4.1 Antenna Basics

This video was made for a junior electromagnetics course in electrical engineering at Bucknell University, USA. The video is designed to be used as the out-of-the-classroom component and combined with active learning exercises in class. This video covers some vary basic facts about antennas, or devices that are designed to couple electrical energy from circuits into waves propagating through free space.

[hgerry]

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

[alchemy]

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.

[ahmedismail]

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

[engmahdi]

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.

[Jsmitht]

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

[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.

[abhinav.mishra]

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

[ikerbecerra]

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

[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?

[nosknut]

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

[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.

[Avionics]

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?

[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?😅😅