HackadayU: Introduction to Antenna Basics - Class 1
ฝัง
- เผยแพร่เมื่อ 13 ก.ค. 2024
- This is Class 1 in the HackadayU: Introduction to Antenna Basics course with Karen Rucker.
Introduction to radio frequency engineering for antennas. Topics covered will be, but are not limited to: electromagnetic waves, impedance matching, polarization, gain, and frequency bands.
Learn with us: hackaday.io/u/
Playlist for the Introduction to Antenna Basics series: • HackadayU: Introductio...
0:00 - Start
2:06 - What’s an Antenna?
7:02 - Maxwell Equations
9:18 - Electromagnetic Waves
12:48 - Polarization
17:40 - Gain
20:42 - Radiation Patterns
23:19 - VSWR
27:50 - Impedance Matching
31:28 - Frequency Bands - วิทยาศาสตร์และเทคโนโลยี
Thank you for your time to put this together and explaining the high level to us. Your audio is just fine.. my focus is the content and being able to understand antenna design more after these 5 classes then I did before. Thanks again!
Absolutely brillant : an extremely clear and pedagogic presentation. i finally understood a lot of things thanks to this class. i'll look forward to the rest.
I have no idea what people are complaining about, I didn't notice her saying "right" over and over, at all, seemed like a perfect delivery to me. Good tone of voice, patient, walks through the material just fine. I'm hoping to get into the weeds a bit on the next few classes.
OMG thanks for this course, perfect level of detail for makers, people who work with wireless systems, and aspiring HAM's
Really appreciate you guys doing these videos.
Thank you.
I really enjoyed this session and the occasional dry humor. I had just listened to a talk at MIT on antennas put on by their radio club and it was little over my head. This session was more of what I needed to start to get a solid foundation in antenna theory, which has been on my mind for several years now. Thanks.
I personally like how you explain things in simple terms
Fantastic, looking forward to Class 2.
Excellent explanation!! Thank you
This was excellent and easy to understand! Thank you.
thanks for posting! very helpful.
Now I know how I will spend my weekend :) Thanks !
Thanks for the course! An omni directional antenna has a gain of 0 dBi. Using dB values in beneficial when calculating link budgets, because you can add and substract instead of multiply and divide.
Yeah, 1 = 0 dB.
Great explanation. Thanks 😊
this is cool, thanks for making this open
Very useful, thanks.
Great Class
Thanks, Karen
you mention 'YAGIE' ? would be nice isnyou explain what that is when you mention it. Also, as an engineer, i know we have tons of acronymns. in out circle we don't say them but expand the names: that is we'd say Voltqge Standing Wave, not "VSWR". acronyms are hand y when typing, but not talking, especially if teaching newbies. great course. look forward to the others, thanks very much
Thx for this very Helpful video.....The "Ole Boys Club" can't stand it to be outdone by your superior delivery combination of witt & making the student feel very comfortable trying to absorb the very complex engineering principles.....
Thanks for lecture 🎉
Many Many Thanks
Ah Smith Chart Work of Old times, now we have advanced Vector Network Analyzers, and Computer Software for anyone even an Electronic Engineering Technician can use to design antennas. Keep on Learning.
Thanks
thank you so much
Thanks 👍
thank you
Returnloss as per shown formula is always positive: since Pref never exceeds Pinc, the result Pref/Pinc is
1. Class!
ty )
You say the gain of an isotropic antenna is 1 dB. That is wrong. The power gain is 1.0, which is 0 dB.
LB8X
Yup... beginning at circa 5.20... the slide says that an isotropic antenna has a gain of 1 dB. I always thought an ideal isotropic radiator was assumed to have a gain of 1 (and not 1.122) But, probably just my ingrained engineering culture... like rounding off calculations. Today I learned differently!
I sometimes get beat with a metal coat hanger. Will it also work as an antenna?
👋🎩👍 New sub from Ottawa
could i ask best books on topic i have studied it much in past
polarization mismatches are often bypassed then the signals are bounced from the ionosphere. in this situation polorasation is kind of lost.
Hello. Do you upload your notes?
What's the imperial unit for frequency, though?
I watch all.i can ...
I came here hoping to figure out how to hookup my antenna. These videos are so good that now, I only want to hookup with Karen😍 I’ll sort out all of this antenna techno-jargon and stuff later on... :P
🤗🤗🤗🤗🤗🤗🤗
I didn't exactly understand how you engineer the different degrees of polarisation
wavelength is horizontal, both antennas are vertical, the only way this would work is if the vertical amplitude is always equal to wavelength and this has always been my question which no video has answered, because the horizontal plane is time related.
Gross concept error
If polarization only refers to the direction of movement of electric field E, then how is circular polarization possible? It shows two waves in red and blue. I thought we only care about the electric field wave.
It's the E field X component, and E field Y component that you see
That's the linear polarization. Circular polarization requires the waves to be out of phase by a quarter, then it will create circular polarization - hard to see in the 2d world, requires more intensive graphics to illustrate.
Good. My question: Why don't digital TV signal equipment use the same as mobile telephone equipment. I can stream mobile video content perfectly inside my house without having to have massive TV antenna on roof. Why do TV companies insist on there system needing such a fussy and aligned antenna. Love from OZ
Right!
I am a technician..in RF and big radio operator
I would use more illistration. Some people won't follow you I am a professor in Cybersecurity. Also read the latest research an asymmetric antenna at microscopic level.
We need to talk about feedline and volocity factory ..
Right?
I’ve landed here looking for information about how ancient buildings act as Antennas which I study for my work as an architect.
A common temple structure is an outer rectangle, mainly solid with an inner rectangle of columns. The column grid is also cubic. The columns are made from granite, under load from the weight above and so creating a piezo electric field around the column. The column structures are usually fractals of cosmic geometry such as the earth diameter which I guess would tune in to any waves emitted. I believe the earth is giving out a c# note.
Am I on the right track studying this? Is there such a thing as a cubic antenna grid. Any direction of what to learn would be great.
Your sound is great. I have made a few videos which have poor sound but they would never have been published had I worried about it. It is the content that matters. This is excellent content for someone at my level.
from u,i can see a lady not only beautiful but also knowledgeable
Any number to the 0 power = 1. Db to the zero power = 1, not 1 Db..... Db to the 0 power has a gain of 1, not 1 Db. When ever you use Db as an engineering label you are referring to two numbers, one of them is the reference. Whereas a gain of 1 is a single dimension number not in reference to any other number, Dbi indicates the reference is to an isotropic antenna whose gain is 1, not 1 db.. an antenna who's gain is 3dBi, is 3Db better than an isotropic antenna which has a gain of 1 and is the reference.... I am open to being corrected on this should I be incorrect. We learn from each other, no?
You try to be super correct with audio quality and filling words, but manage to write the units of 'dB' in 3-4 different ways in just one comment. As far as i know, only the lower case d and upper case B are the correct symbol for decibel. As a fellow engineer, you should know about the importance of upper- and lower case letters in symbols, the difference between milli (m) and mega (M) can be quite large too...
@@ProtonOne11 good point, we all learn from each other....
Might want to work on those verbal foibles...right? ;)
Also, it's never a good idea to try and cater to more than one type of knowledge level at a time (e.g., beginner vs. advanced). You'll always tend to lean towards the high end, even if you don't notice it, like you did here. I know 'cause you lost me five min. in.
Thank you for this series, it's appreciated and informative. I am not sure what the point of adding "she" to your name is? Do people really get it wrong sometimes? We need more women in tech with your skills and experience, and I'd hope your colleagues, friends and viewers are all cognitively able and courteous enough to determine how to address you without needing a prompt. It seems rather unnecessary and distracting, as if it's some sort of secret signal you use in your part of the world: if so it's certainly one that's passed me by! Again, it's great to see more women in this field, respect!
Of all the things in this lecture, you are worried about a pronoun check😂. Seriously?
Right? Right? Right? Right? Right? Right?
how does this industry continue to be evolving despite the obvious biological harm, does money speak more to people in their jobs rather than the care for the environment and preservation / function of all life?
Sounds like too much reading of notes not engineering flow of someone with hardcore knowledge talk of antenna engineering. In my opinion of course.
Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'? Righ'?
Didn't notice this at all. Try paying attention to the material.
I think this could be a very good and educational video, if the lecturer would stop repeating the word RIGHT, so often, as is I can’t finish the video.
I didn't even notice it. I had to listen again to hear her say it, and took several minutes of video to hear it. Weird what people complain about.
Great information and very nice graphics to go along with an overall good presentation. I was grateful she didn’t get stuck saying the “and uhms “ like so many do but I have to admit feeling bothered by the “right” being used so frequently at the end of sentences.
Right??
Unfortunately, this is just about every lecturer today. "Right?" used to be used to gauge understanding in communications. Now it's just kind of annoying and way overused.
I was in toastmasters - learning how to give speeches - her use of ‘right’ is just a version of ‘um’ LOL
you disract me ya know, right?
Are those her pronouns?🙄
Her constantly asking, "Right?" is annoying.
Better than the Indian guys constantly saying "OK?" in Udemy courses..
Poorly explained
With all due respect....Your audio is done in a very lively room, sound bouncing off the wall and ceiling, So your microphone is listening to a multi-path audio signal. Your audio is hollow and resonating to your room acoustics.....Out here in TH-cam land we can here the room coloring your audio. As an engineer you should make sure this never happens on your live broadcasts or in your recordings. Believe it or not the human brain burns more energy processing such audio. In a way it is stressing the listening circuits of the brain, So be aware of the liveliness of the room, and the distance the recording microphone is from your mouth... sorry to be critical.. But I am advising you to improve your acoustics when making such transmissions.. I am looking forward to all you have to say about antenna electronics. Please think of me as a friend,,, a fellow engineer. Extra Class Licensed Radio Operator, like your self..
LOL...seriously?
Weird, audio sounds perfectly fine here. Very well done.
bad explained. unclear, not simple details facts and order
Great content but not great communicator....right?, right?, right?
Why do you keep saying that? Its clumsey and makes you sound like your unsure of yourself. Kind of a mismatch at what you know and your ability to communicate it.
Quit sayingthe word “right” every 12 seconds. It is very distracting.
Ok with me🙃
One last critical point..... you are over using the word "right?" as an interrogative... to fill empty space.. which you need to train your self not to do... other people make the same mistake using the word "um" or "ah". "Right?" comes from the valley girl culture....now a passe colloquialism. It distracts from your otherwise excellent presentation...
And as a note for you - all of this completely unsolicited advice and criticism coming from a stranger is very unlikely to have the kind of effect you're looking for. I'm honestly cringing at the fact that Karen might come to these comments and have to read stuff like this, having clearly worked ridiculously hard putting this stuff together. Really, next time you're thinking of posting these kind of comments, just stop and think about how it's going to come across to the other person - no matter what your intentions are. Most of the time the best option is just going to be: Don't do it.
another interesting HackadayU i won't watch because of the bad sound..
how hard is to invest in a microphone if you are going to do a tutorial?
golden rule: never speak to a microphone from more than 20 cm away.
The audio is fine here, not sure what problems you're having :)
Audio is just fine here, not sure what problems you're having at all.