Control of Microwave Heating in Rectangular Waveguide and Rectangular Cavity

矩形波导和矩形腔内微波加热的控制

基本信息

批准号：
15560176
负责人：
AOKI Kazuo
金额：
$ 2.24万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560176/
关键词：
Microwave heating Rectangular waveguide Cavity Electromagnetic field Interference Optimum condition 導波管

项目摘要

Microwave heating has the features in a transmission, absorption and reflection of an electromagnetic wave. The performance of the heating strongly depends on the interference of the transmitted wave and reflected wave in materials. Using the microwave of TE_<10> mode and frequency of 2.45GHz in a rectangular waveguide and a rectangular cavity, we have investigated two effects of a reflecting plate and an incident wave control plate on the characteristics of microwave heating.The results obtained here are summarized as follows ;(1) In the normal case without the reflecting plate, the quantity of heat generation has peaks at the resonance states, corresponding to the integer multiple of half wavelength of the sample. The quantity of heat generation increases when a reflecting plate is installed in the best position. However, as the sample length becomes longer, the effect of a reflecting plate becomes smaller because of a damping of microwave.(2) In order to avoid the reflection on the surface of the sample, it is available to attach a low dielectric material on the sample. By attaching the wave control plate having the optimum relative permittivity and having a quarter wavelength in thickness, the quantity of heat generation increases, comparing with the normal heating.(3) In order to clarify the optimization of microwave heating in a rectangular waveguide, we proposed two procedures attaching a reflecting plate and an incident wave control plate to the sample and indicated the guideline for the optimization of microwave heating by controlling reflected and transmitted waves.(4) For microwave heating in a rectangular cavity, we similarly proposed two procedures attaching a reflecting plate and an incident wave control plate to the sample and indicated the guideline for the optimization of microwave heating by controlling reflected and transmitted waves.

微波加热具有电磁波的透射、吸收和反射的特点。加热性能很大程度上取决于材料中透射波和反射波的干涉。利用矩形波导和矩形腔内的TE_<10>模式、频率为2.45GHz的微波，研究了反射板和入射波控制板对微波加热特性的两种影响。得到的结果为总结如下：(1)在没有反射板的正常情况下，发热量在谐振态处出现峰值，对应于样品半波长的整数倍。当反射板安装在最佳位置时，发热量会增加。但随着样品长度变长，由于微波的阻尼，反射板的作用会变小。 (2)为了避免样品表面的反射，可以在样品表面贴附低介电材料。样品。通过安装具有最佳相对介电常数且厚度为四分之一波长的波控制板，与正常加热相比，发热量增加。（3）为了阐明矩形波导中微波加热的优化，我们提出了将反射板和入射波控制板附加到样品上的两种程序，并为通过控制反射波和透射波来优化微波加热提供了指导。（4）对于矩形腔体中的微波加热，我们同样提出了两种附加程序反射板和入射波控制板样品并指出了通过控制反射波和透射波来优化微波加热的指南。