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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Mirror as ground plane
Date: Wed, 27 Nov 2024 17:07:35 -0000 (UTC)
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legg <legg@nospam.magma.ca> wrote:
> On Wed, 27 Nov 2024 14:24:20 -0000 (UTC), Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
> 
>> legg <legg@nospam.magma.ca> wrote:
>>> 
>>> Anyone had experience using metalization on glass (mirror) 
>>> as a ground plane or shield?
>>> 
>>> Any data on conductivity etc?
>>> 
>>> RL
>>> 
>> 
>> The best quality second-surface mirrors are coated with silver, followed by
>> copper plating and a coat of paint.  Those should be pretty good if you can
>> get wires on them. 
>> 
>> Poorer ones have aluminum coatings around 2-3 nm thick and no plating.  
>> 
>> Cheers 
>> 
>> Phil Hobbs 
> 
> I think pressure contact will be good enough, so long as its renewed 
> regularly, maybe with a conductive grit.
> 
> Will have to treat the isolated glass surface with something to 
> reduce static, or stuff will start flying away at inconvenient 
> times.
> 
> RL
> 

Won’t work on an unplated film, of course. Indium solder applied with an
ultrasonic iron is one approach—you need to avoid cracking the film, which
will cause extreme flakiness. 

Cheers 

Phil Hobbs

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics