Jeffrey, I have an excel spreadsheet that our materials engineer uses to calculate that information. I can't send it through the forum so let me know if you'd like it sent to you directly. Bob Harter, Jr. PCB Designer Paratek Microwave, Inc. 6935 G Oakland Mills Rd. Columbia, MD 21045 PH# (443)259-0140 x278 CP# (443)739-8407 WWW.PARATEK.COM -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey A Sent: Thursday, March 10, 2005 9:14 To: [log in to unmask] Subject: [DC] Interdigitated Coplanar Capacitor Design Does anyone have a recommendation on a design guide for calculating the capacitance of a coplanar interdigitated capacitor? We have a couple of RF packages the do structures but they are impedance at frequency based and we need true DC capacitance for this application. Thanks In Advance, Jeffrey A McGlaughlin, CID Engineering Designer Battelle Memorial Institute Columbus Ohio http://www.battelle.org [log in to unmask] ------------------------------------------------------------------------ --------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ------------------------------------------------------------------------ --------- This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email or [log in to unmask] and destroy all copies of the original message . --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------