Characterization of Ceramic Dielectrics for Sub-GHz Applications in Nonlinear Transmission Lines

• Published in: IEEE transactions on plasma science Vol. 42; no. 10; pp. 3274 - 3282
• Main Authors: Silva Neto, Lauro P., Rossi, Jose Osvaldo, Barroso, Joaquim J., Silva, Ataide R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Barium titanates; Capacitance; Capacitors; Ceramics; Chemical compounds; Condensers; Dielectric constant; Dielectric losses; Dielectric permittivity; Dielectrics; Electricity distribution; Electricity generation; ferroelectric ceramics; Lead zirconate titanates; loss tangent; microwave generation; nonlinear transmission lines; Nonlinearity; Permittivity; Resonant frequency; solitons; Transmission lines; ferroelectric ceramics; microwave generation; nonlinear transmission lines; Dielectric permittivity; loss tangent; solitons
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2014.2307921

Low loss dielectric materials with high permittivity and nonlinear behavior are essential for use in capacitive nonlinear transmission lines (NLTLs) for RF generation. NLTLs have a great potential to generate soliton waves for high-power microwave applications in mobile defense platforms and satellite communications. In this paper, the dielectric properties of a piezoelectric capacitor based on lead-zirconate-titanate (PZT) was characterized in a broadband frequency range from 10 MHz to 1 GHz for use in NLTLs. Three commercial ceramic capacitors made of barium titanate (BaTiO 3 ) were also assessed for comparison with the PZT capacitor. The characterization of materials consisted of measuring the relative dielectric constant (real and imaginary parts) as function of the applied voltage and frequency to calculate the loss tangent of the material. The results showed that PZT material has a better performance for use in NLTLs than barium titanate because of its lower losses. As discussed here, however, the use of PZT and barium titanate-based materials in NLTLs are compromised by the self-resonant frequency of the capacitors because of the inherent parasitic inductance associated with the capacitor at high frequencies.