Cavity Perturbation Technique of 10-GHz Cylindrical Resonator for Measuring Dielectric Properties of Materials at Very High Temperatures
Abstract
Dielectric properties of candidate materials for hypersonic vehicle radomes, which can reach above 1,500xE; degrees Celsius, are required. Although there has been recent study for temperature dependence of dielectric constants, little is known near or above 1,500xE; degrees Celsius. Current research uses laboratory-sized furnaces to achieve these temperatures, but this also requires large-sized and expensive samples. To reduce these costs, this thesis modeled a rectangular waveguide aperture-coupled to a 1.016cm-height, 1.1415cm-radius cylindrical cavity designed to operate at a resonant frequency of 10GHz. It utilized the electromagnetic cavity-perturbation method to optimize the research of small dielectric disk samples. The objective was to model a much smaller system, produce an empirical relationship between cavity resonance and the sample's dielectric constant, and create a prototype of the design to validate this concept. It was found that a disk of 150 x16;microns thickness and small radius, positioned at the center of the cavity, is a viable geometry to produce sensitivity required to conduct dielectric measurements as a function of temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 23, 2017
- Accession Number
- AD1055061
Entities
People
- Marvin-ray Arida
Organizations
- Air Force Institute of Technology