Intermodulation Distortion in Coupled-Resonator Filters with Non-Uniform Distributed Nonlinear Properties: Use in HTS IMD Compensation

Published

April 1, 2007

Author(s)

Jordi Mateu, James Booth, Carlos Collado, David Seron, Juan M. O'Callaghan

Abstract

This work presents a general procedure for calculating intermodulation distortion in coupled-resonator filters with non-uniform distributed nonlinear properties. This procedure allows to predict the nonlinear performance of a nonlinear filter as a function of the general nodal matrix defining the filter and the material parameters which cause the nonlinear behavior. It is valid for almost any type of nonlinear distributed effects, including those produced by superconductors, nonlinear dielectrics such as ferroelectrics, or superconductor/ferroelectric bilayers. The procedure has been validated with experimental measurements in an eight-pole quasi-elliptic superconducting filter. Using this procedure we have assessed the combination of materials with different types of nonlinear effects to partially or completely mitigate the filter nonlinear response. This includes superconducting filters with a ferroelectric pre-distorter stage, post-distorter stage, or even with intermediate ferroelectric compensation stages.

Citation

IEEE Transactions on Microwave Theory and Techniques

Volume

55

Issue

4

Pub Type

Journals

Keywords

Superconducting Filters, Ferroelectrics, intermodulation products, nonlinearities, harmonic balance, nonlinear measurements.

Citation

Mateu, J. , Booth, J. , Collado, C. , Seron, D. and O'Callaghan, J. (2007), Intermodulation Distortion in Coupled-Resonator Filters with Non-Uniform Distributed Nonlinear Properties: Use in HTS IMD Compensation, IEEE Transactions on Microwave Theory and Techniques (Accessed October 11, 2025)