In this article we give the solution of Maxwell's equations for the open circular cylindrical magnetoactive semiconductor plasma (-gyrotropy) waveguides. We describe the method that allowed us to arrive at a dispersion equation for the electrodynamical analyses of open circular cylindrical plasma (OCCP) waveguides. We numerically investigate the main and two higher modes' dispersion characteristics of p-Ge and p-Si waveguides placed in an external constant longitudinal magnetic field at several concentrations of two component hole charge carriers. We analyse the cutoff frequency and other electrodynamical characteristics of helicon modes with the left-handed (e+iϕ) circular polarization. We discover that the cutoff frequencies of the main mode and the working frequency range of OCCP p-Ge and p-Si waveguides are moving continuously towards the direction of higher frequencies when the hole concentration is increasing. We determine that the central frequency of the p-Si plasma waveguide is higher and its broadbandwidth is larger compared with the analogical p-Ge waveguide. We also numerically investigate the helicon mode cutoff frequencies of the infinitive p-Ge and p-Si plasma at several concentrations of two component hole charge carriers. We compare the cutoff frequencies of the helicon modes propagating in the infinite plasma and in the OCCP waveguides.
In this paper the open cylindrical gyroelectric phase shifters characteristics are investigated. The investigation is performed by changing their parameters: the magnetic flux density, the number of layers of dielectric, width and permittivities. The highest differential phase shift in n-InAs semiconductor and semiconductor-dielectric phase shifters can be obtained in range of magnetic flux density from 0 to 0.25 T. The minimum attenuation in phase shifters is obtained with one external dielectric layer. Ill. 8, bibl. 6 (in English; abstracts in English and Lithuanian). V. Mališauskas, D. Plonis. Giroelektrinių n-InAs fazės keitiklių charakteristikų tyrimas // Elektronika ir elektrotechnika. -Kaunas: Technologija, 2012. -Nr. 6(122). -P. 121-124.Straipsnyje tiriamos atvirųjų cilindrinių giroelektrinių fazės keitiklių charakteristikos, keičiant jų parametrus: magnetinio srauto tankį, dielektrikų sluoksnių skaičių, storius ir dielektrines skvarbas. Nustatyta, kad n-InAs puslaidininkiniuose ir puslaidininkiniuosedielektriniuose fazės keitikliuose didžiausias diferencinis fazės pokytis gaunamas, kai magnetinio srauto tankis yra nuo 0 iki 0,25 T. Mažiausiai elektromagnetinės bangos slopinamos keitikliuose su vienu išorinio dielektriko sluoksniu. Il. 8, bibl. 6 (anglų kalba; santraukos anglų ir lietuvių k.).
This paper focuses on the analysis technique of gyrotropic circular cylindrical semiconductor waveguide by the use of an electrodynamical model. Authors propose the semi-automatic extraction of the dispersion characteristics by the use of single-layer perceptron neural network. The waveguide analysis algorithm consists of four main stages: initialization of system parameters, evaluation of transcendental linear dispersion equation system, extraction of dispersion characteristics and evaluation of the waveguide broad bandwidth. In this paper three types of waveguides (n-InP, n-InSb and p-InP) are analysed using a proposed algorithm. According to the results of analysis, the use of gyrotropic n-InP and p-InP semiconductor, semiconductor-dielectric waveguides are more preferred than to n-InSb waveguides due to their wider broad bandwidth.
The aim of this paper was to introduce the estimation of the losses in the prototypes of the microwave devices. We proposed in this paper two algorithms: an algorithm for evaluation of losses in the microwave devices based on a waveguide and an algorithm for evaluation of losses in the microwave devices based on a meander line. In order to verify the results of losses evaluation for the waveguide-based device, we have used the electrodynamic model of the open cylindrical gyrotropic waveguide with one anisotropic dielectric layer and the electrodynamic model of the open cylindrical gyrotropic waveguide with two dielectric layers. In order to verify the results of losses evaluation for the meander line-based device, we have used the model of the meander line with asymmetrical periodical inhomogeneity. The comparison of the losses evaluation results received by the algorithms proposed in this paper and the results received by application of the commercial software together with the alternative methods confirmed that the proposed algorithms produced correct results.
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