Message-ID: <3DE752B8.2020508@virgin.net>
Date: Fri, 29 Nov 2002 11:42:48 +0000
From: "Stewart Bryant" <stewart.bryant@virgin.net>
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To: rsgb_lf_group@blacksheep.org
References: <7D653C9C42F5D411A27C00508BF8803DCB9D07@mail.dstl.gov.uk>
Subject: Re: LF: Printed Spiral Inductors - off topic
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Google returned a large number of hits in response
to the term

spiral inductance

Of these,

http://www.csgnetwork.com/spiralcoilinduccalc.html

is a javascript programme, which you can see by doing
a view source, and if necessary reverse engineer back
to the equations

Stewart G3YSX


Talbot Andrew wrote:
> Sorry if this is somewhat off topic, but I am looking for the design
> equations for spiral inductors printed on PCB material, with or without a
> groundplane.   I vaguely remember seeing some equations in one of the
> freebie RF magazines a few years ago, but can't find it.  A web search has
> not pointed at anything useful - yet.
> 
> I need to design some bandpass filters in the 300MHz and 600 to 800MHz
> ranges and want something more repeatable than bits of silver plated wire.  
> 
> Can anyone lay their hands on the design equations ?
> 
> Tnx
> Andy  G4JNT
> 
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