MEC Srl

Bologna, Italy
Bologna, Italy

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Resca D.,MEC Srl | Scappaviva F.,MEC Srl
EuMIC 2016 - 11th European Microwave Integrated Circuits Conference | Year: 2016

A compact X-band (8.4 GHz to 9.8 GHz) single stage power amplifier (PA) is demonstrated using a discrete 0.25 μm discrete GaN power bar with 20 mm of total gate periphery and low-cost passive-only GaAs MMIC technology for the input/output matching. The PA, operated at 30V in pulsed conditions, provides more than 13 dB of linear gain and nearly 70W of output power with peak power added efficiency of 48% at 4 dB of gain compression. Its overall dimension of 6.42 × 4.56 mm2 makes it very suitable to be cascaded and power combined in highly integrated X-band SSPA schemes. An example of a possible SSPA output stage exploiting two PAs is given, providing a configuration a peak output power of 127 W with 38% of PAE was measured in pulsed conditions in the same frequency band. © 2016 European Microwave Association.


Florian C.,University of Bologna | Paganelli R.P.,CNR Institute of Electronics, Computer and Telecommunication Engineering | Lonac J.A.,MEC Srl | Lonac J.A.,Huawei
IEEE Transactions on Microwave Theory and Techniques | Year: 2012

The chip-set for the transmitting power lineup of satellite SAR antenna T/R modules has been designed and implemented exploiting a 2-μm GaInP-GaAs heterojunction bipolar transistor (HBT) technology suitable for space applications. The HBT technology features an integrated emitter ballast resistor that enables high-power density operation without suffering thermal runaway phenomena. Two monolithic microwave integrated circuit (MMIC) driver amplifiers and a MMIC HPA are described: the drivers exhibit small-signal gains exceeding 21 dB and P1 dB output power of about 28 and 29 dBm, respectively, in a 2-GHz bandwidth and CW condition. The HPA delivers more than 40-dBm power at about 2.5-dB gain compression and power-added efficiency (PAE) exceeding 36% in a 700-MHz bandwidth in pulsed operation. Its peak performance at the center of the band are 40.9-dBm output power and 45% PAE. These performance are obtained within tight de-rating conditions for space applications. © 2012 IEEE.


Lonac J.A.,MEC srl | Melczarsky I.,University of Bologna | Paganelli R.P.,CNR Institute of Electronics, Computer and Telecommunication Engineering
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010 | Year: 2010

A simple method for the full characterization of passive n-port MMIC structures using standard 2-port Vector Network Analyzer (VNA) measurements is presented. Its main advantages are: it does not require to perform measurements from all the ports of the network, no special calibration procedure is needed, the auxiliary terminations required by the procedure can be integrated at the border of the structure under test with minimal area increase, and it can be easily implemented in commercial CAD software. The method was applied to a 9-port microstrip structure corresponding to the output power combiner and impedance matching network of an X-band MMIC Power Amplifier (HPA). The full S-parameter matrix was derived from 2-port measurements and compared to circuit-as well as EM-based simulations of the structure. © 2010 EuMA.


Lonac J.A.,MEC Srl | Melczarsky I.,University of Bologna | Paganelli R.P.,CNR Institute of Electronics, Computer and Telecommunication Engineering
International Journal of Microwave and Wireless Technologies | Year: 2011

A simple method for the full characterization of passive n-port microwave monolithic integrated circuit (MMIC) structures using standard two-port vector network analyzer (VNA) measurements is presented. Its main advantages are: it does not require to perform measurements from all the ports of the network, no special calibration procedure is needed, the auxiliary terminations required by the procedure can be integrated at the border of the structure under test with minimal area increase, and it can be easily implemented in commercial CAD software. The method was applied to a nine-port microstrip structure corresponding to the output power combiner and impedance matching network of an X-band MMIC high power amplifier (HPA). The full S-parameter matrix was derived from two-port measurements and compared to the circuitâ€"as well as electromagnetic (EM)-based simulations of the structure. © 2011 Cambridge University Press and the European Microwave Association.


Resca D.,MEC Srl | Scappaviva F.,MEC Srl | Florian C.,University of Bologna | Rochette S.,Thales Alenia | And 4 more authors.
European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMIC 2013: 8th European Microwave Integrated Circuits Conference | Year: 2013

Besides the well known outstanding characteristics in terms of power density and thermal behavior, which are largely exploited for microwave high power applications, AlGaN/GaN HEMT technologies have demonstrated promising results for the design of low noise, high-dynamic-range and highly rugged amplifiers. In this paper we describe the design, implementation and characterization of a Ku-band MMIC Low Noise Amplifier for telecom Space applications, exploiting an industrial AlGaN/GaN 0.25 μm HEMT on SiC process. In the frequency band 12.8-14.8 GHz, the LNA features a linear gain over 20 dB with a Noise Figure below 1.85 dB. Input and output return losses are better than -9 dB in the same band. Power dissipation is 840 mW in linear operation. The LNA delivers about 25 dBm of output power at 1 dB compression point and it has been tested to survive without performance degradation 25 dBm of CW input power. © 2013 EuMA.


Raffo A.,University of Ferrara | Vadal V.,University of Ferrara | Di Falco S.,University of Ferrara | Scappaviva F.,MEC s.r.l | Vannini G.,University of Ferrara
2010 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, INMMiC 2010 - Conference Proceedings | Year: 2010

A new "hybrid" approach to microwave power amplifier design is presented which is based both on experimental large-signal low-frequency I/V load-line characterization and a model-based description of the device capacitances. Such a technique allows to get the same information obtained through nonlinear measurement setups operating at microwave frequencies. Several simulated and experimental data are proposed, based on GaN technology, in order to prove the effectiveness of the methodology. © 2010 IEEE.


Nalli A.,University of Ferrara | Raffo A.,University of Ferrara | Vannini G.,University of Ferrara | D'Angelo S.,University of Ferrara | And 5 more authors.
European Microwave Week 2014: Connecting the Future, EuMW 2014 - Conference Proceedings; EuMC 2014: 44th European Microwave Conference | Year: 2014

A scalable HEMT noise model has been developed, based on a lumped parasitic network extracted analytically through full-wave electromagnetic simulations and a scalable black-box representation of the intrinsic noise and AC response of the device. The analytical extraction of the lumped parasitic network is extensively explained, as well as the intrinsic model identification. The model prediction capability, in terms of S-parameters and noise performance, has been validated through the scaling of two different HEMTs. © 2014 European Microwave Association.


Resca D.,MEC Srl | Raffo A.,University of Ferrara | Di Falco S.,MEC Srl | Scappaviva F.,MEC Srl | And 2 more authors.
IEEE Microwave and Wireless Components Letters | Year: 2014

A X-band GaN monolithic microwave integrated circuits (MMIC) High Power Amplifier (HPA) suitable for future generation Synthetic Aperture Radar systems is presented. The HPA delivers 14 W of output power, more than 38% of PAE in the frequency bandwidth from 8.8 to 10.4 GHz. Its linear gain is greater than 25 dB. For the first time an MMIC X-band HPA has been designed by directly measuring the transistor behavior at the current generator plane. In particular, optimum device load-line has been selected according to the chosen performance tradeoffs. © 2014 IEEE.


Costantini A.,Consiglio Per La Ricerca In Agricoltura E Lanalisi Delleconomia Agraria Centro Of Ricerca Per Lenologia Crea Eno | Vaudano E.,Consiglio Per La Ricerca In Agricoltura E Lanalisi Delleconomia Agraria Centro Of Ricerca Per Lenologia Crea Eno | Cravero M.C.,Consiglio Per La Ricerca In Agricoltura E Lanalisi Delleconomia Agraria Centro Of Ricerca Per Lenologia Crea Eno | Petrozziello M.,Consiglio Per La Ricerca In Agricoltura E Lanalisi Delleconomia Agraria Centro Of Ricerca Per Lenologia Crea Eno | And 3 more authors.
European Food Research and Technology | Year: 2016

The aim of this work was to evaluate the effect on wine of dry ice blasting, used for the regeneration treatment of barriques, from a microbiological, chemical and sensory point of view. Microbiological analyses were performed on a laboratory model system and in small barrels to test the efficacy of dry ice blasting on the reduction in microbial loads. Subsequently, in order to study the chemical and sensory effects of dry ice blasting on wine, two barriques, used in the cellar, were used. One barrique was sulphited, as per common cellar practice, and one was cryosandblasted (R). After 6 months, the wines were compared. Data showed differences between the two wines concerning the volatile components. For instance, wine R had a statistically significant higher content of eugenol, cis-oak lactone and trans-oak lactone. These results were confirmed using sensory analysis, as wine R had an evident increase in intensity of boisé and vanilla notes. The advantages derived in using this method are the possibility of utilising a barrique, destined to be eliminated, for almost one more year, which is more sustainable from an economic and environmental point of view for the winemaker, and then the possibility to clean barrels reducing the use of SO2. © 2016 Springer-Verlag Berlin Heidelberg


A system and a process are described for the production of frozen carbon dioxide pellets in the solid form, in which a heat exchanger device is provided for the formation of pellets made from a container which houses a bundle of tubes, each having an inlet opening, in which carbon dioxide enters in the liquid state and each having an output opening from which the carbon dioxide comes out in the solid stale in the form of pellets. The container includes at least one inlet connection and at least one outlet connection for the circulation of a cooling fluid in the device and is divided into at least three sections separated and connected in series forming at least three zones with different temperatures.

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