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Analysis and Simulation of distributed nonlinearities in ferroelectrics and superconductors for microwave applications

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4 Author(s)
Seron, D. ; Dept. de Teoria de la Senal y Comunicaciones, Univ. Politecnica de Catalunya, Barcelona, Spain ; Collado, C. ; Mateu, J. ; O'Callaghan, J.M.

This paper gives closed-form equations for the intermodulation and third harmonic signals generated in a nonlinear transmission line with distributed quadratic nonlinearities in the conductor and dielectric. Although the formulation developed is general, it is intended to be used in planar devices combining high-temperature superconductor (HTS) and oxide ferroelectrics. The analysis in this paper shows that the intermodulation and third harmonic signals produced by an HTS tend to cancel those of a ferroelectric, and that full cancellation is theoretically possible. This opens the way for using HTS/ferroelectric multilayers, not (only) for their tunable or phase-shifting properties, but for highly linear spurious-free planar HTS devices.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 3 )