Patent ID: 7429721

Claim:
A heating apparatus using an electromagnetic wave comprising: a body forming a cooking cavity for accommodating foods; a door provided to an open front side of the body, the door having a sealing cavity at an upper end of the door; a choke filter located at the sealing cavity, the choke filter including a choke part arranged by at least one row each along an edge of the door and a filter part arranged by at least one row each along the choke part, the filter part comprising a plurality of ribs and slots formed between two adjacent ribs, wherein each of the two adjacent ribs has a base portion of the rib and a tip of the rib extending from the base portion toward an outer edge of the door with partitioning an operational space of the choke part from an operational space of the filter part in order to configure an LC circuit independently; a flange part provided to an external end portion of the door along the edge of the door, wherein an upper surface of the tip and a top surface of the end portion of the flange part facing the body are coplanar; and a glass panel covering the sealing cavity, wherein the tip of the rib and the slot are positioned along the edge of the door alternately and repeatedly.