Flat-top THz directional diagram of DC-biased filament

2021 ◽  
Author(s):  
Irina Nikolaeva ◽  
Daniil Shipilo ◽  
Dmitrii Pushkarev ◽  
Georgy Rizaev ◽  
Daria Mokrousova ◽  
...  
Keyword(s):  
Directional Diagram

METHODS OF JAMMING INTERFERENCE

2018 ◽  
pp. 80-84
Author(s):  
A. V. Mazin ◽  
M. Yu. Aliyev
Keyword(s):  
Noise Immunity ◽  
Time Constraints ◽  
Joint Operation ◽  
Directional Diagram ◽  
Main Method ◽  
High Noise ◽  
Time Processing ◽  
Radar Systems ◽  
Interference Signals ◽  
Selection Of

The article investigates the problem of providing high noise immunity radar under the influence of passive and intentional interference. The purpose of radio operation of the radar is to create conditions that would impede the operation of systems and minimize its effectiveness. The main method of radio transmission is still creating (staging) interference. Modern radar systems must solve the tasks in terms of electronic suppression using, including intentional interference and under severe time constraints. It is shown that the most effective way to improve the noise immunity of radar systems designed to operate in multipoint space, including non-stationary, interference is adaptive space-time processing of the received signals, based on the angular selection of targets, due to the formation of zeros in the directional diagram in the direction of interference sources. This problem is solved by determining the accuracy of the direction finding of interference sources and is achieved by the joint operation of the antenna array and multi-channel signal processing devices, namely the separation of interference signals on different receiving channels.

scholarly journals Axial-Symmetric Diffraction Radiation Antenna with a Very Narrow Funnel-Shaped Directional Diagram

2021 ◽  
Vol 11 (21) ◽  
pp. 10381
Author(s):  
Yuriy Sirenko ◽  
Seil Sautbekov ◽  
Merey Sautbekova ◽  
Nataliya Yashina ◽  
Nursaule Burambayeva ◽  
...  
Keyword(s):  
Surface Wave ◽  
Dielectric Waveguide ◽  
Symmetry Axis ◽  
Coherent Radiation ◽  
Diffraction Radiation ◽  
Spatial Harmonic ◽  
Axially Symmetric ◽  
Directional Diagram ◽  
Modeling And Analysis ◽  
Periodic Grating

The paper is focused on reliable modeling and analysis of axially symmetric radiators with a very narrow (throat) funnel-shaped radiation pattern. When such a diagram is formed, a wave analogue of Smith–Purcell coherent radiation is realized—the surface wave of a radial dielectric waveguide ‘sweeps out’ with its exponentially decaying part a concentric periodic grating, the fundamental spatial harmonic of which, propagating without attenuation in a direction close to the symmetry axis of the structure, generates a radiation field with the required characteristics.

scholarly journals TRANSITION RADIATION OF A RELATIVISTIC ELECTRON BUNCH ON A SEMI-INFINITE METAL CYLINDER

2021 ◽  
pp. 103-106
Author(s):  
V.A. Balakirev ◽  
I.N. Onishchenko
Keyword(s):  
Field Strength ◽  
Electromagnetic Radiation ◽  
Relativistic Electron ◽  
Electron Bunch ◽  
Transition Radiation ◽  
Wave Zone ◽  
Directional Diagram ◽  
Metal Cylinder ◽  
Conducting Cylinder

Transition radiation of a relativistic electron bunch, which arises when it collides with the end face of a semi-infinite ideally conducting cylinder, is considered. An electron bunch moves along the axis of a semi-infinite cylin-der. Expressions for the field strength of electromagnetic radiation in the wave zone are obtained. The influence of the guiding properties of an ideally conducting cylinder on the directional diagram of the transition radiation is investigated.

scholarly journals Analysis of the Impact of Cellular Microwave Radiation on People

2019 ◽  
pp. 37-47
Author(s):  
Sergey Chernykh
Keyword(s):  
Microwave Radiation ◽  
Scientific Research ◽  
Cellular Communication ◽  
Point Of View ◽  
Entire Body ◽  
Directional Diagram ◽  
Environmental Friendliness ◽  
Special Events ◽  
Points Of View ◽  
The Impact

In the media there is a huge amount of material on the impact of cellular communication on people. In many materials, there are partially contradictory, and often mutually exclusive, points of view on this problem. Since this problem can be defined as personal for almost any inhabitant of our planet, there is a quite natural desire to find the ‘most correct’ point of view, with which almost every person (or the overwhelming majority) would agree. In this paper, we analyze the numerous points of view on the effect of microwave radiation from cellular communication on humans, and estimate the intensity of the electromagnetic field of cellular communication for various situations most frequently encountered in everyday life. Based on the analysis and estimates received, an independent technical position on this issue is presented and an attempt is made to forecast the further development of cellular communication. The further existence of cellular communication is seen in the organization of scientific research in the field of security of cellular communication for the population, its environmental friendliness. This, in turn, will lead to special events, as well as the development and improvement of devices that would reduce the impact of EMF means of cellular communication on users. First of all, it is necessary to protect the subscriber’s head from radiation, which is achieved by creating MT antennas with a special (not affecting the subscriber’s head) directional diagram, or by creating and improving special devices that allow to negotiate MT without leaning MT to the head (such gadgets already exist). Ideally, of course, it is necessary to protect the entire body of the subscriber from the impact of EMF of its own MT, if not all the time, then at least during the conversation on MT, but to solve this problem, additional scientific research is needed.

ABOUT THE PALEOCANAL OF THE RIVER ASHAMBA IN BLUE BAY ACCORDING TO THE DATA OF BROADBAND SEISMOACOUSTIC PROFILING

2020 ◽  
Vol 48 (4) ◽  
pp. 127-140
Author(s):  
M. S. Klyuev ◽  
A. A. Shreider ◽  
A. L. Brekhovskikh ◽  
A. S. Zverev
Keyword(s):  
Black Sea ◽  
Directional Diagram ◽  
Gps Navigation ◽  
Gas Flares ◽  
Coastal Sea ◽  
The City ◽  
Geomorphological Analysis

A paleochannel and paleotributary of the Ashamba River at the bottom of the Blue Bay in Black Sea near the city of Gelendzhik were discovered and studied using broadband seismoacoustic profiling. A basic description of the geomorphology of the Blue Bay bottom is presented. The technology for studying bottom paleostructures of the coastal sea zone by means of broadband seismoacoustic profiling with a different directional diagram and GPS navigation is presented. The composition and main characteristics of the equipment used are presented. The results of profiling and transverse profiles of the paleochannel and paleotributary of the Ashamba River are presented, as well as their geomorphological analysis. Gas flares accompanying the paleochannel of the Ashamba River were discovered. A detailed map of the river paleostructures of the Blue Bay bottom and the discovered gas flares has been compiled.

scholarly journals DEVELOPMENT OF CONCEPT OF HARDWARE-SOFTWARE COMPLEX OF MODULAR DESIGN FOR DETERMINATION OF ANTENNA SYSTEMS׳ CHARACTERISTICS BASED ON MEASUREMENTS IN THE NEAR FIELD

2017 ◽  
Vol 8 (2) ◽  
pp. 151-159 ◽  
Author(s):  
A. G. Buday ◽  
A. P. Grinchuk ◽  
A. V. Gromyko
Keyword(s):  
Radiation Field ◽  
Modular Design ◽  
Phase Distribution ◽  
Near Field ◽  
Antenna System ◽  
Directional Diagram ◽  
Spherical Coordinate ◽  
Software Complex ◽  
Wide Range ◽  
Antenna Systems

Measuring the amplitude-phase distribution of the radiation field of complex antenna systems on a certain surface close to the radiating aperture allows solving the problem of reconstructing the free-space diagram in the far field and also helps in determining the influence of various structural elements and defects of radiating surfaces on formation of directional diagram. The purpose of this work was to develop a universal hardware-software complex of a modular design aimed for determining the characteristics of wide range of antenna systems in respect of measurements of the amplitude-phase distribution of the radiation field in the near zone.The equations that connect the structure of radiation fields of the antenna system at various distances from it in planar, cylindrical and spherical coordinate systems as well as structural diagrams of the hardware part of measuring complexes have been analyzed.As a result, the concept of constructing a universal hardware-software complex for measuring the radiation field of various types of antenna systems with any type of measurement surface for solving a wide range of applied problems has been developed. A modular structure of hardware and software has been proposed; it allows reconfiguring the complex rapidly in order to measure the characteristics of any particular antenna system at all stages of product development and testing, and also makes the complex economically accessible even for small enterprises and organizations.

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