Articole din publicaţii internaţionale: Recent submissions

  • Process Control and Failure Analysis Implementation for THz Schottky-based components 
    ICHIZLI, V.; RODRÍGUEZ-GIRONÉS, M.; MARCHAND, L.; GARDEN, C.; COJOCARI, O.; MOTTET, B.; HARTNAGEL, H. L. (Elsevier, 2002)
    Schottky diodes and integrated circuits are most used devices for both frequency mixing and multiplying in THz range. Higher operational frequencies require of the devise dimensions. Devise dimensions in THz range are often ...
  • Optical mixing in THz Schottky diodes 
    SCHOENHERR, D.; COJOCARI, O.; SYDLO, C.; GOEBEL, T.; FEIGINOV, M.; HARTNAGEL, H. L.; MEISSNER, P. (IEEE, 2008)
    This paper presents the effect of optical mixing in zero-bias InGaAs Schottky detectors at THz frequencies. The excitation of ultrafast carriers by illumination with two 1.5 mum laser beams is verified. This proves the ...
  • Operation of resonant-tunnelling-diode oscillators beyond tunnel-lifetime limit at 564 GHz 
    FEIGINOV, M.; SYDLO, C.; COJOCARI, O.; MEISSNER, P. (IOP Publishing, 2012)
    We present resonant-tunnelling-diode (RTD) oscillators, which are operating at frequencies up to 564 GHz. Due to heavy doping of the collector side of our diodes, the oscillators are operating beyond the tunnel-lifetime ...
  • Operation of resonant-tunnelling oscillators beyond tunnel lifetime limit 
    FEIGINOV, M.; SYDLO, C.; COJOCARI, O.; MEISSNER, P. (IOP Publishing, 2011)
    The tunnel lifetime of the electrons in the quantum well of a resonant-tunnelling diode (RTD) is usually assumed to be imposing an inherent fundamental limitation on the operating frequencies of RTD oscillators. Here, we ...
  • Operation of quasi-optical a THz detectors in heterodyne regime 
    COJOCARI, O.; MARTYANOV, M.; MORO-MELGAR, D.; SOBORNYTSKYY, N. (IEEE, 2017)
    In recent years Schottky-diode technologies gain influence in THz systems because of their large sensitivity, wide range, high power capability and room-temperature operation. Schottky diodes rectify the RF signal directly ...
  • Millimetre-wave detectors for direct detection radiometers 
    DECOOPMAN, Thibaut; TRIER, Marc; MARTIN, Nadine; BOISBUNON, Dider; LEMASSON, Alain; TAILHADES, Jacques; FRIJLINK, Peter; HOEFLE, Matthias; COJOCARI, Oleg; PIIRONEN, Petri; PÉRICHAUD, Marie-Genevieve (IEEE, 2004)
    This paper reports on the activities carried out by Airbus DS SAS, OMMIC SAS and ACST GmbH during the ESA study “Micro and Millimetre-Wave Detectors” A081ET03. Two European technologies for direct detection have been ...
  • Micromachined split-block Schottky-diode mixer for 600 GHz 
    SCHUR, J.; BIBER, S.; GUMBMANN, F.; MOTTET, B.; COJOCARI, O.; SCHMIDT, L.-P.; HARTNAGEL, H.-L. (IEEE, 2004)
    This paper presents simulation results for a 600 GHz micromachined waveguide mixer with integrated horn antenna, a hybrid-integrated planar Schottky diode and IF filter structures on a quartz substrate. In addition to the ...
  • Conceptul calității vieții la interconexiunea cu sănătatea publică 
    GOROBIEVSCHI, Svetlana (Institutul Național de Cercetări Economice, 2020)
    În actuala teză științifică se trec în revistă legăturile reciproce dintre categoriile socio-economice calitatea vieții populuției și starea de sănătate a acesteia. Pornind de la definiția calității vieți și argumentând ...
  • Внедрение семейной медицины как новый этап развития охраны здоровья и качество жизни населения 
    КАУШАН, К. С.; САМКО, Г. Н.; ГАРБУЗНЯК, А. А.; ГОРОБИЕВСКИ, С. В. (Пятигорский медико-фармацевтический институт, 2020)
    Исходя из европейской практики системы здравоохранения, развитие семейной медицины весьма перспективно. Она позволит повысить уровень медицинского обслуживания, поставить ее на новый уровень. Оказание медицинских услуг ...
  • Low noise 89 GHz detector module for MetOp-SG 
    HOEFLE, Matthias; COJOCARI, Oleg; SOBORNYTSKYY, Mykola; JANKOWSKI, Andrzej; OPREA, Ion; PENIRSCHKE, Andreas; JAKOBY, Rolf; DECOOPMAN, Thibaut; PERICHAUD, Marie-Genevieve; PIIRONEN, Petri (IEEE, 2015)
    Presented is an 89 GHz waveguide coupled direct detector based on low-barrier Schottky diodes. The design aims for signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic, with significant white and ...
  • Highly responsive planar millimeter wave zero-bias Schottky detector with impedance matched folded dipole antenna 
    HOEFLE, M.; HAEHNSEN, K.; OPREA, I.; COJOCARI, O.; PENIRSCHKE, A.; JAKOBY, R. (IEEE, 2013)
    A compact highly responsive planar zero-bias Schottky detector is proposed for uni-planar and low-cost fabrication. Various zero-bias Schottky diodes are investigated, in particular the optimization of impedance matching ...
  • High-Power MM-Wave Frequency Multipliers 
    COJOCARI, O.; MORO-MELGAR, D.; OPREA, I. (IEEE, 2019)
    A novel approach has been developed on monolithic integration of Schottky diodes with CVD diamond substrate for improved thermal dissipation. This allowed development of mmwave frequency multipliers with unmatched ...
  • High-frequency nonlinear characteristics of resonant-tunnelling diodes 
    FEIGINOV, Michael; SYDLO, Cezary; COJOCARI, Oleg; MEISSNER, Peter (American Institute of Physics, 2011)
    The nonlinear response of resonant-tunnelling diodes (RTDs) is analysed theoretically at high frequencies (HFs), which are far above the diode’s tunnel-relaxation-time limit. We show that the HF I-V curve in this regime ...
  • High Power High Efficiency 270-320 GHz Source Based on Discrete Schottky Diodes 
    MORO-MELGAR, D.; COJOCARI, O.; OPREA, I. (IEEE, 2018)
    A 300 GHz source based on discrete Schottky diodes technology is reported in this work. The high frequency part developed by ACST consists of two high power and high efficiency doublers, one at 135-160 GHz and a second one ...
  • High power 150 GHz Schottky based varactor doubler 
    MONTERO-DE-PAZ, J.; SOBORNYTSKYY, M.; HOEFLE, M.; COJOCARI, O. (IEEE, 2016)
    Presented is the design, simulation and characterization of a high power 150 GHz Schottky based varactor doubler. The designed doubler works in the 67.5 GHz-82 GHz input frequency band with an input power of 25 dBm (315 ...
  • Generalized model of the metal/n-GaN Schottky interface and improved performance by electrochemical Pt deposition 
    COJOCARI, Oleg; HARTNAGEL, Hans L. (American Vacuum Society, 2006)
    A modified model of the Schottky interface is proposed, which includes a near-surface layer (NSL) in the depletion region of the semiconductor. An important effect of the NSL is the ability to make the value of the Schottky ...
  • Field Intensity Detection of Individual Terahertz Pulses at 80 MHz Repetition Rate 
    RETTICH, F.; VIEWEG, N.; COJOCARI, O.; DENINGER, A. (Springer Nature Switzerland, 2015)
    We present a new approach to detect the intensity of individual terahertz pulses at repetition rates as high as 80 MHz. Our setup comprises a femtosecond fiber laser, an InGaAs-based terahertz emitter, a zero-bias Schottky ...
  • Experimental validation of thermal model of MM-Wave frequency multipliers 
    OPREA, I.; COJOCARI, O.; SOBORNYTSKYY, M.; HARTNAGEL, H. L. (IEEE, 2013)
    This paper presents a method for estimation of junction temperature of a Schottky diode used in a recently developed frequency doubler to 332 GHz. Our particular interest was the validation of the thermal model of the diode ...
  • European Schottky-Diode Based Receiver Technology 
    COJOCARI, O.; HOEFLE, M.; MORO-MELGAR, D.; OPREA, I.; RICKES, M. (IEEE, 2019)
    This contribution summarizes recent achievements of European MM- and SubMM-Wave receiver technology using Schottky diodes and THz-MICs fabricated by so-called Film-Diode (FD) process. The FD-process has particularly been ...
  • Detection of individual terahertz pulses at 80 MHz repetition rate 
    RETTICH, F.; VIEWEG, N.; COJOCARI, O.; DENINGER, A. (IEEE, 2015)
    We present a novel technique to detect individual terahertz pulses at a repetition rate of 80 MHz. Our setup combines a femtosecond fiber laser, an InGaAs-based terahertz emitter, a zero-bias Schottky detector, and a ...

Search DSpace


Browse

My Account