WIDE BAND CHOKE DESIGN FOR SUPPRESSING ELECTROMAGNETIC LEAKAGE IN MICROWAVE OVENS

摘要

A microwave oven that consist of a cooking chamber, a door for opening and closing the chamber, the E-type choke structure that filter the electromagnetic leakage is placed inside the door frame and a transparent glass surface covering this structure. The E-type choke on the door has two parallel cavities, a periodic prism array that seperate the cavities and periodic slots on the outer side walls of the cavities. The new E-type choke structure produce two resonance frequencies that one of them is greater and the other one is smaller than the center frequency of the microwave oven. Thus, electromagnetic leakage can be filtered over a wide frequency range.

主权项

1. A microwave oven comprising
a body having a cooking chamber (2) having one opened side, a door (3) for opening and closing the cooking chamber, a transparant window surface with metal grate (4) placed on the door frame and has an ability to show inside the cooking chamber.Characterized in that it has
an E-type choke structure (6) comprising, two cavities (7, 8) seperated by the prsim array (9) and, periodic slots (10) on the inner sides of the side walls (11)that placed on the door frame of the oven and can filter electromagnetic leakage.