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darcyrandall2004

Post subject: RF Shielding Posted: Sat Mar 17, 2007 12:14 am

Colonel

Joined: Tue Feb 27, 2007 6:16 am

Posts: 46

Hello. Can anyone direct me to a manufacturer of RF shields that will supply free samples?

Lastly, can anyone direct me to where I can find some literature on RF shielding? Im particularly interested in learning whats the best practice, i.e can I shield my reference oscillator and PLL together or will one intefer with the other.... how I can avoid the need to provide shielding? Thankyou

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IR

Post subject: Posted: Fri Mar 23, 2007 6:59 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm

Posts: 373

Location: Germany

You can find many manufacturers by running a Google Search.

Here is an example to one:

www.masach.com

You can't avoid shielding if you design Oscillators and other frequency sources. Usually the reference oscillator and the PLL should be placed as close as possible to each other. If you have forward and reverse links on the same PCB then you should shield each of them to avoid coupling between the two which can produce feedback and lead to oscillations.

The purpose of shielding is to prevent radiation from propogating and to prevent coupling between adjacent frequencies.

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nubbage

Post subject: Posted: Mon Mar 26, 2007 5:38 am

General

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 218

Location: London UK

The Engineering Director of a well-known company for which I once worked (as a very young green-horn) often maintained that "the cheapest development equipment is a hacksaw", by which he meant "cut the lid off someone else's box and learn from what you see inside". Whilst I would not dream of advocating plagiarism, or still less, copyright infringement, you could learn more about screening by looking into existing products that use PLL-VCO circuits than by reading up the theory.

Screening theory is notoriously difficult from which to formulate strict rules. Even simple analytical situations of say a cylinder of metal enclosing an oscillator requires several types of Bessel Functions to derive the leakage field outside the can. Oisch, my brain hurts already, thinking of the pages full of math.

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