Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "horn antenna" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Using microwave refraction to determine local inhomogeneities of a rotating plasma
Autorzy:
Martseniuk, Yurii P.
Siusko, Yevhen V.
Kovtun, Yurii V.
Powiązania:
https://bibliotekanauki.pl/articles/2202564.pdf
Data publikacji:
2023
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
horn antenna
inhomogeneities
reflected microwave
reflectometry
refraction
Opis:
To determine the local inhomogeneities of a rotating plasma, the method based on microwave refraction was used. The method is based on spectral and correlation analysis of the refl ected signals from the rotating plasma layer at normal and inclined microwave incidence. This method allowed us to determine local inhomogeneities of plasma electron density, angles of azimuthal displacement of grooves, and its angular frequency of rotation. Using an additional 4th horn antenna, in contrast to previous works, it was possible to fi nd and analyze two regions with azimuthal inhomogeneities in the rotating plasma. Analysis of the refl ected signals shows the presence of four grooves, and the angular frequency of rotation = 1.16 × 104 rad/s was also determined.
Źródło:
Nukleonika; 2023, 68, 1; 19--24
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of photonic crystal horn antenna for transverse electric modes
Autorzy:
Beiranvand, Ehsan
Danaie, Mohammad
Afsahi, Majid
Powiązania:
https://bibliotekanauki.pl/articles/1835804.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal-based horn antenna
transverse electrical mode
FDTD method
Opis:
In this paper, by modifying defects in a photonic crystal lattice, a two-dimensional photonic crystal horn antenna is designed. The photonic crystal used for this purpose is composed of a hexagonal lattice of circular holes in a dielectric slab. The results of this paper allow us to design a photonic crystal antenna capable of separating TE and TM modes. The designed structure has a very simple design that allows low cost fabrication. The structure is numerically simulated using a finite-difference time-domain (FDTD) method. Its wide bandwidth, its low loss and the ability to transmit waves at a terahertz frequency range are the antenna’s main advantages. The return loss for the frequency range of 180 to 215 THz is from –6.63 to –28.3 dB. Moreover, a 35 THz bandwidth is obtained for this structure.
Źródło:
Optica Applicata; 2020, 50, 3; 401-413
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High power microwave for knocking out programmable suicide drones
Autorzy:
Chaari, Mohamed Zied
Powiązania:
https://bibliotekanauki.pl/articles/1311126.pdf
Data publikacji:
2021
Wydawca:
Akademia Sztuki Wojennej
Tematy:
high power microwave
conical horn antenna
errant drone
kill drone
high frequency
Opis:
The primary research objective is to reduce the dangers of rogue drones in our lives and the consequences of extremist groups, drug dealers, and organised criminals using them. The growing number of incidents involving modified drones proves the weakness of existing technology in stopping and neutralising errant drones such as the hand-held gun jammer, trained eagle, R.F. jammer, and others. This technology is not very likely to able to knock out a rogue drone and is incapable of stopping programmable drones. This article aims to examine the directed energy of HPM (high power microwaves) in using the electromagnetic field strength energy to damage the drone’s structure or burn its PCB board electronics. It goes on to analyse electronic attack using microwave power with high frequency to immediately switch off drones. The effectiveness of high microwave power for disrupting drones at different distances and in different weather conditions is evaluated. A study of the conical horn antenna of the magnetron coupling system, which has an operating frequency of 2.45 GHz, is also included.
Źródło:
Security and Defence Quarterly; 2021, 34, 2; 68-84
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies