MICROWAVE PROCESSING APPARATUS

摘要

A microwave oven (20), provided with a waveguide (3) having an E-bend structure, and a plurality of openings (4a, 4b). The waveguide (3) has a first portion (3a) for propagating microwaves from a magnetron (2) to a heating chamber (1) and a second portion (3b) having a broad surface in contact with the outside of the heating chamber (1). The openings (4a, 4b) are provided on a side surface of the heating chamber (1) so that the waveguide (3) and the heating chamber (1) communicate, and have at least one -polarized-wave opening (4a) for generating circularly polarized waves. The circularly-polarized-wave opening (4a) is provided so that the center thereof is outside of a cross-section projection region (3c) demarcated by causing the cross-section of the first portion (3a) orthogonal to a tube axis (7a) of the first portion (3a) to be virtually projected along the tube axis (7a) of the first portion (3a) onto the side surface of the heating chamber (1). This configuration ensures circularly polarized waves can be generated using a compact waveguide.