RegisterModes, mode numbers, dominant mode, band of unimodalityWaves propagating in a waveguide are characterized by a given transversal field distribution. The wave of a given transversal field distribution is denoted as a given mode of a wave. Every mode can be characterized by a given critical frequency, a given phase velocity, a given wavelength and a given group velocity. The mode of the lowest critical frequency is called the dominant mode. The frequency band, in which a single mode of a wave propagates in the waveguide, is called the band of unimodality. Every mode is characterized by integer constants. Those constants are called mode numbers. Considering rectangular waveguide, mode numbers specify the number of half-waves of standing waves in the directions of transversal coordinates. E.g. TM11 (transversal magnetic wave) is of a single half-wave of the longitudinal component of electric field intensity in x and a single half-wave in y (if z is identical with waveguide axis). Considering TE10 (transversal electric wave, the dominant mode of a rectangular waveguide), a single half-wave of the longitudinal component of magnetic field intensity appears in x, and in y , this component is constant. Back
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