Journal of Microwave Power and Electromagnetic Energy (JMPEE)

 

TITLE

Rapid Feasibility Tests Using a TE10n Variable Aperture Resonant Applicator [PDF]

AUTHORS

A.C. Metaxas

1990

25

1

16-24

YEAR

VOLUME

ISSUE

PAGES

 

Abstract

A variable-aperture, variable-plunger microwave resonant cavity has been characterized using slotted line techniques for processing a wide range of different materials at 2,450 MHz. Data for the voltage standing wave ratio, S, as a func­tion of the cavity length and frequency, as well as heating rates using a 1.5 kW test source, are presented.  Initial heati­ng rates in particulates in the range 0.4°Cls to 20°Cls were observed. Temperatures close to 650ºC have been reached in ceramic compounds within a few minutes. The limiting factor of reaching 1000°C, a requirement for the ceramic compounds to attain the superconducting phases, is thermal radiation loss from the heated samples. Plasmas at sub-at­mospheric pressures were readily obtained with this appli­cator.

 

KeyWords:

Microwave heating, Resonant cavity, Variable aperture sus­ceptance, Voltage standing wave ratio, Slotted line tech­niques, Heating rates, Particulate, Superconducting ceramic powders, Microwave plasmas, Infrared thermography.