Articole din publicaţii internaţionale: Recent submissions

  • DC- and IF-noise performance optimization of GaAs Schottky diodes for THz applications 
    COJOCARI, O.; BIBER, S.; MOTTET, B.; RODRIGUEZ-GIRONES, M.; HARTNAGEL, H. L.; SCHMIDT, L.-P. (IOP Publishing, 2004)
  • Compact Schottky barrier diode receiver for E-Band (60–90 GHz) wireless communications 
    MONTERO-DE-PAZ, Javier; HOEFLE, Matthias; OPREA, Ion; COJOCARI, Oleg; GARCÍA-MUÑOZ, Luis Enrique; SEGOVIA-VARGAS, Daniel; JAKOBY, Rolf; CARPINTERO, Guillermo (IEEE, 2012)
    A compact E-Band receiver based on a zero bias Schottky barrier diode, folded dipole antenna and hyperhemispherical silicon lens for wireless communications is presented. Zero bias Schottky diodes were designed and ...
  • Compact quasi-optical Schottky detector with fast voltage response 
    PENIRSCHKE, A.; SOBORNYTSKYY, M.; PREU, S.; MITTENDORFF, M.; WINNERL, S.; HOEFLE, M.; COJOCARI, O.; JAKOBY, R. (IEEE, 2014)
    Zero-bias Schottky diode detectors operated at room-temperature are the choice for applications, where the ultimate sensitivity of a cryogenic detector is not needed. Furthermore Schottky detectors are intrinsically much ...
  • Compact Modules for Wireless Communication Systems in the E-Band (71–76 GHz) 
    MONTERO-DE-PAZ, Javier; OPREA, Ion; RYMANOV, Vitaly; BABIEL, Sebastian; GARCÍA-MUÑOZ LUIS, Enrique; LISAUSKAS, Alvydas; HOEFLE, Matthias; JIMENEZ, Álvaro; COJOCARI, Oleg; SEGOVIA-VARGAS, Daniel; PALANDÖKEN, Merih; TEKIN, Tolga; STÖHR, Andreas; CARPINTERO, Guillermo (Springer Nature Switzerland, 2013)
    The millimeter-wave spectrum above 70 GHz provides a cost-effective solution to increase the wireless communications data rates by increasing the carrier wave frequencies. We report on the development of two key components ...
  • Compact direct detection Schottky receiver modules for sub-terahertz wireless communications 
    GUZMAN, R.; DUCOURNAU, G.; GARCÍA MUÑOZ, L. E.; SEGOVIA, D.; COJOCARI, O.; CARPINTERO, G. (IEEE, 2016)
    In this paper we present 1Gb/s wireless data reception at different sub-THz carrier wave frequencies, using a single quasi-optic Schottky receiver module. The module employs a Log-Spiral broadband antenna patterned on ...
  • Compact and Sensitive Millimetre Wave Detectors Based on Low Barrier Schottky Diodes on Impedance Matched Planar Antennas 
    HOEFLE, Matthias; HAEHNSEN, Katharina; OPREA, Ion; COJOCARI, Oleg; PENIRSCHKE, Andreas; JAKOBY, Rolf (Springer Nature Switzerland, 2014)
    Compact and highly responsive millimeter wave planar Schottky detectors are proposed for uni-planar and low-cost fabrication. For optimum power transfer, the zero-bias Schottky diodes are impedance matched by the antenna ...
  • Characterisation of low-barrier Schottky diodes for millimeter wave mixer applications 
    KHANAL, Subash; KIURU, Tero; HOEFLE, Matthias; MONTERO, Javier; COJOCARI, Oleg; MALLAT, Juha; PIIRONEN, Petri; RÄISÄNEN, Antti V. (IEEE, 2016)
    This paper presents the characterization measurements and simulations performed with ACST InGaAs low-barrier Schottky diodes for millimeter wave mixing applications. While these low-barrier Schottky diodes have been ...
  • Building an end user focused THz based ultra high bandwidth wireless access network: The TERAPOD approach 
    DAVY, Alan; PESSOA, Luis; RENAUD, Cyril; WASIGE, Edward; NAFTALY, Mira; KÜRNER, Thomas; GEORGE, Glenn; COJOCARI, Oleg; O'MAHONY, Niamh; PORCEL, Marco A. G. (IEEE, 2017)
    The TERAPOD project aims to investigate and demonstrate the feasibility of ultra high bandwidth wireless access networks operating in the Terahertz (THz) band. The proposed TERAPOD THz communication system will be developed, ...
  • Broadband zero-bias Schottky detector for E-field measurements up to 100 GHz and beyond 
    HOEFLE, M.; PENIRSCHKE, A.; COJOCARI, O.; JAKOBY, R. (IEEE, 2013)
    A broadband detector for electrical field measurements is presented in this paper, deploying an attenuated dipole resonance. High sensitive zero-bias Schottky diodes with anode diameters of 1.5μm allow electrical field ...
  • Broadband power detector using a circularly-toothed planar logarithmic-periodic antenna 
    SYDLO, C.; KÖGEL, B.; COJOCARI, O.; FEIGINOV, M.; HARTNAGEL, H. L.; MEISSNER, P. (IEEE, 2005)
    A broadband antenna has been coupled to a planar Schottky diode for the realisation of a sensitive power detector for mm-wave frequencies. The measured response curve is in agreement with calculations and shows values of ...
  • Application of Zero-Bias Quasi-Optical Schottky-Diode Detectors for Monitoring Short-Pulse and Weak Terahertz Radiation 
    SEMENOV, A.; COJOCARI, O.; HÜBERS, H.; SONG, F.; KLUSHIN, A.; MÜLLER, A. (IEEE, 2010)
    Schottky diodes are well-known nonlinear elements allowing for effective detection and mixing of electromagnetic radiation in the range through microwave to terahertz. Although less sensitive than their superconducting ...
  • Addressing the temperature stability in an 89 GHz Schottky detector design for radiometry 
    HOEFLE, Matthias; PENIRSCHKE, Andreas; AMRHEIN, Andreas; COJOCARI, Oleg; TRIER, Marc; JAKOBY, Rolf (IEEE, 2012)
    A detector design for the 89 GHz channel of direct detection radiometers is proposed with high sensitive zerobias Schottky diodes. Particularly addressed is the diode's RF voltage responsivity drift with temperature at ...
  • A novel system for systematic microwave noise and DC characterization of terahertz Schottky diodes 
    BIBER, S.; COJOCARI, O.; REHM, G.; MOTTET, B.; RODRIGUEZ-GIRONES, M.; SCHMIDT, L.-P.; HARTNAGEL, H. L. (IEEE, 2004)
    An automated system is developed to evaluate a large number Schottky diodes for terahertz applications with respect to their dc and noise characteristics using a highly sensitive noise measurement technique for one port ...
  • A new structural approach for uniform sub-micrometer anode metallization of planar THz Schottky components 
    COJOCARI, O.; MOTTET, B.; RODRIGUEZ-GIRONES, M.; BIBER, S.; MARCHAND, L.; SCHMIDT, L.-P.; HARTNAGEL, H. L. (IOP Publishing, 2004)
    This paper presents the evaluation of a Schottky contact technology based on electrochemical metal deposition. The results of a long-term systematic investigation and optimization of the anode formation process to improve ...
  • A Flexible Phase-Insensitive System for Broadband CW-Terahertz Spectroscopy and Imaging 
    YAHYAPOUR, M.; VIEWEG, N.; ROGGENBUCK, A.; RETTICH, F.; COJOCARI, O.; DENINGER, A. (IEEE, 2016)
    We present a compact, robust, and flexible continuous-wave (CW) terahertz system, ideally suited for both imaging and high-resolution broadband spectroscopy. The setup employs an incoherent detection scheme: A photomixer ...
  • 89 GHz zero-bias Schottky detector for direct detection radiometry in European satellite programme MetOp-SG 
    HOEFLE, M.; PENIRSCHKE, A.; COJOCARI, O.; DECOOPMAN, T.; TRIER, M.; PIIRONEN, P.; PÉRICHAUD, M. G.; JAKOBY, R. (The Institution of Engineering and Technology, 2014)
    An 89 GHz waveguide coupled direct detector based on a low-barrier Schottky diode is presented. The main focus is to reduce white and 1/f noise to achieve high signal-to-noise ratio values above 35 dB. The design also ...
  • 89 GHz Schottky detector modules for MetOp-SG 
    HOEFLE, Matthias; COJOCARI, Oleg; RICKES, Martin; SOBORNYTSKYY, Mykola; MONTERO-DE-PAZ, Javier; DECOOPMAN, Thibaut; KANTANEN, Mikko; PÉRICHAUD, Marie-Genevieve; PIIRONEN, Petri (IEEE, 2016)
    Presented is an 89 GHz waveguide coupled direct detector based on ACST low-barrier Schottky diodes. Signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic are achieved with high voltage responsivity ...
  • 600 GHz GaAs Schottky diode mixer in split-block technology 
    SCHUR, J.; BIBER, S.; COJOCARI, O.; SCHMIDT, L.-P.; HARTNAGEL, H.-L. (IEEE, 2013)
    In this paper we present measurement results of a micro-machined split-block waveguide mixer for 600 GHz. The mixer implements a planar GaAs Schottky diode on a quartz substrate. Two different diode designs used for this ...
  • 1/f-noise prediction in millimeter wave detectors based on quasi vertical Schottky diodes 
    HOEFLE, Matthias; PENIRSCHKE, Andreas; COJOCARI, Oleg; AMRHEIN, Andreas; DECOOPMAN, Thibaut; PIIRONEN, Petri; JAKOBY, Rolf (IEEE, 2013)
    A modeling concept for accurate prediction of 1/f-noise in millimeter wave Schottky detectors is presented. The concept is based on DC bias current measurements with precise knowledge of the diode structure. Key aspect is ...
  • Porosification of III–V and II–VI Semiconductor Compounds 
    EDUARD, Monaico; GLEB, Colibaba; DMITRII, Nedeoglo; KORNELIUS, Nielsch (American Scientific Publishers, 2014)
    We report on a comparative study of the pore growth during anodization of a narrow-bandgap III–V compound (InAs), a medium-bandgap III–V one (InP) and wide-bandgap II–VI semiconductors (ZnSe and Zn0.4Cd0.6S). According to ...

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