On 2/11/17 10:22 AM, Poul-Henning Kamp wrote:
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In message <589f4a79.3050...@rogers.com>, MLewis writes:
Late yesterday I placed old neoprene rubber mouse pads, rubber side
outwards, up the metal blinds between the blinds and the antenna.
I can guarantee you that it is not the neoprene itself which does it.
It could be residual ZnO, used to catalyze polymerisation of the neoprene,
but more likely it is metal deliberately added to the neoprene to
change the RF impedance of the material.
Or to make it heavy, so it lays on the table better. They could just
load it with sand or iron oxide or scrap whatever.
Polymers with varying metal content offer a handy range of
electromagnetic impedances between "short" and "open"[1], and it
is used a fair bit in various niche markets.
See for instance the first document here;
http://www.eccosorb.com/resource-white-papers.htm
It is not inconceiveable that off-spec or scrap materials from
the production might end up as mousemats.
I don't know if the production volume is high enough.. one never knows..
Eccosorb and related RF elastomers are sufficiently expensive that they
must do something with it.
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