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Yaiza
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Need help on my PCB design

Post by Yaiza »

Hello,
I am doing my first RF project. I want help regarding trace width calculations. I have to design 6 Layer PCB in FR 4 material which my first layer contains RF signals.
My layer stack up is like Signal, GND, Inner layer, Power, GND, Bottom.
I have a query regarding the RF PCB design.
1) RF signal contains in 1st layer so which calculator used? co-planner or Microstrip?
2) How RF Trace length important? any calculator for RF length calculation?
Please guide me as soon as possible as this is my first project and I have to submit it.
BTW I am using this free PCB software https://www.visuino.com/download to design PCB, it is easy to use and there is a cooperation between visuino and a PCB company, where you can get your PCB and PCB service at an adorable price. but I want to know is there any other free PCB software for a beginner?
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Orngrimm
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Re: Need help on my PCB design

Post by Orngrimm »

Welcome in the forums. Glad another user made the jump from instructables to here.

For the sake of completion, i repost the answer i gave over at instructables:
I would go with surface microstrip or if it neds to be shielded, a burried microstrip:
GND-"Roof" in top Layer, Signal in Layer 2 with a "wall" of GND-Vias alongside, GND-"bottom" on Layer 3. This makes a nice sort of shileded Coaxial cable within the PCB...
See the 3 attached images of Layer Top (Red), mid1 (Brown) and Mid2 (blueisch).
The impedance of this BLE-Antenna-connection of course had to be matched. We did the calculations with the Saturn PCB design - PCB toolkit 7.11 (free) and got 0.058mm width as Stripline and it worked perfectly.
https://saturnpcb.com/pcb_toolkit/

For free PCB-design-tools, KiCAD came a long way (Free). Eagle is also not too bad (Free).
If you are a student, be sure you check the Altium-offer on student licenses. Like 100$ only (instead of >8000!)
Attachments
Mid2
Mid2
2020-09-03 10-51-00.png (82.61 KiB) Viewed 513 times
Mid1
Mid1
2020-09-03 10-50-52.png (109.57 KiB) Viewed 513 times
Top
Top
2020-09-03 10-50-39.png (59.73 KiB) Viewed 513 times
Builder of stuff, creator of things, inventor of many and master of none.
Tinkerer by heart, archer by choice and electronics engineer by trade.
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Orngrimm
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Re: Need help on my PCB design

Post by Orngrimm »

Is this Q answered, Yaiza? see viewtopic.php?f=3&t=42
Builder of stuff, creator of things, inventor of many and master of none.
Tinkerer by heart, archer by choice and electronics engineer by trade.
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Orngrimm
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Re: Need help on my PCB design

Post by Orngrimm »

marking the thread as answered as a good answer was given and no follow-up-question was asked for a long time
Builder of stuff, creator of things, inventor of many and master of none.
Tinkerer by heart, archer by choice and electronics engineer by trade.
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