CHOKE STRUCTURE FOR IMPROVING ELECTROMAGNETIC WAVE SHIELDING PERFORMANCE BY INCREASING BAND WIDTH ACCORDING TO INCREASE OF LENGTH OF CHOKE PORTION

摘要

PURPOSE: A choke structure is provided to achieve improved shielding performance by increasing a band width in accordance with the increase of length of a choke portion. CONSTITUTION: A door frame(31) is bent such that an attenuation choke(60) arranged along an inner circumference of the door frame has a choke portion(61) with a length(L') elongated into the inside of a cavity(2) so as to increase a band width of the choke and improve an electromagnetic wave shielding performance. The attenuation choke having the choke portion with adjusted height and width is arranged along the inner circumference of the bent door frame.