Open AccessFour‐kilowatt homogeneous microwave heating system using a power‐controlled phase‐shifting mode for improved heating uniformity
Author(s) -
Jeong C.H.,
Ahn S.H.,
Lee W.S.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.0060
Subject(s) - microwave , materials science , cavity magnetron , microwave cavity , dielectric heating , power (physics) , phase (matter) , multi mode optical fiber , microwave heating , optoelectronics , optics , electrical engineering , dielectric , engineering , physics , optical fiber , telecommunications , thin film , quantum mechanics , sputtering , nanotechnology
For homogeneous microwave heating in a microwave cavity with multiple 2.45 GHz microwave generators, power‐controlled phase‐shifting mode is proposed in this Letter. The proposed microwave heating system consists of a multimode microwave cavity in which dielectric materials are placed to be heated, four phase‐shifting WR‐340 waveguides for different phase excitation, four 1 kW magnetrons that produce microwave power at 2.45 GHz, and a power supply with a system controller for the magnetron output power controls. Using the proposed power‐controlled phase‐shifting mode, uniform heating distribution is achieved by reducing the hot and cold spots in the microwave cavity. The proposed experiments demonstrated that in comparison to a conventional mode with simultaneous multiple inputs, the proposed mode can achieve an improved heating uniformity of ∼ 64.4 % .