Dielectric Characterization of Heterogeneous Composites Using Time Domain Spectroscopy and Microwave Test Benches in Microwave Frequency

Abstract

Dielectric composite materials made of polymers and ferroelectric ceramics have recently emerged as one of the important components for applications involving the generation, transformation, and storage of sustainable energy. Because there is a trade-off between dielectric permittivity, dielectric loss, and dissipation factor, the end use is the energy storage capacity. In the present study, epoxy resin (RE)/barium titanate (BaTiO3) composite samples are prepared using the mixture cast method with new molds. The dielectric properties, such as dielectric permittivity, dielectric loss, electrical modulus, static conductivity and dissipation factors due to the concentration of barium titanate and frequency effect on the composites, are examined using two characterization methods. The objective of this study is to determine the dielectric permittivity of the material using two microwave methods, the first is time domain spectroscopy (TDS) and the second is on the X-band microwave test bench (MTB). Additionally, different empirical mixture laws are used to estimate the dielectric permittivity of our composites. It is found that an increase in filler concentration (BaTiO3) increases the effective dielectric permittivity, which is confirmed with different empirical mixture models. The findings of this research can be used for electrical devices, including sensors, wave absorbers, resonators, and antennas.

Dielectric Behavior Characterization of RE/BaTiO3 Using Time Domain Spectroscopy: Application on High-Performance Dielectric Resonator Antennas

“…This apparatus requires, in addition to a digital acquisition system connected to a computer, an appropriate set of software to process and store experimental data in the time and frequency domain. [30][31][32] Fig. 2 depicts an illustration of such a system.…”

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

“…In the material family, oxides have attracted much attention due to their excellent mechanical properties, physical properties, and chemical properties [1,2] and, therefore, have been widely used in the field of optoelectronics, catalysis and electronics. In recent decades, the rapid development of wireless communications has made microwave dielectric ceramic devices with oxide components, such as duplexers, dielectric filters and multiplexers, a new research hotspot [3][4][5]. Moreover, low-temperature co-fired ceramic (LTCC) technology, which occupies a crucial role in the integration and miniaturization of multilayer devices, has become one of the dominant forms of fabricating electronic devices, and has raised the requirements for microwave dielectric ceramics.…”