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June 2010

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Subject:
Re: Pewter as RF screening material
From:
Inge <[log in to unmask]>
Reply To:
Inge <[log in to unmask]>
Date:
Wed, 16 Jun 2010 22:12:43 +0200
Content-Type:
text/plain
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text/plain (222 lines) 
--------------------------------------------------
From: "Eric CHRISTISON" <[log in to unmask]>
Sent: den 14 June 2010 16:43
To: <[log in to unmask]>
Subject: Re: [TN] Pewter as RF screening material

> "Speaking RF signals at radar levels,  magnetrons,
> klystrons,  TWTs and other high power sources,  I would not use pewter."
>
> You're talking of peak pulse powers in MW here aren't you?
>
> Can't you figure out a minimum thickness for any screening material based 
> on something like resistivity and loss tangent, it's called skin depth or 
> something?
>
>
>
>
>
> On 14/06/2010 15:18, Mike Fenner wrote:
>> Hmm....
>>
>> Some lead free solders are not a million miles from pewter.
>>
>> Regards
>>
>> Mike
>>
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
>> Sent: Thursday, June 10, 2010 7:01 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Pewter as RF screening material
>>
>> Hi Grant,
>>
>> any METAL case will work.  What you create is a Faraday cage, that will
>> eliminate electrostatic and electromagnetic influence. However,  it will 
>> NOT
>>
>> eliminate static magnetic fields, nor low frequency electromagnetic 
>> waves.
>> In such a case you'll need ferro materials,  one of the best being so
>> called mu metal.  But, as your question was about RF, pewter will work, 
>> not
>> as good as ferro materials, but it depends on the pewter wall thickness. 
>> In
>>
>> many modern electronics, you get acceptable RF shielding by means of 
>> plastic
>>
>> boxes with a thin metal coating only. Works for weak RF signals, which 
>> are
>> often the case within commercial products like mobile telephones and
>> transistor radios.  Speaking RF signals at radar levels,  magnetrons,
>> klystrons,  TWTs and other high power sources,  I would not use pewter.
>>
>> Inge
>>
>> --------------------------------------------------
>> From: "Grant Emandien"<[log in to unmask]>
>> Sent: den 9 June 2010 11:22
>> To:<[log in to unmask]>
>> Subject: [TN] Pewter as RF screening material
>>
>>
>>> Hi,
>>>
>>> Does anyone used lead-free pewter for RF screening purposes?
>>>
>>> Pros&  Cons?
>>>
>>> Regards
>>> Grant
>>>
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>
> -- 
> Eric Christison Msc
> Mechanical Engineer
> Consumer&  Micro group
> Imaging Division
>
> STMicroelectronics (R&D) Ltd
> 33 Pinkhill
> Edinburgh EH12 7BF
> United Kingdom
>
> Tel: +44 (0)131 336 6165
> Fax: + 44 (0)131 336 6001
>
>
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