EEVblog #1176 - 2 Layer vs 4 Layer PCB EMC TESTED!

What difference does a 4 layer PCB make to EMC radiated emissions compared to an identical 2 layer PCB? And why?

Dave does H-Field near-field probe testing on two otherwise identical PCB's.

Electromagnetic waves and the difference between near field and far field, and H-Field and E-field probes and wave impedance is also explained.

The PCB layout is then examined to look at loop area and by-passing and what effect this has.

Forum: http://www.eevblog.com/forum/blog/eevblog-1176-2-layer-vs-4-layer-pcb-emc-tested!/

https://gigatron.io/

Designing the 4 layer board: https://www.youtube.com/watch?v=Ep4r-wD7PPs

Bypass capacitor Visualised: https://www.youtube.com/watch?v=1xicZF9glH0
PCB Power Plan Capacitance: https://www.youtube.com/watch?v=CBD9vwKcvtY

Bitcoin Donations: 38y7DE8HEHNj8fGDtUr4PkCn9nWxiorvvy
Litecoin: ML7oQokTwB38bgzzjLDbRV97HKAHuwRfHA
Ethereum: 0x11AceA38DCA9DbFfB4F35f3F746af65F9dED28ce

EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2

Support the EEVblog through Patreon!
http://www.patreon.com/eevblog

AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g
Buy anything through that link and Dave gets a commission at no cost to you.

Stuff I recommend:
https://kit.com/EEVblog/

Donate With Bitcoin & Other Crypto Currencies!
https://www.eevblog.com/crypto-currency/

T-Shirts: http://teespring.com/stores/eevblog
Likecoin – Coins for Likes: https://likecoin.pro/@eevblog/dil9/hcq3
#PCBdesign #PCBdesign #EMC