Return-Path: Received: (qmail 7383 invoked from network); 3 Apr 2002 09:37:54 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 3 Apr 2002 09:37:54 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 17405 invoked from network); 3 Apr 2002 09:37:55 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 3 Apr 2002 09:37:55 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16sic5-00068F-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Apr 2002 12:07:37 +0100 Received: from mail2.cc.kuleuven.ac.be ([134.58.10.50]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16sic4-00068A-00 for rsgb_lf_group@blacksheep.org; Wed, 03 Apr 2002 12:07:36 +0100 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail2.cc.kuleuven.ac.be (8.12.1/8.12.1) with SMTP id g339Sv3n007926 for ; Wed, 3 Apr 2002 11:28:58 +0200 Message-ID: <3.0.1.16.20020403102400.30975ab6@pb623250.kuleuven.be> X-Sender: pb623250@pb623250.kuleuven.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Wed, 03 Apr 2002 10:24:00 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: LF: more loop inductance In-reply-to: <3.0.1.16.20020402140550.30cf29da@pb623250.kuleuven.be> References: <19519.020329@dx.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Having a closer look at the formulas for different loop shapes gives an indication that there is a correlation between the inductance of a loop and the ratio of perimeter^2/area. If this is correct it would allow to get a formula for rectangular loops : L = 0.4*(A+B)*(ln((A+B)/d)+7.6-0.35*(A+B)^2/(A*B)) where L = loop inductance in uH, A = loop height in m, B = loop length in m and d = wire diameter in mm The formula would be valid for loops where B/A does not exceed 6. Does anyanoe have actualy measured the inductance of a big square loop ? I would be interested to check the measured values against the calculated ones. 73, Rik ON7YD