I'm working on a project that has a 13.56 MHz RF power source. The thing is, the EM waves emitted by this power source cause problems with the diagnostic equipment of the actual experiment (various capacitive and inductive sensors). So, I am planning to build a faraday cage to shield the source as to reduce the interference level. I searched the forums and it seems that as long as the mesh of the cage is less than a wavelength, it will do a decent job. Using the folrmula λ=v/f , I get 3*10^8 / 13.56*10^6 = ~22.1 meters....so if I understand this correctly, if I make a wooden cage (like a plastic carton) and space metal mesh cables about a foot apart into a grid on the wooden frame (making 1 sq ft openings), that would do the trick? Also, please help me understand the underlying theory behind this one wavelength thing. Thanks!!!