What difference does a 4 layer PCB make to EMC radiated emissions compared to an identical 2 layer PCB? And why?<br /><br />Dave does H-Field near-field probe testing on two otherwise identical PCB's.<br /><br />Electromagnetic waves and the difference between near field and far field, and H-Field and E-field probes and wave impedance is also explained.<br /><br />The PCB layout is then examined to look at loop area and by-passing and what effect this has.<br /><br />Forum: http://www.eevblog.com/forum/blog/eevblog-1176-2-layer-vs-4-layer-pcb-emc-tested!/<br /><br />https://gigatron.io/<br /><br />Designing the 4 layer board: https://www.youtube.com/watch?v=Ep4r-wD7PPs<br /><br />Bypass capacitor Visualised: https://www.youtube.com/watch?v=1xicZF9glH0<br />PCB Power Plan Capacitance: https://www.youtube.com/watch?v=CBD9vwKcvtY<br /><br />Bitcoin Donations: 38y7DE8HEHNj8fGDtUr4PkCn9nWxiorvvy<br />Litecoin: ML7oQokTwB38bgzzjLDbRV97HKAHuwRfHA<br />Ethereum: 0x11AceA38DCA9DbFfB4F35f3F746af65F9dED28ce<br /><br />EEVblog Main Web Site: http://www.eevblog.com<br />The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2<br /><br />Support the EEVblog through Patreon!<br />http://www.patreon.com/eevblog<br /><br />AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g<br />Buy anything through that link and Dave gets a commission at no cost to you.<br /><br />Stuff I recommend:<br />https://kit.com/EEVblog/<br /><br />Donate With Bitcoin & Other Crypto Currencies!<br />https://www.eevblog.com/crypto-currency/<br /><br /><br />T-Shirts: http://teespring.com/stores/eevblog<br />Likecoin – Coins for Likes: https://likecoin.pro/@eevblog/dil9/hcq3<br />#PCBdesign #PCBdesign #EMC
