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September 2006

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Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Wed, 6 Sep 2006 13:23:52 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (61 lines)
Krishnan,

Only your CAD RF engineer can do this job. He/she just has to know the
dielectric properties of the laminate you use, the thickness of
dielectric and copper, length and width of trace, and distance to other
parts on the board plus RF power. With this information put into
computer, you will get an answer, that you direct to the PWB
manufacturer. 13 MHz, sounds like typical home electronics, like the one
below.

http://www.copytag.com/acatalog/actinic.html?http%3A//www.copytag.com/ac
atalog/13_56_MHz_Antennae.html&CatalogBody

Inge 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Balasubramanian
Krishnan
Sent: den 5 september 2006 16:41
To: [log in to unmask]
Subject: [TN] Impedance coupon design for differentials signal without
reference plane

Dear All,
      For an 13.56 MHz antenna trace (25 mil wide & 400 mm long) running
between 2 pins of a differential transceiver (Tx1 & Tx2) we want to
maintain dimensional tolerance of + / - 10 % (trace width & trace
thickness including masking)? What has to be specified in the
fabrication notes for this?
      There is no reference plane below this trace.  How to ensure the
impedance tolerance is within 10 %? How should be the impedance coupon
designed for this purpose to do TDR measurements?

Sincerely

K.Balasubramanian
Project Leader - Hardware.

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