Journal of Microwave Power and Electromagnetic Energy (JMPEE)

 

TITLE

A New Applicator for Efficient Uniform Heating Using a Circular Cylindrical Geometry [PDF]

AUTHORS

J. Chang and M. Bodwin

1993

28

1

32-40

YEAR

VOLUME

ISSUE

PAGES

 

Abstract

A new multimode microwave applicator has been designed and constructed to provide efficient energy coupling and uniform heating of specimens at 2.45GHz.  The applicator is circular cylindrical with a diameter of 12.9 inches (32.8 cm) and a motorized endwall producing periodic variation of the cavity length between 7 inches (17.8 cm) and 12 inches (33.0 cm).  The positions of the endwall cause 19 distinct and identified modes to be scanned.  The close proximity of the resonant modes in this applicator as a function of the length of the applicator provides significant mode overlap in the presence of a load. The mode overlaps results in a constant input impedance as the length of the cavity changes.  Then input impedance of the applicator can therefore be matched over a range of different loads. 

 

Key Words:

Microwave oven, Dynamite multimode, Cylindrical geometry, Matched applicator, Uniform heating.