Accession Number : ADP007779

Title :   A Wide Range Tunable and Matchable High Temperature Applicator,

Corporate Author : ALBERTA UNIV EDMONTON DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Tian, B. Q. ; Tinga, W. R.

Report Date : 27 APR 1992

Pagination or Media Count : 8

Abstract : Tuning and matching is vital for a resonant microwave material processing applicator. A wide range tunable and matchable, resonant, high temperature, microwave applicator is proposed consisting of a coaxial cavity with a gap cutting its center conductor. It can be tuned and matched for different gap loads, ranging from air to water, by adjusting two non-contact short circuit plungers. This scheme varies the internal impedance or energy storage in contrast to using external tuning reactances. A simple, analytic, lumped parameter circuit is obtained for an arbitrarily positioned gap in the center conductor using an artificial electric wall concept. Based on this, an equivalent circuit model is built to characterize the internal tuning and matching mechanism. As an application example, 3 mm and 5 mm diameter mullite. rods were joined successfully, without an intermediary, using less than 60 W of microwave power at 915 MHz for 10 minutes.

Descriptors :   *CAVITY RESONATORS, *TUNED CIRCUITS, *CERAMIC MATERIALS, AIR, APPLICATORS, CAVITIES, CIRCUITS, DIAMETERS, ENERGY, ENERGY STORAGE, EQUIVALENT CIRCUITS, HIGH TEMPERATURE, IMPEDANCE, MATCHING, MATERIALS, MICROWAVES, MODELS, POWER, PROCESSING, RODS, SHORT CIRCUITS, TEMPERATURE, TUNING, WATER, RESONANCE, RESONANT FREQUENCY, JOINING, REFLECTION, SYMPOSIA.

Subject Categories : Ceramics, Refractories and Glass
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE