🚀 go-pugleaf

In article <55550031@hpscit.sc.hp.com>, rkarlqu@hpscit.sc.hp.com (Rick Karlquist) writes:
> In sci.electronics, pciszek@nyx.cs.du.edu (Paul Ciszek) writes:
> 
>> Suppose I want to use a wire mesh to block (reflect, actually) RF in the
>> gigahertz range.  I am well aware that the mesh needs to be "much smaller"
>> than the wavelenght (which is 30cm).  However, I need to use as skimpy (i.e.,
>> unobstructing) a mesh as possible.  Is there any quantitative expression
>> for how well a, say, 1cm mesh will block a 30cm wave?
> 
>> --
>> Paul Ciszek, pciszek@nyx.cs.du.edu | No nation was ever drunk when wine was
>>                                    | cheap.   -- Thomas Jefferson
> 
> Look at 3.7-4.2 GHz. mesh satellite TVRO dishes.  Presumably, these
> are optimally skimpy.  Then scale to 30 cm (= 1GHz.).  1 cm at 1 GHz.
> would be .25 cm. at 4 GHz. which is smaller than the TVRO dishes, so
> you ought to be fine.  Another existence proof is UHF TV reflectors
> which have wire spacing exceeding 1 cm. yet go from 500 to 900 MHz.
> 
> Rick N6RK
> rkarlqu@scd.hp.com

>> "Architectural Electromagnetic Shielding Handbook" by Leland H. Hemming,
   IEEE Press 1992, ISBN 0-87942-287-4, IEEE Order Number: PC0282-4, has
   some information on the shielding effectiveness of copper mesh. I no
   longer have the book in my possession, so I can't check to see how useful
   it would be for your question. You may also try the handbooks by
   Interference Control Technologies.
   Hope this helps somewhat!

 > Sandip

   Sandip Sengupta
   senguptas@woods.ulowell.edu