RF PCB Design Guidelines MAR 2019

Learn some core concepts in RF Design with the team in our latest session!
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[@JamesKao3D]

I love the concept for this webcast where a subject matter expert explores designs via the tool live. It's extremely useful since the kinds of things that Joel does while altering the design (e.g. moving the polygons around, trying different trace widths) are things that real prototypers will do and can learn from, not only from the design principles but also from the Eagle usage tips that Jorge chimes in on. Awesome!

[@ingmarm8858]

Where's the subject matter expert? I see a dude who kind of sort of thinks maybe you don't need to worry about using a microstrip or CPWG if the track length is less than 1/4 wave!!! Then fumbles around saying that all you need to do is trim the IFA (inverted F antenna) a bit to get an appropriate impedance match to the transceiver without completely revisiting the matching network. "Oh well maybe you'll get a little attenuation but you can fudge it". The way to do this is to use a VNA or proper simulation tool followed by the VNA. The magic spectrum analyser will do nothing for you in this scenario except show you relative field strength. No doubt he can layout PCB but not RF and he shouldn't be presented as anything that resembles a design reference for RF. Caveat Emptor just because you saw it on the internet doesn't make it right!

[@CodeJeffo]

Great content. More of these!!!

[@simonndungu1196]

Quite good, Thanks

[@Leif_YT]

Thank you for publishing such videos - it was a very interesting and helpful content.

[@zhitailiu3876]

in 2-layer board, the transmission line should be coplanar setup.

[@spsarolkar]

Nice video, I have question regarding ground plane , is it required to have ground plane on the bottom layer opposite to pcb trace antena? in some places its mentioned we need to have ground plane on opposite layer of antena trace, so it would be good if you clarify that

[@wolfganglienbacher]

I agree with James Kao about how cool this format is. But I really have to admit that this also demonstrates to me once again how painful Eagle is to use. We are about to have 2020, and it is still as painful as it was when I used it in school in the very early 2000s. I really hope Autodesk is going to improve this significantly in the forseeable future, although I am afraid this is asking too much. Let me add I do not want to believe it actually is asking to much.

[@316728237]

HOW DETERMINE ANTENNA WIDTH AND SHAPE OF TRACE?

[@seshansesha7645]

Very useful , Thank you.

[@tejeshwvardhan1165]

for 1.6 mm FR4, the width has to be around 3mm to match impedance. the result are still not satisfactory! the impedance matching is for path or antenna?

[@timonsku]

What is the use of the via with the grounded PCB antenna? It just sits somwhere randomly close to the outgoing trace but seems like it could just as well be omitted?

[@AutodeskEAGLE]

Hi Prof. Sparkles! May you please specify where you see this? Thanks

[@akshayjoshi2538]

Hello Prof. Sparkles, As frequency of signal flowing through circuit increases,Impedance becomes prime concern, And as we know current follows least impedance path, It must have to switch between the planes. Vias provides least impedance path to current. So it is better to put vias near high frequency traces.

[@gharbisalem1254]

I think it will be important if you put shielding vias around antenna traces too?

[@AutodeskEAGLE]

Hi Gharbi! Thanks for your question. Shielding vias around antenna traces will in most cases hamper the antennas performance. In fact it's imperative that you avoid having any ground plane underneath the antenna. Cheers!

[@gharbisalem1254]

@@AutodeskEAGLE sorry i'm meant by that stitching the antenna output trace before even designing the antenna . thank you for your response

[@ashaychugani4940]

Whats the residence of the resistors that were added next to the ufl connector?

[@darshanpithadiya8207]

I think 0 ohm

[@darshanpithadiya8207]

For isolating UFL and PCB antenna

[@gatlingword]

easy neck form ham ?

[@SSnoWHand]

www.eznec.com - EZNec it seems.

[@anneallison6402]

hahaha I searched for the same hahahaha

[@guilhermefarenzena7083]

Can you send me the bill of material in excel file ?

[@winstonalf]

Why don't you do this in KiCad ? much faster

[@anneallison6402]

cause they sale eagle