Reception of Electromagnetic Pulses of Nanosecond Duration by the Multi-Element Ferrite Antenna

Author(s):  
Tetiana Ogurtsova ◽  
Natalya Blinova ◽  
Gennadiy Pochanin ◽  
Pavlo Kholod
2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
O.A. Gulevich ◽  
◽  
L.B. Volkomirskaya ◽  
I.V. Mingalev ◽  
Z.V. Suvorova ◽  
...  

The results of the numerical solution of the problem of propagation of an electromagnetic video pulse signal of nanosecond duration in a dissipative medium are presented for use in the deep georadar data interpretation. Based on the developed scheme for integrating Maxwell's equations, the results of numerical modeling of the propagation of electromagnetic pulses of various shapes without approximations, usually used in the traditional solution of GPR problems, including the separation of temporal and spatial variables of the electromagnetic field and neglect of the rapid field change in comparison with the processes occurring in the medium, are obtained. The influence of the pulse shape on the shape of the electromagnetic echo signal is considered for various models of the medium close to real conditions, including those with a gradient change in electrical conductivity and permittivity. The influence of the distribution of electrical conductivity of the medium is studied.


1997 ◽  
Vol 51 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Alexander P. Nikolaenko

2020 ◽  
Vol 13 (1) ◽  
pp. 16
Author(s):  
Kukjoo Kim ◽  
Kyung-Ryeung Min ◽  
Young-Jun Park

The Korean peninsula is under increasing threat of electromagnetic pulses (EMPs) from neighboring countries; EMP protection facilities are an essential means of ensuring the operational readiness of the military. However, existing EMP protection facilities are manufactured as fixed-weight structures, which limit the mobility of military operations and lead to the misconception of EMP protection as something only required for higher command. The current military and official EMP protection standards require only a uniform shielding effectiveness of 80 dB. Therefore, this study aims to differentiate the existing uniform level of shielding effectiveness of 80 dB into 80 dB, 60 dB, 40 dB, etc. Further, it seeks to derive the factors to be considered when applying various methods, such as shielding rooms, shielding racks, site redundancy, spare equipment, and portable lightweight protective tents, for recovery of failure, instead of the existing protection facilities that rely on shielded rooms by the Delphi analysis. Then, the applicability of lightweight EMP protection is determined after selecting lightweight materials to build a facility. The electromagnetic shielding performance of 21 types of materials was measured in the 30 MHz–1.5 GHz frequency band using ASTM-D-4935-10. The results showed the possibility of developing a lightweight EMP shielding facility, which would save approximately 316,386 tons of concrete, reducing the CO2 emissions by approximately 9,972,489 tons. Assuming that the Korean carbon transaction price is USD 50/ton CO2, the savings are equivalent to USD 49,862,435.


2020 ◽  
Vol 2 (3) ◽  
Author(s):  
M. Bardon ◽  
B. Etchessahar ◽  
F. Lubrano ◽  
S. Bazzoli ◽  
M. Ferri ◽  
...  

2009 ◽  
Vol 79 (1) ◽  
Author(s):  
Daniel an der Brügge ◽  
Alexander Pukhov

2002 ◽  
Vol 49 (1) ◽  
pp. 33-37 ◽  
Author(s):  
S. LEISNER ◽  
R. SHAHAR ◽  
I. AIZENBERG ◽  
D. LICHOVSKY ◽  
T. LEVIN-HARRUS

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