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A modal finite‐difference time‐domain (FDTD) method is extended for the analysis of ridged cavities, which are uniform in the z‐direction. Assuming that the end surfaces of cavity are the perfect conductor, thus, the fields along the z‐axis can be described by kz. Therefore, three‐dimensional (3‐D) problems can be simulated by the use of a two‐dimensional model. Besides, to achieve a faster computation,...
Accurate analysis of inhomogeneously filled cavities by vector finite element method (VFEM) is presented in this paper. A generalized theory is presented and a tetrahedral subdivision element is exerted for the analysis of inhomogeneously loaded cavities. As a validation, the resonant frequencies of the rectangular and cylindrical cavities filled with dielectric of different types are computed and...
Based on two inequalities, the upper and lower bounds of the cutoff wavenumber of the lowest-order TM mode of a pentagonal waveguide family are derived. By means of taking the geometric mean value, an approximate formula to calculate the cutoff wavenumber of the lowest-order TM mode of a pentagonal waveguide family is developed. It is the function of the cross section geometric parameters of the pentagonal...
The finite-difference time-domain (FDTD) method is applied to analyzing the influence of the ridge position on the cutoff wavelength and bandwidth of the dominant mode in the ridge waveguide. The cutoff wavelength and bandwidth of the dominant mode of the asymmetrical single- and double-ridge rectangular waveguide have been analyzed. Numerical results demonstrate that FD-TD method is precise and efficient,...
An accurate and stable method, the combination of finite-difference time-domain technique, fast Fourier transform, Padé approximation, and sum algorithm, is presented for the calculation of the quality factors of cavity. Comparing with the fast Fourier transformation/Padé technique, without missing any interesting mode, this novel method not only eliminates the sensitivity of Padé approximation but...
An efficient two-dimensional (2-D) finite-difference time-domain (FDTD) method is presented for the analysis of parallel-plate dielectric resonator. Three-dimensional (3-D) electromagnetic problems, with the description of -dependence by , can be solved by compact 2-D FDTD method. Moreover, the perfect matched layer (PML), corresponding to the proposed FDTD algorithm, is also presented for the...
An efficient technique using the fast Fourier transform, sum algorithm in combination with the finite-difference time-domain (FDTD) method is proposed for the full-wave analysis of fin-line. In modelling the fin-line, substrate dielectric is treated as a complex permittivity dielectric. Cut-off wavelength, effective dielectric constant, propagation constant and attenuation constant are presented....
The subregion solution of multipole theory(MT) is presented as a new approach for the analysis of propagation characteristics of a ridge waveguide family. The complicated field domain not satisfying the MT series expansion condition is treated as a combination of several simple field regions satisfying the MT series expansion condition, and the solution of the governing partial differential equation...
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