Method for matching an adaptive hybrid to a line

US7167555B2 · kind B2 · utility

Assignee

• ALCATEL · FR

Inventors

• Tom Bostoen · Damme, BE
• Thierry Pollet · Mechelen, BE
• Patrick Jan Maria Boets · Heffen, BE
• Leonard Pierre Van Biesen · Aalst, BE

Key dates

• Filing date: Nov 19, 2004
• Grant date: Jan 23, 2007
• Expiry date: Jan 20, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R27/04
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Methods for matching adaptive hybrids (15) to lines (16) for making reflectograms of the lines (16) measure (1) input impedances (Zmeas) of the lines (16), model (2) characteristic impedances of the lines (16) via physical models (Zphymod), estimate (3) parameters of the physical models (Zphymod) via cost functions which depend on the measured input impedances (Zmeas), convert (30) the modelled characteristic impedances into impedance values (13), and set (31) the adaptive hybrids (15) with the impedance values (13). Unwanted near-end reflections are minimised and wanted reflections can be measured. The physical models depend on frequencies s, Bessel functions Ji and parameters ai related to geometrical dimensions A, D and L and material constants σ, ε and μ of the lines (16). The method may further model (6) characteristic impedances of the lines (16) via rational function models (Zrafumod) and estimate (7) parameters of the rational function models (Zrafumod) via further cost functions which depend on outcomes of the physical models (Zphymod).