From: "John W Gould" <g3wkl@btinternet.com>
To: rsgb_lf_group@blacksheep.org
Date: Fri, 29 Nov 2002 12:06:16 -0000
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Subject: LF: RE: Printed Spiral Inductors - off topic
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Andy, yes - I'll copy the relevant section from Brian Wadell's Transmission
Line Design Handbook.

73 John, G3WKL

> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Talbot Andrew
> Sent: Friday, November 29, 2002 11:14
> To: LF Group (E-mail)
> Subject: LF: Printed Spiral Inductors - off topic
>
>
> 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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