Ferroelectric Harmonic Generator and the Large‐Signal Microwave Characteristics of a Ferroelectric Ceramic
作者:
M. DiDomenico,
D. A. Johnson,
R. H. Pantell,
期刊:
Journal of Applied Physics
(AIP Available online 1962)
卷期:
Volume 33,
issue 5
页码: 1697-1706
ISSN:0021-8979
年代: 1962
DOI:10.1063/1.1728812
出版商: AIP
数据来源: AIP
摘要:
At microwave frequencies, ferroelectric ceramics behave as nonlinear dielectrics and exhibit large signal scalar nonlinear characteristics in both the dielectric constant and the rf conductivity. The nonlinear behavior of a ceramic of 73% BaTiO3‐27% SrTiO3has been used to construct a harmonic generator operating from 3 kMc to 9 kMc. An efficiency of 8.5% for a peak input power of 2200 w was attained. In addition, a new measurement technique has been developed for measuring the large signal properties of this ceramic as well as for other nonlinear materials. This technique makes explicit use of the anharmonic response of a resonant system that contains a nonlinear element. The analysis of both the harmonic generator and the nonlinear resonant system takes into account nonlinear reactance as well as nonlinear resistance. For temperatures about 30°C above the Curie temperature (the Curie temperature for the ceramic composed of 73% BaTiO3‐27% SrTiO3is approximately 20°C) the large signal dielectric constant and rf conductivity were found to be given by the expressions &egr;′(|E|)=&egr;0[2200−7.5×10−11|E|2] farad/m, and &sgr;(|E|) =&ohgr;&egr;0[160+29×10−12|E|2] mhos/m, where |E| is in volts per meter. These results were obtained at 3 kMc and are valid up to field strengths of 20 kv/cm.
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