Capacitance of Double-sided PC Board

Watson A.Name - 'Watt Sun' · 2003-08-16T11:28:06+00:00

I took a piece of double-sided phenolic PC board and put it on the cap meter. For a sheet that is 10.5 in. by 12 in. or 126 sq. in., I get 2074 pf, or 16.46 pF per sq. in., or 2.55 pF per sq. cm.I didn't have any double sided glass epoxy - I used that up making PC boards decades ago - so I was wondering how that compares to the glass epoxy PC boards. Has anyone ever measured a piece? What did you get?I've seen RF tx projects where the supports for the components are made from small squares of PCB, having probably less than 2 pF. I've also seen RF low pass filters where the PCB is used for the capacitor to ground (plane) of the pi filter. So does a PCB capacitor have a reasonable Q? I've also seen projects where they recommend using teflon PC boards for low loss at RFs, usually UHF or above. -- @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@###Got a Question about ELECTRONICS? Check HERE First:### email address is whitelisted. *All* email sent to it goes directly to the trash unless you add NOSPAM in the Subject: line with other stuff. alondra101 Don't be ripped off by the big book dealers. Go to the URLthat will give you a choice and save you money(up to half). You'll be glad you did!Just when you thought you had all this figured out, the gov'tchanged it:

Aug 16, 2003 42 Replies

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Mark Jones 22 years ago

You realize, you've gotta spraypaint "Tim's bucket-o-blaze" on the side of that thing with hi-temp manifold paint, right? :)

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John Fields 22 years ago

--- Do you, in addition to all your other shortcomings, also have an attention span so short that you've already forgotten that you asked whether most PCB's today are made with G-10?

-- John Fields

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Tim Williams 22 years ago

Gnaw, it's used enough that any further indication would be redundant :)

Tim

-- In the immortal words of Ned Flanders: "No foot longs!" Website @

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