Impedance Matching of a Coaxial Antenna for Microwave In-situ Processing of Polluted Soils

• Published in: The Journal of microwave power and electromagnetic energy Vol. 45; no. 2; pp. 70 - 78
• Main Authors: Pauli, Mario, Kayser, Thorsten, Wiesbeck, Werner, Komarov, Vyacheslav
• Format: Journal Article
• Language: English
• Published: United States Taylor & Francis 01.01.2011
• Subjects: coaxial antenna; complex dielectric permittivity; Decontamination - instrumentation; Electric Impedance; Equipment Design; Equipment Failure Analysis; FDTD modeling; Heating - instrumentation; in-situ soil remediation; microwave heating; Microwaves; reflection coefficient; soil; Soil Pollutants - isolation & purification; Soil Pollutants - radiation effects; Transducers
• ISSN: 0832-7823; 2472-4041
• DOI: 10.1080/08327823.2011.11689800

The present paper is focused on the minimization of return loss of a slotted coaxial radiator proposed for a decontamination system for soils contaminated by volatile or semivolatile organic compounds such as oils or fuels. The antenna upgrade is achieved by coating it with a 5 mm thick Teflon layer. The electromagnetic characteristics reflection coefficient and power density distribution around the antenna surrounded by soils with different moisture levels are analyzed numerically. Simplified analytical approaches are employed to accelerate the optimization of the given antenna for microwave heating systems. The improved antenna design shows a good matching of the antenna to the surrounding soil with varying moisture levels. This ensures a high efficiency of the proposed in-situ soil decontamination system.