Patent ID: 6246039
Filing Date: 2001-06-12
Classification: H05B,Y02B

Abstract:
A high frequency heating apparatus, comprising:a heating chamber for accommodating an object to be heated;high frequency heating means for generating microwaves to heat said object to be heated;a wave guide for introducing into said heating chamber the microwaves generated by said high frequency heating means, said wave guide including a first portion having one end connected to said high frequency heating means and in which impedance with regard to microwave propagation does not change, and a second portion connected to an other end of said first portion and to said heating chamber and in which impedance with regard to microwave propagation changes from impedance close to that of said first portion to impedance close to that of said heating chamber; anda metal antenna provided in every portion, in said wave guide, where rate of change in cross-sectional area of said wave guide in a direction of microwave propagation changes.