Wi-Fi signals: reflection, absorption, diffraction, scattering, and interference

[@davidclifford4536]

I'm a retired engineer teaching my 16 year old grandson electronic fundamentals. I'm fortunate that he is an eager student. Your use of simple examples rather than esoteric jargon to educate your students is simply brilliant. I can't thank you enough.

[@relaxhub4178]

this is very wholesome, wish you and your grandson a healthy long and happy life.

[@GilangRamadhan-fq7ny]

Terimakasih buat Sunny Classroom karena video bapak mudah dipahami dan dipelajari, Saya jadi sedikit mengerti tentang Reflection dan Diffraction Reflection / Pantulan Gelombang elektromagnetik menghadapi hambatan dan memantul kembali ke sumbernya sehingga menyebabkan hilangnya sinyal. Sinyal ex mencerminkan Plafon dan tidak sampai ke PC kita karena ada dinding di tengah dan mencegah sinyal masuk ke PC kita. Diffraction / Pembelokan Gelombang elektromagnetik menghadapi penghalang dan terpecah menjadi gelombang sekunder dan terus merambat ke arah yang berbeda contohnya seperti sudut meja, lemari, dan kursi

[@se2702]

Sunny, you never let me down with you very fine videos. Thanks so much sir!

[@PeaceLoveUnityRespect]

Thank you for making this video and sharing your valuable information 👏

[@Adjudicators]

Always happy to see you've got answers for my questions.

[@sunnyclassroom24]

Great to hear that.

[@joels7605]

So you're saying I should take my wifi access point out of the fridge?

[@fincorp222]

Very informative video. Thanks so much!

[@FadelAzs]

Penjelasan sangat spesifik, mudahdi mengerti bagi yang mengerti bahasa inggris, dan tidak bosan di bagian animasinya ✴️✴️✴️✴️✴️

[@bizzhat]

this was Very helpful! - thank You. > just finished restructuring my room, only to notice how utterly crap my wifi reception is.. the brick wall was a given, but now the PC is also under a solar panel, behind about 20 wooden obstacles. next to the magnetic loudspeakers, in a corner ò_ó

[@santoshipanda9106]

It's very helpful 😊

[@juanrivera1443]

Reflection electromagnetic wave encounters an obstacle and bounces back towards its source thus causing loss of a signal. Ex signal reflecting Ceiling and not getting to your PC as there might be a wall in the middle and prevents signal from directly getting to your PC.(ex only) absorption materials would reduce wireless signals strength ex. water and brick walls, concrete walls metal walls, fridge diffraction electromagnetic wave encounters an obstruction and splits into secondary waves and continue to propagate in different directions ex. Tables, sharp edges, corners, desks scattering is diffusion of a wireless signal when it encounters an object’s uneven surface, the main signal then dissipates and causes signal downgrade and signal loss ex. Plant leaves, dust, smoke or micro drops of water in the air (all have uneven surfaces remember) Interference anything that communicates on different frequencies ex. 2.4 frequency baby monitors, cordless phones, microwave Leave a Like!

[@4u25out]

Which direction does wifi signal travel?, upward or downward?. My wifi router is downstairs, I strong signal upstairs..just curious.

[@josephvanwyk2088]

Thanks, I knew this was true. People KEEP telling me walls and water don't effect wife signals.

[@waynereloaded87]

does glass effect wifo signals?

[@miyurosewood3837]

@@waynereloaded87 depends on glass's epsilon. which usually close to 1, so no.

[@madhurimaburagohain7438]

Keep making more videos ! Your videos are very helpful !

[@anawr5168]

that is a perfect explanation of how wifi signals can be attenuating through different types of obstacles, my questions are: how can I control the wifi signal and see the reflected wifi signal from the mouth motion? how to locate someone position firstly using wifi signals? that will help me in my senior project? please answer me as fast as u can ...

[@mohammedk.h.f3016]

Thank you, Mr. Sunny.... a very useful video.

[@clippercv3802]

Watching this bc I got my sisters old room that has led lights and led lamps and light bulbs that are all Bluetooth so I think they’re interfering with my PS4 and causing my WiFi to spike

[@thegaribovv]

Thank you very much, very good explained.

[@mamtakundal9617]

Nice😊

[@mannuddchala1940]

Good one🎉

[@azzamf.khayyat8072]

Thank you for the effort, I need the sources for the info if it's possible.

[@eggxecution]

excellent!

[@kingcobra4528]

You didn't mention penetration rate on different materials of different wavelengths. Hoping to see video on this subject

[@salahuddinmurad8210]

Fantastic sir.

[@sunnyclassroom24]

thank you very much for your kindness.

[@saaidalkamha7240]

How do i make sure that both signals reach the receiver when talking about diffraction :)

[@safakeskin5338]

So, can we say that the difference between scattering and diffraction is scattering is occured when the main signal is reflected but diffraction is occured when the main signal keeps propagating into its direction, right? And the common property is both of them causes new signals being produced that have less energy than main signal. Am I right?

[@sunnyclassroom24]

You are right.

[@bluedolphin5784]

Ha sunny ni moj ha

[@JOHNPAULOKAFOR]

Nice one sir

[@SmarchitectMann]

I was wondering if this big old fish tank was affecting my wifi TV. I knew it wasn't just a coincidence, because that smart TV works perfectly... Unless there's running water in an aquarium.

[@no-de3lg]

The question is what is absorption how a material substance matter or your tissue or body absorb it the atoms or electrons reemits it ? Or just vibrate or the electrons move to higher energy level please explain wht is absorbing actually is

[@rickfeuerbach9010]

My old Lenovo phone has an aluminum body and my current Galaxy S20 has a TPU "bumper case" with a matte bottom, where only the backing is made of metal, including the camshield and the mirror at the extremity, also made of metal. Can this metallic part of the cover significantly interfere with Wi-Fi and 5G waves?

[@sdadeveloper5223]

sir you are cool, i liked your video

[@sunnyclassroom24]

Thanks a lot for your kind words.

[@मधुरमातनिया-म2ठ]

Sir, if very strong winds are blowing, then will winds influence the Wi-Fi signals??? Please Reply 🙏🙏🙏

[@xianchen1935]

All his examples referred to physical/touchable objects, so I'm not sure if wind counts. But rain for sure.

[@मधुरमातनिया-म2ठ]

@@xianchen1935 how rain can affect the Wi-Fi signals? I couldn't understand the logic.

[@xianchen1935]

@@मधुरमातनिया-म2ठ Refraction can happen with water, since it has low density unlike walls, so Signals coming coming outside could be interrupted on their way to receivers during rain

[@rabinkanisha7503]

Diffraction and scattering, does it mean the same

[@Anonymous-ed4id]

Who the hell is doing the thumb-down all the time?! Shame on you!

[@sunnyclassroom24]

Thank you! I appreciate it!

[@prasadksr6459]

we have 2 wifi routers of different brands. They dont seem to be interfering.Both signals are fine.I didnot check their freq. How can it happen please?

[@sunnyclassroom24]

As long as they use the same wifi standards, these two devices can work together. For example, different brand-name TVs all work the same way.

[@pushpakumarmanohar8070]

Can we visualize wifi signals through software?

[@us3anddog]

Do metal roofs interfere with WiFi or cellular service?

[@xianchen1935]

If your computer is on your roof and the router below the roof, then yes

[@essrasabri1750]

Hi.. How come the AP can stil transmit data while enclosed inside metalic cage?

[@AMAZINSNYM]

Maybe the router or cable modem is up against the wall same for the AP on the otherside. Realistically, the person will run an ethernet cable through the wall or door.

[@seandafny]

Low wavelength

[@miyurosewood3837]

describe cage. If there is any opening bigger that 1.75 cm it would transmit. If it isn't grounded, it would bleed. We we say faraday cage, it should be _solid_ walls of perfect conductor. No conductor is perfect and usually those are made of mesh, but if openings is magnitude smaller than wavelength and is not mutiple of wavelength (you risk difraction in this case), it filters most of signal.

[@garykuppers9161]

Our internet keeps cutting off mainly at a certain time and for approx 5 minutes...most nights ...almost like a timer ...if it's a neighbours equipment, what can we do to stop this?? Engineer checked our phone line and said it's good, also got new router...no objects near apart from cordless phone...driving us nuts...any solutions??

[@sunnyclassroom24]

it sounds like a mystery. I wish I knew.

[@shryr8319]

thanks!

[@sunnyclassroom24]

you are welcome!

[@lucidviolin1298]

How do I fully block wifi signal?

[@tjuk8050]

When you say (salt an vinegar) does it sound like (sore finger) LOL

[@muhannadtahboush9914]

Dear Dr could you provide us video about how nodes can communicate with each other in MANET. thanks alot

[@sunnyclassroom24]

I put your request on my to-do-list

[@ahemednor5201]

🙏🙏🌹🌹

[@explorenature2983]

I have issue with wifi my devices are disconnected from router. I replaced router even change channels. If you have any solution please reply here

[@sdadeveloper5223]

it can be a hacking attack knowns as deaunthentication or jamming

[@AMAZINSNYM]

Best answer i have is to buy a router that has a firewall so you’ll need a password to get in as it sounds like someone is picking at your router and denying you access.

[@Ferronful]

👌🏾💯

[@gileneo6999]

watched

[@darkkiller1239]

Man I didn't know that metal interfered with wifi I literally had my Xbox between four metal rods and a metal roof and bottem

[@mishazujev31415]

ironically you made three typos in the same term (diffraction)

[@omondisamuel3649]

Taro Nagazumi

[@stargate905]

OMG my modem is beside my fridge...crap