Wavelet filtered modelling applied to measurements of a waveguide's THz time domain response

Sillas Hadjiloucas, R. K. H. Galvao, Victor Manuel Becerra, John Wesley Bowen, R. Martini, M. Brucherseifer, H. P. M. Pellemans, P. H. Bolivar, H. Kurz, J. M. Chamberlain

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    A quasi-optical de-embedding technique for characterizing waveguides is demonstrated using wideband time-resolved terahertz spectroscopy. A transfer function representation is adopted for the description of the signal in the input and output port of the waveguides. The time domain responses were discretised and the waveguide transfer function was obtained through a parametric approach in the z-domain after describing the system with an ARX as well as with a state space model. Prior to the identification procedure, filtering was performed in the wavelet domain to minimize signal distortion and the noise propagating in the ARX and subspace models. The model identification procedure requires isolation of the phase delay in the structure and therefore the time-domain signatures must be firstly aligned with respect to each other before they are compared. An initial estimate of the number of propagating modes was provided by comparing the measured phase delay in the structure with theoretical calculations that take into account the physical dimensions of the waveguide. Models derived from measurements of THz transients in a precision WR-8 waveguide adjustable short will be presented.
    Original languageEnglish
    Title of host publicationIEEE 10th International Conference on Terahertz Electronics (THz 2002)
    Place of PublicationPiscataway
    PublisherIEEE
    Pages129-132
    ISBN (Print)0780376307
    DOIs
    Publication statusPublished - 2003

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