Tunability Behavior of (Ba, Ca)(Zr, Ti)O-3 Ceramic Capacitors Powered by Thermally Induced Phase Transitions With Applications to Nonlinear Transmission Lines

Autor(es)

Aredes, Rangel Graudiston ; Antonelli, Eduardo ; Silva Neto, Lauro P. ; Rossi, Jose O. ; Schamiloglu, Edl

• Tipo de documento: Artigo Científico
• Fonte: IEEE TRANSACTIONS ON PLASMA SCIENCE; v. N/A, p. 8-pg., 2022-05-12.

Resumo

Ferroelectric ceramics with low loss dielectric, high permittivity, and nonlinear behavior are essential in capacitive nonlinear transmission lines (NLTLs) for radio frequency (RF) generation. NLTLs have the potential to generate soliton waves for high-power microwave (HPM) applications in mobile defense platforms and satellite communications. In this work, we synthesize, characterize, and investigate the nonlinear behavior of (Ba,Ca)(Zr,Ti)O-3 ceramics system to be applied as nonlinear elements in capacitive NLTLs. The ceramics were structurally and microstructural characterized. Anomalies in dielectric and pyroelectric curves access the temperatures of phase transitions. The permittivity tunability was studied as a function of electric field and frequency in temperatures near phase transitions. The phase transitions of materials are identified by temperature where the permittivity and percentage of nonlinear tunability factor (NTF) are higher, which are required to produce RF on NLTLs. (AU)

• Processo FAPESP: 18/26086-2 - Geração de radiofrequência usando linhas de transmissão não lineares giromagnéticas para aplicações aeroespaciais
• Beneficiário: José Osvaldo Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/04395-3 - Sinterização e caracterização de cerâmicas dielétricas de alta permissividade do tipo BZT-BaTiZrO3 e BST - BaTiSrO3 para aplicações em linhas de transmissões não lineares
• Beneficiário: Lauro Paulo da Silva Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular