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Properties of NRD-guide and H-guide higher-order modes: physical and nonphysical ranges

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5 Author(s)
Di Nallo, Carlo ; Dipartimento di Ingegneria Elettronica, Rome Univ., Italy ; Frezza, F. ; Galli, A. ; Lampariello, P.
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New, interesting modal properties are presented for the waveguiding structure consisting of a rectangular-section dielectric rod sandwiched between parallel conducting plates, which can represent either a nonradiative dielectric (NRD) guide or an H guide. A rigorous quantitative analysis of the dispersion properties, making use of both wavenumber and steepest-descent plots, indicates that higher-order modes can show different anomalous behaviors, as geometrical and electromagnetic parameters vary. A discussion of the physical nature of the waves related to complex wavenumbers allows us to illuminate the performance differences between NRD and H-guides, as regards certain previously unexplored leakage effects

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:42 ,  Issue: 12 )