Corrugated waveguide mode content analysis using irradiance moments

Sudheer K. Jawla, Michael A. Shapiro, Hiroshi Idei, Richard J. Temkin

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We present a novel, relatively simple method for determining the mode content of the linearly polarized modes of a corrugated waveguide using the moments of the intensity pattern of the field radiated from the end of the waveguide. This irradiance moment method is based on calculating the low-order irradiance moments, using measured intensity profiles only, of the radiated field from the waveguide aperture. Unlike the phase retrieval method, this method does not use or determine the phase distribution at the waveguide aperture. The new method was benchmarked numerically by comparison with sample mode mixtures. The results predict less than ±0.7% error bar in the retrieval of the mode content. The method was also tested using high-resolution experimental data from beams radiated from 63.5 mm and 19 mm corrugated waveguides at 170 and 250 GHz, respectively. The results showed a very good agreement of the mode content retrieved using the irradiance moment method versus the phase retrieval technique. The irradiance moment method is most suitable for cases where the modal power is primarily in the fundamental HE 11mode, with <8% of the power in high-order modes.

    Original languageEnglish
    Article number6891353
    Pages (from-to)3358-3364
    Number of pages7
    JournalIEEE Transactions on Plasma Science
    Volume42
    Issue number10
    DOIs
    Publication statusPublished - Oct 1 2014

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

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