scholarly journals Plasma semiconductor antenna

2021 ◽  
Vol 2103 (1) ◽  
pp. 012187
Author(s):  
A S Brusentsev ◽  
N N Bogachev ◽  
S G Dogaev ◽  
S Yu Kazantsev ◽  
A I Sattarova ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Laser Plasma ◽  
Return Loss ◽  
Satellite Navigation ◽  
Loop Antenna ◽  
Laser Source ◽  
Scattering Parameter ◽  
Loop Antennas ◽  
And Control ◽  
Plasma Control

Abstract The purposes of this work was to study the possibility of using photoconductive semiconductor antenna based on Ge or GaAs for receiving information signals in the frequency communications and satellite navigation bands and to study a scattering parameter S11 – a return loss (a reflection coefficient) of configurable loop antennas with laser-plasma control based on semiconductor photoresistor. It is shown that the addition of semiconductor photoresistor element in the loop antenna makes it possible to significantly expand its functionality and control its characteristics using an external laser source.

LOOP ANTENNA WITH A SEMICONDUCTOR ELEMENT

2021 ◽  
Author(s):  
П.А. ТИТОВЕЦ ◽  
А.И. САТТАРОВА ◽  
А.А. ПИЩЕРКОВ ◽  
Н.С. БЕКУШЕВ
Keyword(s):  
Laser Radiation ◽  
Reflection Coefficient ◽  
Copper Foil ◽  
Loop Antenna ◽  
Laser Source ◽  
Reflection Coefficients ◽  
Building Element ◽  
External Contour ◽  
In Series ◽  
Loop Antennas

Представлены результаты исследований рамочной антенны, в которой подстроечным элементом является фоторезистор, управляемый лазерным излучением. Показано, что использование фоторезистора как элемента внешнего контура рамочной антенны, включенного последовательно, позволяет изменять согласование рамочной антенны с помощью внешнего лазерного источника. Представлены результаты исследований характеристик коэффициента передачи рамочных антенн, состоящих из медной фольги на диэлектрической основе и полупроводникового элемента. Установлено, что при изменении интенсивности лазерного излучения, падающего на полупроводниковый элемент-фоторезистор, изменяется коэффициент отражения рамочной антенны. В диапазоне от 10 МГц до 18ГГц получены зависимости коэффициентов отражения (Su)рамочных антенн с полупроводниковым элементом. Проведено сравнение рамочной антенны и рамочной антенны с фоторезистором. The results of an experiment with a loop antenna, in which the building element is a photoresistor controlled by laser radiation, are presented. It is shown that the use of a photoresistor as an element of the external contour of a loop antenna connected in series makes it possible to change the matching of the loop antenna due to an external laser source. The results of studies of the characteristics of the transmission coefficient of loop antennas consisting of a dielectric copper foil and a semiconductor element are presented. It was found that when the intensity of the laser radiation incident on the semiconductor element-photoresistor changes, the reflection coefficient of the frame antenna changes. In the range of 10 MHz-18 GHz, the dependences of the reflection coefficients (S11) of loop antennas with a semiconductor element are obtained. A comparison is made between a loop antenna and a loop antenna with a photoresistor.

scholarly journals A Compact Four-Port Coplanar Antenna Based on an Excitation Switching Reconfigurable Mechanism for Cognitive Radio Applications

2019 ◽  
Vol 9 (15) ◽  
pp. 3157 ◽  
Author(s):  
O ◽  
Jin ◽  
Choi
Keyword(s):  
Cognitive Radio ◽  
High Frequency ◽  
Coplanar Waveguide ◽  
Low Frequency ◽  
Loop Antenna ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Uwb Antenna ◽  
High Isolation ◽  
Loop Antennas

In this paper, we propose a compact four-port coplanar antenna for cognitive radio applications. The proposed antenna consists of a coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna and three inner rectangular loop antennas. The dimensions of the proposed antenna are 42 mm × 50 mm × 0.8 mm. The UWB antenna is used for spectrum sensing and fully covers the UWB spectrum of 3.1–10.6 GHz. The three loop antennas cover the UWB frequency band partially for communication purposes. The first loop antenna for the low frequency range operates from 2.96 GHz to 5.38 GHz. The second loop antenna is in charge of the mid band from 5.31 GHz to 8.62 GHz. The third antenna operates from 8.48 GHz to 11.02 GHz, which is the high-frequency range. A high isolation level (greater than 17.3 dB) is realized among the UWB antenna and three loop antennas without applying any additional decoupling structures. The realized gains of the UWB antenna and three loop antennas are greater than 2.7 dBi and 1.38 dBi, respectively.

scholarly journals TERESA Target Area at ELI Beamlines

2020 ◽  
Vol 4 (4) ◽  
pp. 37
Author(s):  
Maksym Tryus ◽  
Filip Grepl ◽  
Timofej Chagovets ◽  
Andriy Velyhan ◽  
Lorenzo Giuffrida ◽  
...  
Keyword(s):  
Laser Beam ◽  
Control Systems ◽  
Laser Plasma ◽  
Plasma Diagnostics ◽  
High Repetition Rate ◽  
Target Area ◽  
Beam Transport ◽  
High Repetition ◽  
And Control ◽  
Accelerated Particles

The TERESA (TEstbed for high REpetition-rate Sources of Accelerated particles) target area, recently commissioned with the L3-HAPLS laser at Extreme Light Infrastructure (ELI)-Beamlines, is presented. Its key technological sections (vacuum and control systems, laser parameters and laser beam transport up to the target) are described, along with an overview of the available plasma diagnostics and targetry, tested at relativistic laser intensities. Perspectives of the TERESA laser–plasma experimental area at ELI-Beamlines are briefly discussed.

scholarly journals Study and analysis of discontinuity by using taper baluns

2015 ◽  
Vol 4 (2) ◽  
pp. 283
Author(s):  
Hussein Aldahhan ◽  
Bashar Qas Elias
Keyword(s):  
Reflection Coefficient ◽  
Transmission Line ◽  
Insertion Loss ◽  
Power Flow ◽  
Microstrip Line ◽  
Return Loss ◽  
Wide Band ◽  
Coplanar Stripline ◽  
Insertion Losses

A coplanar stripline (CPS) to microstrip line transition (MSL) are designed with high characteristics, such as wide band, low return loss and high insertion loss. Two types of tapers are proposed, exponential and triangular to decreases of discontinuity in the power flow in transmission line. The suggested design achieved reflection coefficient under -10 dB over wide band from 1 GHz to 3 GHz and insertion losses of less than 1 dB.

Intense laser source for X-ray laser research and laser-plasma study

1993 ◽  
Author(s):  
Ouyang Bin ◽  
Zhizhan Xu ◽  
Li-Huang Lin ◽  
Shisheng Cheng ◽  
Haihe Lu ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Intense Laser ◽  
Laser Source ◽  
X Ray

scholarly journals Optical analogue gravity physics: resonant radiation

2020 ◽  
Vol 378 (2177) ◽  
pp. 20190231 ◽  
Author(s):  
Jack Petty ◽  
Friedrich König
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Pulse ◽  
Energy Conversion Efficiency ◽  
Laser Source ◽  
Photonic Crystal Fibre ◽  
Analogue Gravity ◽  
Similarities And Differences ◽  
And Control ◽  
Scientific Fields ◽  
Resonant Radiation

The photonic crystal fibre (PCF) is a unique medium giving us the opportunity to perform experiments in carefully chosen regimes with precision and control. Using PCFs, we can perform analogue gravity experiments to study the physics of Hawking radiation and related processes such as resonant radiation. We discuss the similarities and differences between these processes and experimentally investigate the limits of effects of this type, dis- covering a new regime of record efficiency. We measure a 60% energy conversion efficiency from a pump to a visible femtosecond pulse by the process of resonant radiation, and demonstrate its extraordinary tunability in wavelength and bandwidth. Beyond analogue gravity, these femtosecond visible pulses provide a desirable laser source useful across a variety of modern scientific fields. This article is part of a discussion meeting issue ‘The next generation of analogue gravity experiments’.

scholarly journals Ion source perturbation and control in intense laser plasma interaction

2020 ◽  
Vol 5 (4) ◽  
pp. 045402
Author(s):  
B. Ramakrishna ◽  
S. Krishnamurthy ◽  
M. Tayyab ◽  
S. Bagchi ◽  
K. Makur ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Ion Source ◽  
Intense Laser ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
And Control
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