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Title: A microwave applicator for uniform irradiation by circularly polarized waves in an anechoic chamber

Microwave applicators are widely employed for materials heating in scientific research and industrial applications, such as food processing, wood drying, ceramic sintering, chemical synthesis, waste treatment, and insect control. For the majority of microwave applicators, materials are heated in the standing waves of a resonant cavity, which can be highly efficient in energy consumption, but often lacks the field uniformity and controllability required for a scientific study. Here, we report a microwave applicator for rapid heating of small samples by highly uniform irradiation. It features an anechoic chamber, a 24-GHz microwave source, and a linear-to-circular polarization converter. With a rather low energy efficiency, such an applicator functions mainly as a research tool. This paper discusses the significance of its special features and describes the structure, in situ diagnostic tools, calculated and measured field patterns, and a preliminary heating test of the overall system.
Authors:
; ; ; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. Department of Physics, National Taiwan University, Taipei, Taiwan (China)
  2. Department of Entomology, National Taiwan University, Taipei, Taiwan (China)
  3. Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei, Taiwan (China)
Publication Date:
OSTI Identifier:
22314666
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CAVITY RESONATORS; DRYING; ENERGY CONSUMPTION; ENERGY EFFICIENCY; FOOD PROCESSING; GHZ RANGE; HEATING; MICROWAVE RADIATION; PEST CONTROL; POLARIZATION; SINTERING; STANDING WAVES; SYNTHESIS; WASTE PROCESSING