Re: LF: Printed Spiral Inductors - off topic

["Stewart Bryant" <stewart.bryant@virgin.net>]

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
>
> "This e-mail is intended for the recipient only.  If you are not the
> intended recipient you must not use, disclose, distribute, copy, print,
> or rely upon this e-mail. If an addressing or transmission error has
> misdirected this e-mail, please notify the author by replying to this e-mail."
>
> "Recipients should note that all e-mail traffic on MOD systems is
> subject to monitoring and auditing."