Article
Analysis of Discontinuities in a Rectangular Waveguide Using Dyadic Green's Function Approach in Conjunction with Method of Moments
05/1997;
Source: NTRS
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 "The source element can be oriented along any direction, thus allowing to solve threedimensional current problems. In the spectral domain, the dyadic electric and magnetic Green's functions are expressed in terms of the normalized electric and magnetic TE and TM vector modal functions , as follows [Felsen and Marcuvitz, 1994; Wang, 1978; RahmatSamii, 1975; Deshpande, 1997] "
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ABSTRACT: A technique for the accurate computation of the time domain electromagnetic fields radiated by a charged distribution traveling along an arbitrarily shaped waveguide region is presented. Based on the transformation (by means of the standard Fourier analysis) of the timevarying current density of the analyzed problem to the frequency domain, the resulting equivalent current is further convolved with the dyadic electric and magnetic Green's functions. Moreover, we show that only the evaluation of the transverse magnetic modes of the structure is required for the calculation of fields radiated by particles traveling in the axial direction. Finally, frequency domain electric and magnetic fields are transformed back to the time domain, just obtaining the total fields radiated by the charged distribution. Furthermore, we present a method for the computation of the wakefields of arbitrary crosssection uniform waveguides from the resulting field expressions. Several examples of charged particles moving in the axial direction of such waveguides are included. 
 "Vertical posts placed in a rectangular waveguide are widely used for designing matching elements and filters. The scattering properties of the vertical posts are usually analyzed using numerical techniques such as the finite element method [1] and the method of moments [2]. A vertical full post from the top wall to the bottom wall across the narrower dimension of the guide can be regarded as a periodic array of parallel cylinders, being combined with its mirror images [3] with respect to two side walls. "
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ABSTRACT: Electromagnetic crystals formed by vertical full posts stacked in a rectangular waveguide are analyzed using the image theory and the lattice sums technique. It is shown that the frequency response of the crystals consisting of circular posts can be obtained by a simpler matrix calculus based on the onedimensional lattice sums, the Tmatrix of a circular cylinder in free space, and the generalized reflection and transmission matrices. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers. 
 "Vertical posts placed in a rectangular waveguide are widely used for designing matching elements and filters. The scattering properties of the vertical posts are usually analyzed using numerical techniques such as the finite element method [1] and the method of moments [2]. A vertical full post from the top wall to the bottom wall across the narrower dimension of the guide can be regarded as a periodic array of parallel cylinders, being combined with its mirror images [3] with respect to two side walls. "
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ABSTRACT: Electromagnetic bandgap structures formed by circular posts of magnetized ferrite stacked in a rectangular waveguide is analyzed using the image theory, the lattice sums technique, and the generalized reflection and transmission matrices. The frequency response controllable by the applied magnetic field are discussed for the incidence of the fundamental 10 TE mode.