good explanation for randoms but this has no detail for the EE’s

thanks.. u answered my question that i keep for many years

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How does it work on a stick antenna like a telescopic antenna as it's only a single wire?