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Browsing Articole ştiinţifice by Author "OPREA, Ion"

Browsing Articole ştiinţifice by Author "OPREA, Ion"

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  • A 600GHz High Power Tripler for Space Applications 
    GIBSON, Hugh J.; COJOCARI, Oleg; OPREA, Ion; THOMAS, Bertrand; NARHI, Tapani (Oxford, 2015)
    Several recent space missions have required un-cooled receivers for radiometer use above 500GHz for atmosphere probing. These include MetOP 2nd generation meteorological satellites and Jupiter Moons JUICE spacecraft. The ...
  • 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 ...
  • 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 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 ...
  • Efficiency enhancement of InGaN/GaN light-emitting diodes with pin-doped GaN quantum barrier 
    SIRKELI, Vadim P.; YILMAZOGLU, Oktay; AL-DAFFAIE, Shihab; OPREA, Ion; ONG, Duu Sheng; KÜPPERS, Franko; HARTNAGEL, Hans L. (IOP Publishing, 2016)
    Blue InGaN/GaN light-emitting diodes with undoped, heavily Si-doped, Si delta-doped, heavily Mg-doped, Mg delta-doped, and Mg–Si pin-doped GaN barrier are investigated numerically. The simulation results demonstrate that ...
  • High-Power MM-Wave Sources based on Schottky Diodes 
    COJOCARI, Oleg; MORO-MELGAR, Diego; OPREA, Ion; HOEFLE, Matthias; RICKES, Martin (IEEE, 2018)
    A novel approach has been developed at ACST for realization of high-power frequency multipliers in MM/SubMM-Wave range. This approach is based on discrete Schottky structures with monolithically-integrated diamond heatspreader. ...
  • 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 ...
  • Qualification of Direct Detection Technology for ESA MetOp-SG Space Mission 
    HOEFLE, Matthias; RICKES, Martin; OPREA, Ion; COJOCARI, Oleg (International Symposium on Space Terahertz Technology, ISSTT, 2017)
    This contribution presents the ACST 89 GHz Schottky detector module performance and pre-qualification results towards the second European meteorological operational satellite program MetOp-SG. The detector flight module ...
  • Resonant tunneling transport in ZnxBe1-xSe/ZnSe/ZnyBe1-ySe asymmetric quantum structures 
    SIRKELI, Vadim P.; YILMAZOGLU, Oktay; AL-DAFFAIE, Shihab; OPREA, Ion; ONG, Duu Sheng; KÜPPERS, Franko; HARTNAGEL, Hans L. (International Society for Optics and Photonics, 2017)
    II-VI compounds are promising materials for the fabrication of room-temperature terahertz devices due to their beneficial properties like as type-I conduction band alignment, high breakdown field strength (~331 kV/cm for ...
  • Schottky-based THz-MIC-s 
    COJOCARI, Oleg; OPREA, Ion; WALBER, Achim; GIBSON, Hugh (IEEE, 2011)
    This paper summarizes recently-achieved results for a frequency mixer and multiplier at Sub-mm-wavelengths, using a new-developed fabrication technology for Schottky-based Structures. Achieved results represent European ...
  • SubMM-wave multipliers by film-diode technology 
    COJOCARI, Oleg; OPREA, Ion; GIBSON, Hugh; WALBER, Achim (IEEE, 2016)
    A series of THz-MIC-s were successfully fabricated by a so-called Film-Diode process. Sub-millimeter-wave multipliers based on these MIC-s were tested with excellent results. Peak measured output power of these multipliers ...

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