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