| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress the spurious radiation wave which is going to leak outside of the shield case of the input portion of magnetron. SOLUTION: The leakage control device comprises a shield case 6 with a metallic lid which surrounds an input portion 10a, 10b of magnetron, an input terminal 8a, 8b protruding to the outside of the shield case 6, a lead wire 12a, 12b which is connected respectively with the input terminals and the above input portion, and a conductive helical coil tube 13a, 13b surrounding each lead wire 12a, 12b through an insulating lead cover 14a, 14b. One end of these helical coil tubes 13a, 13b is fixed to the shield case 6 and the lead wires 12a, 12b are respectively made of one piece of continuous conductive line, thereby a coaxial line transfer mode is prevented from being formed between the lead wires and the helical coil tubes against the magnetic wave which may be radiated outside from inside the shield case. By this arrangement the leakage of spurious radiation wave to the outside of the shield case is effectively suppressed and the conventional choke coil containing ferrite and penetrating condenser are not required.
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