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A broadband variable-temperature test system for complex permittivity measurements of solid and powder materials
Yunpeng Zhang1, En Li1, Jing Zhang1
1School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
The Review of Scientific Instruments
|March 3, 2018
Summary
A new microwave test system accurately measures material complex permittivity up to 1500°C. This reliable system uses a multi-mode cavity and separate heating/testing areas for precise temperature-dependent dielectric analysis.
Area of Science:
- Materials Science
- Electromagnetics
- Microwave Engineering
Background:
- Accurate measurement of complex permittivity is crucial for understanding material dielectric properties.
- Existing methods often face challenges with high temperatures and material types (solid/powder).
- Temperature-dependent dielectric analysis requires specialized, stable measurement systems.
Purpose of the Study:
- To develop and validate a novel microwave test system for measuring complex permittivity of solids and powders.
- To enable accurate dielectric measurements as a function of temperature up to 1500 °C.
- To address limitations of traditional methods, particularly regarding purity of test modes and temperature control.
Main Methods:
- Utilized a TM0n0 multi-mode cylindrical cavity with a slotting structure for enhanced mode purity.
- Implemented separate heating and testing zones with sample transfer via an Alundum tube for safety and efficiency.
- Employed induction heating and a pneumatic platform for rapid temperature control.
- Integrated a vector network analyzer with single trigger function to stabilize resonance peaks.
- Applied a rigorous field theoretical solution for complex permittivity calculation, accounting for multilayer media and cavity radius variations.
- Developed a temperature-dependent calibration method for sample holders (Alundum tube, quartz vial).
Main Results:
- The developed system demonstrated reliable and accurate measurement of complex permittivity for various materials.
- Variable-temperature tests up to 1500 °C on fused quartz and SiO2 powder showed good agreement with published data.
- System stability was confirmed through repeated and long-term tests.
- Error analysis provided an estimation of uncertainties from different error sources.
Conclusions:
- The novel microwave test system is effective for precise, temperature-dependent complex permittivity measurements of solid and powder materials.
- The system's design, incorporating a multi-mode cavity and advanced temperature control, overcomes previous limitations.
- The validated system offers a reliable tool for materials research and development requiring high-temperature dielectric characterization.
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