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- Non-radiative_dielectric_waveguide abstract "The non-radiative dielectric (NRD) waveguide has been introduced by Yoneyama in 1981. In Fig. 1 the cross section of NRD guide is shown: it consists of a dielectric rectangular slab of height a and width b, which is placed between two metallic parallel plates of suitable width. The structure is practically the same as the H waveguide, proposed by Tischer in 1953. Due to the dielectric slab, the electromagnetic field is confined in the vicinity of the dielectric region, whereas in the outside region, for suitable frequencies, the electromagnetic field decays exponentially. Therefore, if the metallic plates are sufficiently extended, the field is practically negligible at the end of the plates and therefore the situation does not greatly differ from the ideal case in which the plates are infinitely extended. The polarization of the electric field in the required mode is mainly parallel to the conductive walls. As it is known, if the electric field is parallel to the walls, the conduction losses decrease in the metallic walls at the increasing frequency, whereas, if the field is perpendicular to the walls, losses increase at the increasing frequency. Since the NRD waveguide has been deviced for its implementation at millimeter waves, the selected polarization minimizes the ohmic losses in the metallic walls.The essential difference between the H waveguide and the NRD guide is that in the latter the spacing between the metallic plates is less than half the wavelength in a vacuum, whereas in the H waveguide the spacing is greater. In fact the conduction losses in the metallic plates decrease at the increasing spacing. Therefore, this spacing is larger in the H waveguide, used as a transmission medium for long distances; instead, the NRD waveguide is used for millimeter wave integrated circuit applications in which very short distances are typical. Thus an increase in losses is not of great importance.The choice of a little spacing between the metallic plates has as a fundamental consequence that the required mode results below cut-off in the outside air-regions. In this way, any discontinuity, as a bend or a junction, is purely reactive. This permits radiation and interference to be minimized (hence the name of non-radiative guide); this fact is of vital importance in integrated circuit applications. Instead, in the case of the H waveguide, the above-mentioned discontinuities cause radiation and interference phenomena, as the desired mode, being above cutoff, can propagate towards the outside. In any case, it is important to notice that, if these discontinuities modify the symmetry of the structure with reference to the median horizontal plane, there is anyway radiation in the form of TEM mode in the parallel metallic plate guide and this mode results above cutoff, the distance between the plates may be no matter short. This aspect must always be considered in the design of the various components and junctions, and at the same time much attention has to be paid to the adherence of the dielectric slab to the metallic walls, because it is possible that the above-mentioned phenomena of losses are generated. This occurs when in general any asymmetry in the cross section transforms a confined mode into a "leaky" mode.".
- Non-radiative_dielectric_waveguide thumbnail Fig_1_guida_onda.JPG?width=300.
- Non-radiative_dielectric_waveguide wikiPageID "27738621".
- Non-radiative_dielectric_waveguide wikiPageLength "29878".
- Non-radiative_dielectric_waveguide wikiPageOutDegree "53".
- Non-radiative_dielectric_waveguide wikiPageRevisionID "646724553".
- Non-radiative_dielectric_waveguide wikiPageWikiLink 0_(number).
- Non-radiative_dielectric_waveguide wikiPageWikiLink Adhesion.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Aperture.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Asymmetry.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Bisection.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Category:Electrical_components.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Category:Electromagnetic_components.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Coefficient.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Cross_section_(geometry).
- Non-radiative_dielectric_waveguide wikiPageWikiLink Determinant.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Dielectric.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Dielectric_constant.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Dispersion_equation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Dispersion_relation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Electric_field.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Electromagnetic_field.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Equation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Evanescent_wave.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Extremely_high_frequency.
- Non-radiative_dielectric_waveguide wikiPageWikiLink File:Fig3_guida_onda_3.JPG.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Helmholtz_equation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Hendrik_Lorentz.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Homogeneous_system.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Horizontal_plane.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Integrated_circuit.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Interference_(wave_propagation).
- Non-radiative_dielectric_waveguide wikiPageWikiLink Magnetic_field.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Millimeter_wave.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Orthogonality.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Polarization_(waves).
- Non-radiative_dielectric_waveguide wikiPageWikiLink Polystyrene.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Propagation_constant.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Propagation_mode.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Radiation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Radio_propagation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Rectangular_waveguide.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Relative_permittivity.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Separability.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Separation_of_variables.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Short_circuit.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Standing_wave.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Superposition.
- Non-radiative_dielectric_waveguide wikiPageWikiLink System_of_linear_equations.
- Non-radiative_dielectric_waveguide wikiPageWikiLink TEM_mode.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Transcendental_equation.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Transmission_line.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Transmission_medium.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Transverse_mode.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Transverse_wave.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Vacuum.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Vector_potential.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Waveguide_(optics).
- Non-radiative_dielectric_waveguide wikiPageWikiLink Wavelength.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Wavenumber.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Wikt:configuration.
- Non-radiative_dielectric_waveguide wikiPageWikiLink Wikt:transverse.
- Non-radiative_dielectric_waveguide wikiPageWikiLink File:Fig_1_guida_onda.JPG.
- Non-radiative_dielectric_waveguide wikiPageWikiLink File:Fig_2_guida_onda.JPG.
- Non-radiative_dielectric_waveguide wikiPageWikiLink File:Fig_4_guida_onda.JPG.
- Non-radiative_dielectric_waveguide wikiPageWikiLinkText "Non-radiative dielectric waveguide".
- Non-radiative_dielectric_waveguide wikiPageWikiLinkText "non-radiative dielectric waveguide".
- Non-radiative_dielectric_waveguide hasPhotoCollection Non-radiative_dielectric_waveguide.
- Non-radiative_dielectric_waveguide wikiPageUsesTemplate Template:Disambiguation_needed.
- Non-radiative_dielectric_waveguide wikiPageUsesTemplate Template:Reflist.
- Non-radiative_dielectric_waveguide subject Category:Electrical_components.
- Non-radiative_dielectric_waveguide subject Category:Electromagnetic_components.
- Non-radiative_dielectric_waveguide type Component.
- Non-radiative_dielectric_waveguide type Electrodynamic.
- Non-radiative_dielectric_waveguide comment "The non-radiative dielectric (NRD) waveguide has been introduced by Yoneyama in 1981. In Fig. 1 the cross section of NRD guide is shown: it consists of a dielectric rectangular slab of height a and width b, which is placed between two metallic parallel plates of suitable width. The structure is practically the same as the H waveguide, proposed by Tischer in 1953.".
- Non-radiative_dielectric_waveguide label "Non-radiative dielectric waveguide".
- Non-radiative_dielectric_waveguide sameAs Guida_donda_dielettrica_non_radiativa.
- Non-radiative_dielectric_waveguide sameAs m.0cc9m5t.
- Non-radiative_dielectric_waveguide sameAs Q7048999.
- Non-radiative_dielectric_waveguide sameAs Q7048999.
- Non-radiative_dielectric_waveguide wasDerivedFrom Non-radiative_dielectric_waveguide?oldid=646724553.
- Non-radiative_dielectric_waveguide depiction Fig_1_guida_onda.JPG.
- Non-radiative_dielectric_waveguide isPrimaryTopicOf Non-radiative_dielectric_waveguide.