Homepage - RF Cafe
Webmaster: Kirt Blattenberger | KB3UON | Sitemap | ©1996-2014     Visit RF Cafe on
      Menu below is just a small sample of what is here!          Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
Custom Search
More than 10,000 searchable pages indexed.
•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Analytical parasitic estimation - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


Camelot
Post subject: Analytical parasitic estimation Posted: Thu May 10, 2007 9:26 am

Captain

Joined: Fri Jan 19, 2007 10:36 am
Posts: 7
Hello,
I hope it is not a too much weird question…
We all know that if you have two metal layer with a distant d and thickness th1, th2, we could calculate the capacitance for area unit with C = (Er*Eo)/d. My question is, in order to get merely an estimation, does someone know if exists such as similar formula for calculating the capacitance for perimeter unit between the edge th1 of the first layer with the surface (with infinite extension) of the second?

Thank you very much!

Camelot


Top

nubbage
Post subject: Posted: Fri May 11, 2007 10:33 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Hi camelot
I suspect that the structure you are enquiring about is the structure that actually makes the formula value of C = the measured value of C.
The classic formula assumes the electric field is perpendicular to the plane of the plates. Without the device you seem to be mentioning, the field at the edge of both plates actually curves outwards before returning to the plates. In consequence the formula in that case does not predict an accurate answer corresponding to what you will measure with a bridge.
The extra plate is called a fringing plate (I think) and is always used for constructing a standard reference capacitor. It has the effect of restoring parallelism to the E field between the plates, a situation for which the formula is valid.






Posted  11/12/2012
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
Your RF Cafe Progenitor & Webmaster
Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an
                                 engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem! (Seize the Day!)

5CCG (5th MOB): My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website