Articole ştiinţifice: Recent submissions

  • RTD-based THz-MIC by Film-Diode technology 
    COJOCARI, Oleg; SYDLO, Cezary; FEIGINOV, Michael; MEISSNER, Peter (IEEE, 2012)
    This work aims at development of extremely compact and low-cost THz sources. Resonant-tunneling diode (RTD) is monolithically integrated with planar resonator and Vivaldi antenna on transferred membrane-substrate by ...
  • Resonant-tunnelling-diode oscillators operating at frequencies above 1.1 THz 
    FEIGINOV, Michael; SYDLO, Cezary; COJOCARI, Oleg; MEISSNER, Peter (American Institute of Physics, 2011)
    We present resonant-tunnelling-diode (RTD) oscillators operating at the fundamental frequency of 1111 GHz. We show that our RTDs and RTD oscillators have much room for further improvement of their parameters and for further ...
  • Resonant-tunnelling diodes for THz applications 
    FEIGINOV, Michael; SYDLO, Cezary; COJOCARI, Oleg; MEISSNER, Peter (Society of Photo-Optical Instrumentation Engineers, SPIE, 2012)
    We investigate experimentally resonant-tunnelling-diode (RTD) oscillators, which are based on RTDs with heavily doped collector. We demonstrate that such RTD oscillators can work at frequencies, which are far beyond the ...
  • Quasi-Optical Schottky Barrier Diode Detector for mmWave/sub-THz Wireless Communication 
    MUHSIN, Ali; GUZMAN, Robinson Cruzoe; RIVERA-LAVADO, Alejandro; COJOCARI, Oleg; GARCIA-MUFIOZ, Luis Enrique; CARPINTERO, Guillermo (IEEE, 2018)
    We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) envelope detector for mmWave/sub-THz frequencies. The detector consists of a Schottky diode mounted on a self-complementary ...
  • Quasi-Optic Transmitter and Receiver Modules Enabling Next-Generation Ultra-Broadband Wireless Links at Carrier-Wave Frequencies Ranging from 60 to 180 GHz 
    MUHSIN, Ali; GUZMÁN, Robinson Cruzoe; COJOCARI, Oleg; NELLEN, Simon; SANTAMARÍA, Gabriel; GARCÍA-MUÑOZ, Luis Enrique; SEGOVIA-VARGAS, Daniel; GLOBISCH, Björn; CARPINTERO, Guillermo (Springer Nature Switzerland, 2019)
    A wireless link using quasi-optic transmitter and receiver modules is demonstrated, enabling carrier wave frequency selection within various millimeter-wave bands from E-band to D-band without changing the modules. The ...
  • Quasi optical Schottky diode detectors for fast ultra-wideband detection 
    SOBORNYTSKYY, N.; LISAUSKAS, A.; WEICKHMANN, C.; JAKOBI, R.; SEMENOV, A.; HÜBERS, H.; MÜLLER, R.; HOEHL, A.; COJOCARI, O. (IEEE, 2013)
    We present ultra-wideband zero-bias Schottky diode detector modules with monolithically integrated log-spiral antenna. Detectors exhibit a broad-band response with a stronger roll-off above 800 GHz and the minimum ...
  • Quasi optical Schottky diode detectors for fast ultra-wideband detection 
    COJOCARI, O.; SOBORNYTSKYY, N.; WEICKHMANN, C.; JAKOBY, R.; SEMENOV, A.; HÜBERS, H.; MÜLLER, R.; HOEHL, A. (IEEE, 2016)
    We present ultra-wideband zero-bias Schottky diode detector modules with monolithically integrated log-spiral antenna. Detectors exhibit a broad-band response with a stronger roll-off above 800 GHz and the minimum ...
  • 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 ...

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