scholarly journals Accurate Modeling and Analysis of Isolation Performance in Multiport Amplifiers

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Marinella Aloisio ◽  
Piero Angeletti ◽  
Salvatore D'Addio
Keyword(s):  
Monte Carlo ◽  
High Power ◽  
Rf Power ◽  
Tracking Errors ◽  
Modeling And Analysis ◽  
Phase Tracking ◽  
Satellite Systems ◽  
Power Amplification ◽  
Isolation Performance ◽  
Over Time

A Multiport Amplifier (MPA) is an implementation of the satellite power amplification section that allows sharing the payload RF power among several beams/ports and guarantees a highly efficient exploitation of the available DC satellite power. This feature is of paramount importance in multiple beam satellite systems where the use of MPAs allows reconfiguring the RF output power among the different service beams in order to handle unexpected traffic unbalances and traffic variations over time. This paper presents Monte Carlo simulations carried out by means of an ESA in-house simulator developed in Matlab environment. The objective of the simulations is to analyse how the MPA performance, in particular in terms of isolation at the MPA output ports, is affected by the amplitude and phase tracking errors of the high power amplifiers within the MPA.

scholarly journals Modeling and Analysis of High-Power Ti:sapphire Laser Amplifiers–A Review

2019 ◽  
Vol 9 (12) ◽  
pp. 2396 ◽  
Author(s):  
Jihoon Jeong ◽  
Seryeyohan Cho ◽  
Seungjin Hwang ◽  
Bongju Lee ◽  
Tae Jun Yu
Keyword(s):  
High Power ◽  
Average Power ◽  
Gain Medium ◽  
Phase Distortion ◽  
High Average Power ◽  
Modeling And Analysis ◽  
Laser Amplifiers ◽  
Ti:Sapphire Laser ◽  
Power Amplification ◽  
Distortion Effect

We have introduced several factors that can be useful for the modeling and analysis of high-power Ti:sapphire laser amplifiers. The amplification model includes the phase distortion effect caused by the atomic phase shift (APS) in gain medium and the thermal-induced phase distortion effect caused by the high-average-power amplification. We have provided an accurate amplification model for the development of ultra-high-intensity and high-average-power lasers.

Dielectric-loaded L-band filters for high-power space applications

2021 ◽  
pp. 1-11
Author(s):  
Paolo Vallerotonda ◽  
Fabrizio Cacciamani ◽  
Luca Pelliccia ◽  
Alessandro Cazzorla ◽  
Davide Tiradossi ◽  
...  
Keyword(s):  
High Power ◽  
Dielectric Resonators ◽  
Q Factor ◽  
Rf Power ◽  
Space Applications ◽  
High Q ◽  
Critical Issues ◽  
L Band ◽  
Multipactor Discharge ◽  
Filter Response

Abstract The design and first experimental results of Tx and Rx L-band bandpass filters for a high-power satellite diplexer are presented in this paper. Designed in the framework of an ESA ARTES AT project, the filters are based on TM010 mode dielectric resonators. These resonators allow for better results in terms of volume occupation with respect to other dielectric resonators still maintaining high Q-factor values (>2000). Volume saving above 30% is achieved with respect to standard coaxial filters. The filter geometries and materials have been chosen in order to improve the power-handling and to cope with related critical issues for space applications (i.e. avoid any multipactor discharge in the operating RF power range and low-PIM response). Measurements of Tx filter show good correlation with the design in terms of central frequency, BW, and unloaded Q-factor (almost 3000). Measurements of Rx filter show a worse correlation with the design in terms of filter response shape. This is ascribed to size tolerances of one of the filter resonators. Multiple analyses are ongoing to remove this degradation in the final engineering model.

Modeling and analysis of a micro-inverter configuration for high power phosphoric acid fuel cell application

2013 ◽  
Author(s):  
Somasundaram Essakiappan ◽  
Harish S. Krishnamoorthy ◽  
Jorge Ramos-Ruiz ◽  
Prasad Enjeti ◽  
Mohamed Arifujjaman ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Phosphoric Acid ◽  
High Power ◽  
Modeling And Analysis ◽  
Phosphoric Acid Fuel Cell ◽  
Fuel Cell Application ◽  
Micro Inverter

High power amplification of tunable optically carried RF signals by a diode pumped Yb3+doped LMA silicon fiber

2015 ◽  
Vol 12 (3) ◽  
pp. 035101 ◽  
Author(s):  
Tao He ◽  
Suhui Yang ◽  
Changming Zhao ◽  
Haiyang Zhang ◽  
Yinglei Liang ◽  
...  
Keyword(s):  
High Power ◽  
Power Amplification ◽  
Rf Signals ◽  
Diode Pumped

Linearity Aspects of High Power Amplification in GaN Transistors

2019 ◽  
pp. 83-107
Author(s):  
Samuel James Bader ◽  
Keisuke Shinohara ◽  
Alyosha Molnar
Keyword(s):  
High Power ◽  
Power Amplification

scholarly journals Effect of the Orientation Schemes of the Energy Collection Element on the Optical Performance of a Parabolic Trough Concentrating Collector

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 128 ◽  
Author(s):  
Majedul Islam ◽  
Prasad Yarlagadda ◽  
Azharul Karim
Keyword(s):  
Monte Carlo ◽  
State Of The Art ◽  
Tracking Error ◽  
Surface Group ◽  
Energy Performance ◽  
Optical Performance ◽  
Extended Version ◽  
Parabolic Trough ◽  
Tracking Errors ◽  
Optical Efficiency

While the circular shape is currently the proven optimum design of the energy collection element (ECE) of a parabolic trough collector, that is yet to be confirmed for parabolic trough concentrating collectors (PTCCs) like trough concentrating photovoltaic collectors and hybrid photovoltaic/thermal collectors. Orientation scheme of the ECE is expected to have significant effect on the optical performance including the irradiance distribution around the ECE and the optical efficiency, and therefore, on the overall energy performance of the PTCC. However, little progress addressing this issue has been reported in the literature. In this study, a thorough investigation has been conducted to determine the effect of the orientation schemes of ECE on the optical performance of a PTCC applying a state-of-the-art Monte Carlo ray tracing (MCRT) technique. The orientation schemes considered are a flat rectangular target and a hollow circular, semi-circular, triangular, inverted triangular, rectangular and rectangle on semi-circle (RSc). The effect of ECE defocus, Sun tracking error and trough rim angle on the optical performance is also investigated. The MCRT study reveals that the ECE orientation schemes with a curved surface at the trough end showed much higher optical efficiency than those with a linear surface under ideal conditions. ECEs among the linear surface group, the inverted triangular orientation exhibited the highest optical efficiency, whereas the flat and triangular ones exhibited the lowest optical efficiency, and the rectangular one was in between them. In the event of defocus and tracking errors, a significant portion of the concentrated light was observed to be intercepted by the surfaces of the rectangular and RSc ECEs that are perpendicular to the trough aperture. This is an extended version of a published work by the current authors, which will help to design an optically efficient ECE for a parabolic trough concentrating collector.

EXTRACTION OF GATE CAPACITANCE OF HIGH-FREQUENCY AND HIGH-POWER GaN HEMTs BY MEANS OF CELLULAR MONTE CARLO SIMULATIONS

2011 ◽  
Vol 20 (03) ◽  
pp. 423-430
Author(s):  
DIEGO GUERRA ◽  
FABIO ALESSIO MARINO ◽  
STEPHEN GOODNICK ◽  
DAVID FERRY ◽  
MARCO SARANITI
Keyword(s):  
Monte Carlo ◽  
High Power ◽  
High Frequency ◽  
Small Signal ◽  
Small Signal Analysis ◽  
Gan Hemt ◽  
Full Band ◽  
Cellular Monte Carlo ◽  
Dc Characterization

A high-frequency a high-power GaN HEMT was analyzed using our full band Cellular Monte Carlo (CMC) simulator, in order to extract small signal parameters and figures of merit, and to correlate them to carrier dynamics and distribution inside the device. A complete RF and DC characterization of the device was performed using experimental data to calibrate the few adjustable parameters of the simulator. Then, gate-related capacitances, such as Cg, Cgd, and Cgs, were directly and indirectly extracted combining small-signal analysis and DC characterization.

Amplified spontaneous emission and power amplification in high-power DF laser systems

2010 ◽  
Vol 8 (8) ◽  
pp. 764-767 ◽  
Author(s):  
陈星 Xing Chen ◽  
刘文广 Wenguang Liu ◽  
姜宗福 Zongfu Jiang
Keyword(s):  
Spontaneous Emission ◽  
High Power ◽  
Amplified Spontaneous Emission ◽  
Power Amplification ◽  
Laser Systems

High-power amplification of femtosecond optical pulses in a diode-pumped fiber system

1994 ◽  
Vol 19 (16) ◽  
pp. 1201 ◽  
Author(s):  
A. Galvanauskas ◽  
M. E. Fermann ◽  
D. Harter
Keyword(s):  
High Power ◽  
Optical Pulses ◽  
Fiber System ◽  
Power Amplification ◽  
Diode Pumped
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