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Can FR4 be used at 5.8GHz? - RF Cafe Forums
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James
Post subject: Can FR4 be used at 5.8GHz?
Unread postPosted:
Fri Jul 08, 2005 1:43 pm
Does anybody have experience using
FR4 at 5.8GHz?
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Guest
Post subject:
Unread postPosted: Sat Jul 09, 2005 12:33 am
Why not?. I used
FR4 upto 17GHz. No more RT Duriod.
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IR
Post subject:
Unread postPosted: Sat Jul 09, 2005 3:58 am
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Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello,
FR4 has a high loss
due to its high TanD. Also FR4 has an unstable dielectric coefficient.
That is working against you if you have to implement printed elements:
Couplers, Filters, Baluns etc. The only motivation to use FR4 is only
for low cost. A known solution is to combine between 2 types of substrates:
FR4 and
ROGERS 4003/4050 for example. In this solution, you can implement
the printed elements with the ROGERS and the rest of the design with
FR4.
_________________
Best regards,
- IR
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James
Post subject: Thanks IR.
Unread
postPosted: Mon Jul 11, 2005 12:53 pm
Right. Low cost is what
I am looking for. I am using FR4 with 10 mil RO4350 now. Two risks come
with using FR4 only. One is whether I can build power spliter/couplers/baluns
on board. The other is will it have too much loss. Is there any PCB
supplier who are very experience in doing FR4 PCB for RF application?
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IR
Post subject:
Unread postPosted: Mon
Jul 11, 2005 2:14 pm
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Site Admin
User avatar
Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello James,
I don't think that the manufacturer should be
experienced in doing FR4 for RF application. You should do the effort
on a good PCB layout and pay attention to good layout practices - and
there are plenty to follow.
Any medium to large PCB manufacturer
with good workmanship quality will do the same on your RF PCB. You should
ask the manufacturer to check the impedance of your PCB in the layers
that carry the RF signals. The manufacturer usually provides a report
of that test together with samples of the PCB.
Should you need
more information, please let me know.
Good luck!!
_________________
Best regards,
- IR
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James
Post subject: Thank you IR
Unread postPosted: Tue Jul 12, 2005
5:37 pm
Thank you IR!
Posted
11/12/2012
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