Return-Path: Received: (qmail 22182 invoked from network); 29 Nov 2002 11:15:04 -0000 Content-Transfer-Encoding: 8bit Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 29 Nov 2002 11:15:04 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 10747 invoked by uid 10001); 29 Nov 2002 11:14:55 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 29 Nov 2002 11:14:55 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18Hj6H-0000Zo-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 29 Nov 2002 11:14:25 +0000 Received: from [192.5.29.49] (helo=relay.dstl.gov.uk) by post.thorcom.com with smtp (Exim 4.10) id 18Hj6H-0000Zf-00 for rsgb_lf_group@blacksheep.org; Fri, 29 Nov 2002 11:14:25 +0000 Received: (qmail 10124 invoked from network); 29 Nov 2002 11:14:17 +0000 Received: from warlock.dstl.gov.uk (192.5.29.10) by relay.dera.gov.uk with SMTP; 29 Nov 2002 11:14:16 +0000 Message-ID: <7D653C9C42F5D411A27C00508BF8803DCB9D07@mail.dstl.gov.uk> From: "Talbot Andrew" To: "LF Group \(E-mail\)" Date: Fri, 29 Nov 2002 11:13:54 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Subject: LF: Printed Spiral Inductors - off topic Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Spam-Status: No, hits=1.0 required=5.0tests=EXCHANGE_SERVER,SPAM_PHRASE_03_05version=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group 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."