If you want it to work OPTIMALLY, you need to use thicker materials that are solid. The cage would also be attached to a low resistance Earth ground. Aluminum is FAR less desirable than steel and to a lesser extent, copper.
Using thinner materials that aren't solid i.e. metal screening, etc... that lack a low resistance path to Earth ground can also produce beneficial and highly usable results. How well you want it to work and how much you want to spend may dictate certain cost-cutting techniques to be implimented. Such are the design variables that any project / product encounters. Sean
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PS... Don't forget to address cabling coming in and going out of the device as these can act as EMI / RFI conduits also.
Using thinner materials that aren't solid i.e. metal screening, etc... that lack a low resistance path to Earth ground can also produce beneficial and highly usable results. How well you want it to work and how much you want to spend may dictate certain cost-cutting techniques to be implimented. Such are the design variables that any project / product encounters. Sean
>
PS... Don't forget to address cabling coming in and going out of the device as these can act as EMI / RFI conduits also.