you may try to design  a spiral inductor instead . Download the free
software called Appcad (from Agilent) , it has spiral inductors design. Play
some what if scenarios with it and you'll see if you can do it one way or
another, with and without vias .

Best Regards,
Matt Tudor , MSEE

----- Original Message -----
From: "John C. Echols" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, March 28, 2004 3:32 PM
Subject: [PEDA] Antenna coil


> I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
> a phone line....now that you're through laughing my question is - my
> present project requires a coil for an antenna for a "prox" card
> reader.  The coil is about 3.25 X 4.25", 700uHy and takes 60 turns of
> mag wire.  Can I do this with traces? The easiest would be 30 turns on
> one side and one via to do 30 on the back.  I'd probably go .004/.004"
> so it's not too hard for the board house and would only take .24 width
> of board space.  Will this work or is the spacing too big?  Or do I need
> to do one turn on top, the next on bottom, next on top, etc?  All the
> vias would take up too much room.
>
> Thanks for the help.
>
> John Echols
>
>
>



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