I am using the approximation that this cylinder is very long, longer than the other dimensions, then I can solve it as a two dimensional problem and find the capacitance per unit length. I am also assuming that the plane is much larger than the distance D to the cylinder of radius R, then I can approach the problem as PEC cylinder above a PEC plane, an image plane. then by the image theory you can substitute the flat plane by a cylinder of the same dimensions as the other one but with different polarity. So the equivalent problem is now two cylinders of radius R separated by 2*D. that is an analytical problem that can be found in the literature (among them Cheng "fundamentals of engineering Electromagnetics" Addison Wesley) and whose solution I posted in a previous message
Vicente RodrÃguez, Ph.D., E.I.T. RF/Electromagnetics Engineer ETS-Lindgren (an ESCO Company) P.O.Box 80589, Austin TX 78708-0589 phone 512.835.4684 x648 fax 512.835.4729 [email protected] http://www.emctest.com http://home.austintx.com/~vicenter > -----Original Message----- > From: Cortland Richmond [SMTP:[email protected]] > Sent: Monday, December 18, 2000 10:56 AM > To: Vince Rodriguez > Subject: RE: Capacitance calculation > > Vince Rodriguez <[email protected]> wrote: > > > >>You can use image theory and just get the capacitance between two > cylinders separated by 2D<< > > That doesn't sound right. How is the capacitance between two objects > separated by some distance going to be equalled by that between two > objects > (and one of them is smaller than before) separated by TWICE the distance? > > This is an experiment that can easily be done with common test equipment. > > Cortland ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
