Patent ID: 8787038

Claim:
A chassis for an electronic device, comprising: a main housing including a base plate and two opposite side plates integrally formed together, wherein each side plate includes a first extending plate, a connecting plate and a second extending plate having equal thicknesses, the first extending plate perpendicularly extends from one end of the base plate, the connecting plate perpendicularly extends from a distal end of the first extending plate, and is parallel with the base plate, and the second extending plate perpendicularly extends from the connecting plate, and is parallel with the first extending plate; a removable cover including a main portion and two opposite side portions, the side portions latched on the side plates, a space defined between each side portion of the cover and each side plate of the main housing, wherein each side portion includes a first sidewall, a connecting sidewall and a second sidewall having equal thicknesses, each first sidewall perpendicularly extends from one end of the main portion, the connecting sidewall perpendicularly extends from a distal end of the first sidewall, and is parallel with the main portion, the second sidewall perpendicularly extends from the connecting sidewall, and is parallel with the first sidewall, the first sidewall is spaced from the second extending plate, the connecting sidewall is spaced from the connecting plate, and the second sidewall is spaces from the first extending plate; wherein a plurality of projections are formed on the second extending plate, a plurality of grooves are defined in an inside of the second sidewall for receiving the projections, a waveguide is formed between the first sidewall, the connecting sidewall and the second sidewall of each side portion and the first extending plate, the connecting plate and the second extending plate of each side plate to attenuate electromagnetic radiation produced in the space.