4.1 Antenna Basics

[@hgerry]

Brilliant - very clear diagrams, a good pace and nice intuitive descriptions. Thank you.

[@Radheshyam-do5nq]

Very easy explanation...

[@jwrosenbury]

The electric and magnetic fields explain the near field. The far field (radiation into space) is a result of special relativity's effect on accelerating charges. The emitted photons slow the electrons (or possibly positive charges, but electrons in nearly all antennas) which causes the radiation resistance.

[@robbydelocht]

Tnx for explaining

[@maryamshahbazi6107]

Great video thanks!

[@engmahdi1418]

Thank you for your persuasive explanation. I need someone to tell me which text book the teacher is using please( full name). I'm student and it's useful for me.

[@altuber99_athlete]

Perhaps you already graduated, but for future readers: the textbook is Fundamentals of Applied Electromagnetics, by F. Ulaby.

[@alchemy1]

I guess another lie we were told, that to have current of any sort in a wire it needs to make a loop and come back to the source. Now you can have current in an open circuit. I was aware that with enough high voltage you can get spark jump in a spark plug, but not electron jump. And now this: You can have photons come out of wires and the catch is simply to bend them exactly at 90 degrees as a result of electron current, but open to space and not loop back as one wire.

[@boeing757pilot]

The circuit isn't open. The separated wires form a capacitor. The capacitor "passes" the high-frequency AC...

[@Jsmith32t]

How come you exclude Maxwells Displacement Current when describing a working antenna?

[@abhinav.mishra17]

As the radiation is happening and at the same time the reflection coefficient is 1, with this whole energy will be reflected?

[@cbwatters]

From 5:26 the blue E fields point in the same direction even though the current and magnetic fields have changed direction. That cant be right.

[@TerranIV]

Exactly what I was going to say. The induced E fields in the "Side View, Later" section on the right side of the slide are incorrect. They should be opposite from the left side view.

[@Avionics1958]

Thank you for your explanation it is very clear and to the point. I have a question, How can I know the distance the radiated waves travel from the antenna? any general formula?

[@ssrk4281]

Kittu

[@ahmedismail1018]

what is the name of your book we want to download it pls

[@ikerbecerra4402]

How do I make a antenna to get military frequencies or police frequencies

[@fidoz90]

we are not in the 80's :D

[@sanjaytumati]

So you bent just a bit of it and got an antenna. Great! What if you bend much more of it? What happens then?

[@TerranIV]

You would tune the antenna to a different wavelength.

[@nosknut]

So can someone please explain to me how current can flow through a dipole antenna when the circuit is not closed?

[@beharajagadeesh9001]

it's as simple as capacitor charging and discharging

[@nosknut]

@@beharajagadeesh9001 how can it charge and discharge when the current has nowhere to flow

[@nosknut]

Especially with low voltages

[@beharajagadeesh9001]

Charge will accumulate on the antenna because of applied voltage (according to signal) and discharges accordingly applied signal

[@nosknut]

@@beharajagadeesh9001 what about rc antenna with a single long wire

[@TheHurtDoctor]

THIS IS NOT WHAT I CAME TO TALK TO YOU ABOUT TODAY 6:01

[@raymingpcbassembly]

Antenna Design and RF Layout Rules ( Part I ) @t

[@dnlarts]

Essentially no offence to the professor, but does he do this essentially on purpose?😅😅