shielding SMPS- must the shield enclose entire circuitry?

[eem2am]

shielding an SMPS

Hello,

If an SMPS is to be shielded to prevent it from radiating to the environment…..

-then is it true that the shield must enclose the entire SMPS circuitry, or else the radiation will simply be emitted by diffraction out of any gaps in the shield?

 

[FvM]

shielding an SMPS

There's a parameter named wavelength.

 

[trstlm]

Re: shielding an SMPS

There's a parameter named wavelength.

Yes your are correct. Apetures on the SMPS walls ( for signal cabling and ventilation) are the raditation coupling paths. Aperture will resonate at half the wavelength, and it will start allowing the EMI from that frequency.

 

[leo_o2]

Shielding should be grounded well.