Journal of Communications Technology and Electronics

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Analysis of a horn-lens TEM antenna
Journal of Communications Technology and Electronics - Tập 57 - Trang 1031-1038 - 2012
N. A. Efimova, V. A. Kaloshin, E. A. Skorodumova
Matching and radiation characteristics of a horn-lens TEM antenna are studied theoretically and experimentally in an ultra-wide frequency band. Theoretical results are obtained by means of electromagnetic modeling on the basis of the finite-element method. Antennas with different geometries of the lens and different methods of excitation of the TEM horn are considered. Direct excitation by a coaxi...... hiện toàn bộ
Distributed Coupling of EBG-Waveguides with a Sparse Lattice of Coupling Elements
Journal of Communications Technology and Electronics - Tập 66 - Trang 551-555 - 2021
S. E. Bankov, V. I. Kalinichev
Eigenwaves in the structure of coupled EBG waveguides with a sparse lattice of coupling elements, as well as characteristics of directional couplers based on them, are investigated. The propagation constants of even and odd waves in a system of two coupled triple waveguides the common wall of which is a sparse lattice of metal cylinders with a period twice the period of the crystal. It is shown th...... hiện toàn bộ
Classification of Breast Abnormalities Using a Deep Convolutional Neural Network and Transfer Learning
Journal of Communications Technology and Electronics - Tập 66 - Trang 778-783 - 2021
A. N. Ruchai, V. I. Kober, K. A. Dorofeev, V. N. Karnaukhov, M. G. Mozerov
A new algorithm for classification of breast pathologies in digital mammography using a convolutional neural network and transfer learning is proposed. The following pretrained neural networks were chosen: MobileNetV2, InceptionResNetV2, Xception, and ResNetV2. All mammographic images were pre-processed to improve classification reliability. Transfer training was carried out using additional data ...... hiện toàn bộ
Isolated-word segmentation based on the dynamics of the parameters of short correlation functions
Journal of Communications Technology and Electronics - - 2006
V. E. Antsiperov, В. А. Морозов, С. А. Никитов
Structure and thermomechanical properties of fast-quenched Ti2NiCu alloy ribbons with various crystalline phase fractions obtained by means of annealing by electric current
Journal of Communications Technology and Electronics - - 2017
A. N. Akbasheva, А. В. Иржак, V. V. Istomin-Kastrovskii, V. V. Koledov, Д. С. Кучин, П. В. Лега, N. Yu. Tabachkova, В. Г. Шавров, A. V. Shelyakov
Dao động được điều khiển trong một hệ thống có độ trễ khi có sự hiện diện của tác động tham số và tự tham số Dịch bởi AI
Journal of Communications Technology and Electronics - Tập 53 - Trang 1412-1417 - 2008
E. V. Kal’yanov
Các mô hình mới của một bộ dao động có độ trễ dựa trên một bộ dao động phi điều hòa với một lực phục hồi phi tuyến. Các chế độ điều khiển dao động tham số và tự tham số được xem xét. Phân tích số được sử dụng để chứng minh sự kích thích hỗn loạn phát triển ở một phi tuyến tính tương đối yếu của đặc trưng biên độ.
#dao động có độ trễ #lực phục hồi phi tuyến #điều khiển dao động tham số #phân tích số #hỗn loạn
Calculation of the propagation constants of inhomogeneous nonlinear double-layer circular cylindrical waveguide by means of the Cauchy problem method
Journal of Communications Technology and Electronics - Tập 58 - Trang 762-769 - 2013
D. V. Valovik, E. Yu. Smol’kin
The problem of propagation of surface TM electromagnetic waves in an inhomogeneous Kerrnonlinear double-layer circular cylindrical waveguide is considered. It is shown that determination of the propagation constants of the considered waves is a a nonlinear conjugation eigenvalue problem for a system of two ordinary differential equations. A numerical method is proposed for determination of the pro...... hiện toàn bộ
Analysis of a waveguide array with semitransparent walls for formation of flat-topped partial patterns
Journal of Communications Technology and Electronics - Tập 56 - Trang 249-258 - 2011
S. P. Skobelev
A complete 2D mathematical model of an array of single-mode waveguides containing waveguide sections with semitransparent walls, which were proposed earlier for formation of flat-topped partial patterns, is developed. The semitransparent walls are formed from rows of cylindrical conductors. The model is constructed on the basis of the method of projection matching of the fields in the apertures of...... hiện toàn bộ
Method for Autoregression Modeling of a Speech Signal Using the Envelope of the Schuster Periodogram as a Reference Spectral Sample
Journal of Communications Technology and Electronics - Tập 68 - Trang 128-134 - 2023
V. V. Savchenko
The problem of autoregressive modeling of a speech signal based on the data of the discrete Fourier transform in the mode of a sliding window of small duration (milliseconds) is considered. The problem of stability of the formed autoregressive model is investigated. To overcome it, it is proposed to use the envelope of the Schuster periodogram as a reference spectral sample. A new method of autore...... hiện toàn bộ
Optimization of a combined high-power ultrawideband antenna
Journal of Communications Technology and Electronics - Tập 62 - Trang 976-983 - 2017
Yu. A. Andreev, V. N. Kornienko, Sh. Liu
The results of optimization of the geometry of a combined ultrawideband antenna excited by a 1-ns bipolar pulse are presented. Numerical and physical experiments have been performed to optimize the increase in the electric-field strength in the direction of the antenna main beam. It has been shown that the peak field strength can be increased by 6%.
Tổng số: 2,358   
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