Electromagnetic field distribution adjusting device, control method therefor, and microwave heating device

摘要

The electromagnetic field distribution adjusting device (5) includes a ground conductor (14) provided along a predetermined two-dimensional region, and a plurality of metal pieces (11) periodically arranged two-dimensionally along the ground conductor (14). ), A plurality of short-circuit conductors (13) respectively connecting the plurality of metal pieces (11) to the ground conductor (14), and two metals adjacent to each other at least part of the plurality of metal pieces (11) And a plurality of switches (12) provided between the pieces. The electromagnetic field distribution adjusting device (5) has different impedances for electromagnetic waves having a predetermined frequency in accordance with opening and closing of the switch. Thereby, the heating nonuniformity of the to-be-heated material which arises when carrying out microwave heating can be reduced.