Patent ID: 7067782

Claim:
A magnetron comprising a choke coil connected between a cathode terminal and a capacitor, and cooperating with said capacitor to form an LC filter circuit, wherein said choke coil includes first and second core type inductors having respectively bar-like high-frequency absorbing members located within windings thereof, an air-core inductor not having a high-frequency absorbing member and connected to said cathode terminal; said first core type inductor, said second core type inductor and said air-core inductor are connected in series, and; said first core type inductor and said second core type inductor are arranged via a gap having a width within 1 mm to 6 mm; wherein said high-frequency absorbing members located within said windings of said first and second core type inductors are connected via an insulating material located on a position corresponding to said gap presented between said first and the second core type inductors; wherein said insulating material is made of a silicone rubber based material.