


Vol 70, No 3 (2025)
ОБЗОР
VORTEX ELECTROMAGNETIC WAVES: RADIATION, RECEIVING, PERSPECTIVES OF APPLICATION
Abstract
A review of achievements in the field of research of electromagnetic waves with spiral phase front and their applications is presented. Known methods of radiation and receiving of such waves are considered, as well as their application to increase the efficiency of frequency spectrum use in radio communication systems due to simultaneous transmission of signals on several vortex modes with different angular indices, to improve the performance of radar systems with synthetic aperture by obtaining additional information, methods of reducing backscattering of radar objects. The ways of further research are discussed.



СТАТИСТИЧЕСКАЯ РАДИОФИЗИКА
A method for calculating errors in measuring the angular coordinates of a radar target presented as a multipoint model
Abstract
The problem of determining errors in measuring angular coordinates (angular noise) of a radar target presented as a multipoint model is considered. A method for calculating errors in the angular coordinates of targets is proposed, which is based on determining the gradient of the phase field of the wave at the point of reception of reflected signals. Analytical relations have been obtained that make it possible to calculate the direction of arrival of waves with an arbitrary number and location of points in a multipoint target model. For various types of targets — low-flying, group and single targets with a different number of points, calculations of errors in the angles of arrival of radio waves were carried out. In this case, angular errors are understood as the deviation of the direction of arrival of reflected radio waves from the direction of the geometric center of the target. The analysis of the causes of abnormal errors in measuring angles for the considered cases of numerical calculations is carried out.



ТЕОРИЯ РАДИОТЕХНИЧЕСКИХ ЦЕПЕЙ
Parametric synthesis of matching four-poles in a feedback circuit of multistage amplifiers reflective type
Abstract



PARAMETRIC SYNTHESIS OF MATCHING FOUR-POLES IN A FEEDBACK CIRCUIT OF MULTISTAGE AMPLIFIERS AND AUTOGENERATORS
Abstract



РАДИОФИЗИЧЕСКИЕ ЯВЛЕНИЯ В ТВЕРДОМ ТЕЛЕ И ПЛАЗМЕ
SELF-MODULATING QUASI-REGULAR AND CHAOTIC OSCILLATIONS IN A NONLINEAR SYSTEM OF TWO CONNECTED OSCILLATORS
Abstract



ЭЛЕКТРОННАЯ И ИОННАЯ ОПТИКА
PARAXIAL APPROXIMATION IN THE REGION OF FORMATION OF ELECTRON BEAM OF PLANAR GYROTRON
Abstract






НОВЫЕ РАДИОЭЛЕКТРОННЫЕ СИСТЕМЫ И ЭЛЕМЕНТЫ
Features of simulation of periodic steady-state in nonlinear networks with memristor devices
Abstract


