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• W2138685284 abstract "In the above paper’ an application of the finite element method to the computation of scattering parameters of dielectric resonator structures is presented. Exiting possibilities of analyzing the whole filter structure (including input and output structures) seems to be the main advantage of the finite element method over other analysis methods. But presented results indicate that the accuracy of computation is the main problem in the finite element method. Two section of the paper need close scrutiny. In Figs. 5 and 6 the results of the analysis of two transversely coupled dielectric resonators are presented. The structure is shown in Fig. 4. The resonant frequencies of the even and odd mode are too high. Lets consider the resonant frequency of the even mode, which is the resonant frequency of a half of the structure from Fig. 4 with a metal wall placed exactly in the symmetry plane. The distances between the dielectric resonator and walls are as follows: 6 mm, 6 mm, 6 mm and 3 mm. It is clear that the resonant frequency of this structure must be higher that the resonant frequency fcl of the cylindrical structure with the extemal diameter Dextl equal to 4- mm and lower than the resonant frequency fc2 of the cylindrical structure with the extemal diameter DextZ equal to 9 mm. Computed by means of the radial mode matching method [I]-[3] resonant frequencies of the cylindrical structures are presented in Table I. The discrepancy between results is so big that dimensions given in Fig. 4 or the accuracy of the finite element method are in doubt. In Table I The resonant frequency f~f~l of the cylindrical resonator in the box was calculated by means of the mode matching method in which the series of radial waveguide modes is matched with the series of rectangular waveguide modes. The second section of the paper that need to be considered describes the application of the 3-D finite element method to the computation of resonant frequencies of hybrid modes. Presented results have a little in common with the structure described in Fig. 18. In Table I1 the results of computation of the resonant frequencies of the structure from Fig. 18 are presented. The radial mode matching method have been used [1]-[3] to verify the accuracy of the finite element method. This time the discrepancy is so big that can be explained only as printing mistake. It is possible that a radius of the dielectric resonator stated in Fig. 18 as 17 mm in fact is equal to 11 mm (such a radius have resonators used in the filter presented in the paper). That is why in Table I1 there are presented results computed for two radii. Presented results raise a question on the accuracy of the finite element method applied to the dielectric resonator structures." @default.
• W2138685284 created "2016-06-24" @default.
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• W2138685284 date "1993-01-01" @default.
• W2138685284 modified "2023-09-24" @default.
• W2138685284 title "Comments on Finite Elements for Microwave Device Simulation: Application to Microwave Dielectric Resonator Filter" @default.
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