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  • 1
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    Full-Band Oversized Turnstile-Based Waveguide Four-Way Power Divider/Combiner for High-Power Applications (2019)
    Molecular Diversity Preservation International
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    Publication Date: 2019-02-07
    Description: Very high-power and high-efficiency microwave applications require waveguide structures to combine/divide the power from/to a variable number of high-power solid-state devices. In the literature, among the different waveguide configurations, those capable of providing the maximum output power show a limited relative bandwidth. To overcome this limitation, in this paper a full-band (40%) waveguide power divider/combiner specifically designed for high-power applications (up to several kW) is presented. The proposed structure uses an evolved turnstile junction with a standard rectangular waveguide common port, rotated 45°, with respect to its central axis, to divide/combine the signal to/from the four output/input rectangular ports. The inclusion of an oversized central cavity together with circular and rectangular waveguide impedance transformers at the common port allows the achievement of a full-band operation with excellent electrical performance, while maintaining a very simple and compact configuration. Only two layers of metal are required for the physical implementation of this structure in platelet configuration. A prototype has been designed covering the full Ka-band (26.5–40 GHz), showing an excellent measured performance with around 30 dB of return loss, 0.18 dB of insertion loss, and less than 1.5° of phase imbalance.
    Electronic ISSN: 2079-9292
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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  • 2
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    S-Band Class-C-F Power Amplifier with 2nd Harmonic Control at the Input (2019)
    Molecular Diversity Preservation International
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    Publication Date: 2019-12-29
    Description: Power amplifiers (PAs) are the most power-consuming devices in a transmitter. Their performance in efficiency is crucial to the efficiency of the whole system. Therefore, the issue of high efficiency PA has remained hot over the years. This paper presents an approach to design an S-band single stage class-F PA biased in class-C condition. Through the manipulation of the 2nd harmonic at the input, shaping the voltage waveform at the gate node, a class-F PA with proper output matching network (OMN) is realized. The proposed class-C-F PA achieved 60% drain efficiency (DE) and 36.3 dBm of output power around the 3 dB compression point. The methodology of taking the input non-linearity into consideration is also presented. Its feasibility has been verified through both the design and measurements.
    Electronic ISSN: 2076-3417
    Topics: Natural Sciences in General
    Published by Molecular Diversity Preservation International
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  • 3
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    High Performance Asymmetric Coupled Line Balun at Sub-THz Frequency (2019)
    Molecular Diversity Preservation International
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    Publication Date: 2019-05-09
    Description: In this paper, we report a high-performance balun with characteristics suitable for future broadband sub-THz differential circuits. The idea of the balun is based on three asymmetric coupled lines, which enhance the odd mode capacitances to equalize the even/odd mode phase velocities. The inner line of the three asymmetric coupled lines is configured to form the open stub ( λ /2), while the outer lines form short stubs ( λ /4). To further reduce the phase imbalance, the short stubs in one of the arms of the balun are connected with vias and a lower metal layer. The balun is developed using the standard 130-nm SiGe BiCMOSback-end process and EM simulated with ADS momentum and Sonnet. The −10-dB reflection coefficient (S 11 ) bandwidth of the balun is 136 GHz (88–224 GHz). It shows insertion loss (including RF pads)
    Electronic ISSN: 2076-3417
    Topics: Natural Sciences in General
    Published by Molecular Diversity Preservation International
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  • 4
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    S Band Hybrid Power Amplifier in GaN Technology with Input/Output Multi Harmonic Tuned Terminations (2021)
    Molecular Diversity Preservation International
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    Publication Date: 2021-09-21
    Description: In this paper, the design, fabrication, and measurements of an S band multi harmonic tuned power amplifier in GaN technology is described. The amplifier has been designed by exploiting second and third harmonic tuning conditions at both input and output ports of the active device. The amplifier has been realized in a hybrid form, and characterized in terms of small and large signal performance. An operating bandwidth of 300 MHz around 3.55 GHz, with 42.3 dBm output power, 9.3 dB power gain and 53.5% power added efficiency PAE (60% drain efficiency) at 3.7 GHz are measured.
    Electronic ISSN: 2079-9292
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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  • 5
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    A Comprehensive Harmonic Analysis of Current-Mode Power Amplifiers (2021)
    Molecular Diversity Preservation International
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    Publication Date: 2021-10-28
    Description: This work presents a comprehensive theoretical analysis of current-mode power amplifiers as a function of input power for different biasing classes under the common simplifying assumption of constant transconductance and hard current cut-off/saturation. Typically, the theoretical analysis of power amplifier performance and behavior are carried out only at maximum output power. However, to achieve high data-rates, modern telecommunication systems adopt signals characterized by a very high peak-to-average power ratio, thus it is useful to analyze the power amplifier behavior as a function of power back-off. Moreover, in many cases, to enhance the efficiency and/or to apply harmonic shaping techniques, a clipped drain-source current, which approaches a square wave, is required. The classical analysis can be extended to low power levels only under the assumption of power-independent conduction angle, which is true only for class-A and class-B amplifiers, and does not take into account possible waveform clipping at maximum current. This work presents a complete theoretical Fourier analysis of FET-based power amplifiers as a function of quiescent drain-source current at any input power level and accounting for the clipped current case, up to the square-wave limit, reorganizing and completing the material that can be found in classical textbooks in the field.
    Electronic ISSN: 1996-1073
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 6
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    Antenne Integrate Attive (2022)
    Firenze University Press
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    Publication Date: 2024-04-05
    Description: Antenne Integrate Attive (“Active Patch Antennas”) represents the first issue of the series «Quaderni del Dottorato di Ricerca in Ingegneria dell’Informazione» ("Issues of the PhD course in Information Engineering”) of the University of Florence, used as a didactic support to the PhD course bearing the same name. Active patch antennas, object of the publication and introduced as the enabling technology for high performance multifunctional front-ends for radar and communication systems, are currently also being used for Personal Area Networks (PAN) and for Dedicated Short Range Communication (DSRC), at a low cost and power. In the arrays for space applications, where reliability is a key aspect, the approach to distributed active elements allows the improvement of the entire system’s defect tolerance. The issue is organized into six chapters. The first three chapters present the basic concepts related to radio links, the definition of the used parameters and their involvement in the constitutive relationships. In the fourth and fifth chapters, the design methods of the main antenna configurations are discussed, and some examples of application are provided. Finally, chapter six reviews the analysis methods used in modern software for electromagnetic and microwave circuit simulation.
    Keywords: thema EDItEUR::P Mathematics and Science::PH Physics::PHK Electricity, electromagnetism and magnetism ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBM Instruments and instrumentation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TH Energy technology and engineering::THR Electrical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJF Electronics engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJK Communications engineering / telecommunications ; thema EDItEUR::U Computing and Information Technology::UM Computer programming / software engineering::UMZ Software Engineering ; thema EDItEUR::U Computing and Information Technology::UT Computer networking and communications
    Language: Italian
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