A door assembly for a microwave oven includes a door covering an opening of an oven housing. The door includes a bezel forming an outer frame to conceal internal door components and an inner door portion within the bezel made of a transparent material. An electromagnetic interference (EMI) attenuation device positioned around outer edges of the door includes folded transformer sections with dimensions based on an operative wavelength of electromagnetic energy generated by the oven. The EMI attenuation device attenuates EMI waves escaping the oven through a gap between the housing and the door. The transformer sections are positioned at an incline angle from a horizontal plane in which the transformer sections extend a greater distance in the horizontal plane than in a vertical plane to allow for a reduced bezel size and an increased area of the inner door portion.