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3 Layer PCB? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


antenna_abc
Post subject: 3 layer PCB? Posted: Mon Jan 02, 2006 2:34 pm

Lieutenant

Joined: Sat Dec 31, 2005 11:51 pm
Posts: 3
Hi, everyone. I have a simple question about the PCB fabrication. Can I make 3 layer PCB or just the even number layer PCB? Thanks~


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IR
Post subject: Posted: Mon Jan 02, 2006 3:52 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello antenna_abc,

Usually PCB´s have even number of layers.

_________________
Best regards,

- IR


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Dan R
Post subject: Posted: Tue Jan 03, 2006 1:37 pm
3 Layers as in 3 metal layers? 3 dielectric layers?

Either way, you can make however many layers you want. Just remember that the boards have to stick together with something (prepreg).

--Dan


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Procyon PCB
Post subject: Three Layer BoardsPosted: Tue Jan 03, 2006 10:16 pm

Captain

Joined: Wed Aug 10, 2005 2:47 pm
Posts: 6
Location: Baltimore, Maryland
As stated above, you can have as many layers as you want, but most manufacturers only want to play with even number of layers, unless you are having a huge production run.

However, there are a few places like Procyon PCB, Inc. (yes, a little self promotion here, and I do advertise on this site) that will make prototype boards in any number of layers.

If you have any questions, please feel free to post back or e-mail me direct from my web site http://www.procyonpcb.com

Regards,
Ben

_________________
www.procyonpcb.com
Manufacturer of Quick Turn PCB Prototypes


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antenna_abc
Post subject: Posted: Wed Jan 04, 2006 12:24 am

Lieutenant

Joined: Sat Dec 31, 2005 11:51 pm
Posts: 3
Thanks for the information.

Actually I am designing a microstrip patch antenna with proximity-coupling, there are totally three metallic layers mounted on two dielectric layers.

There are a feeding trace placed between two dielectric layers, a radiation copper patch etched on the top layer and the ground plane on the bottom layer.

And I also want to add some blind plate-through vias from bottom ground plane to the inner metallic layer... Is it possible for nowaday PCB technique?

Procyon PCB, I am wondering if the aforementioned antenna PCB can be made in your company, how much will it cost for a small amount of phototype?


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Dan R
Post subject: Posted: Wed Jan 04, 2006 11:47 am
Most board fabricators should be able to do that for you.

I'm guessing it would be like the following:
It would have to be fabricated with one single clad (copper on one side) dielectric and one double-clad (copper on both sides) dielectric. Some sort of adhesive prepreg would be used to attach the two.

The bottom dielectric would have the vias drilled in it, then it would be plated, then etched. This would then be attached to the top dielectric (the single-clad one), which would be etched with the antenna pattern (before or after attachment).

It is essentially making two board and laminating them together. That's how you can get the blind vias.

What we have occassionally done here is have our antenna feed layer and the active patch layer fabricated separately. We then attach them ourselves using an adhesive like Y966. That would be a quick way to get it prototyped.

--Dan


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Procyon PCB
Post subject: Posted: Wed Jan 04, 2006 3:27 pm

Captain

Joined: Wed Aug 10, 2005 2:47 pm
Posts: 6
Location: Baltimore, Maryland
Antenna-abc,

I sent a PM to you. Please check your email.

Thanks,
Procyon PCB

_________________
www.procyonpcb.com
Manufacturer of Quick Turn PCB Prototypes




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