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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 18 Nov 1999 07:33:14 -0500 |
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While it is possible to design functional circuits at 900MHz in FR-4 it is
not generally recommended for circuits with frequencies exceeding 500MHz
Analog or Effective Frequencies of 1GHz. There are a number of high
performance materials in the market that are much better suited for this
type of application. Rick Hartley does a presentation on this subject and
the paper he wrote gives several recommendations on the material properties
to be considered in the design of high-frequency designs. His paper is
available in the PCB Design Conference Proceedings or from the IPC.
Jeffrey A. McGlaughlin
PCB Designer
Battelle Memorial Institute
Columbus Ohio
[log in to unmask]
-----Original Message-----
From: Ko Adeline-FSGA2298 [SMTP:[log in to unmask]]
Sent: Thursday, 18 November, 1999 07:10
To: [log in to unmask]
Subject: [TN] PCB board material for high freq product
> Hi there,
>
> My engineer is asking me to design a 900Mhz 4-layer brd using the
> following information.
> As this is my first time doing such a high freq brd.
> I wish to know, is this PCB material perform excellent in high
freq.
>
> PCB Info
> Top layer --> 1/2 oz copper
> Prepreg --> 2 X 1080
> Layer 2 --> 1/2 oz copper
> Prepreg --> 2 X 7118
> Layer 3 --> 1/2 oz copper
> Prepreg --> 2 X 1080
> Bottom --> 1/2 oz copper
>
> Brd finishing thickness : 0.031" +/- 0.005"
> Material : FR4.
> Plating : Tin / Lead 63/37 HAL
>
> Thanks & Best Rdgs
> Adeline Ko
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