Sökning: "millimeter wave devices"

Visar resultat 11 - 15 av 42 avhandlingar innehållade orden millimeter wave devices.

  1. 11. Integrated Variable-Gain and CMOS Millimeter-Wave Amplifiers

    Författare :Mohammad Anowar Masud; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LNA; MMIC; FinFET; CMOS; HEMT; GaAs; WLP; VGA; BCB;

    Sammanfattning : Variable Gain Amplifier finds extensive use in the high frequency demonstrators specially those operating in the millimeter-wave regions and beyond where the incoming RF signal level can have wide variations. To maintain a constant signal level an IF VGA has been designed that can offer a dynamic variation of gain as much as 45 dB together with a high maximum gain and a low noise figure. LÄS MER

  3. 12. Mixer, Multiplier and Passive Components for Low Noise THz Receivers

    Författare :Bhushan Billade; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; millimeter wave receivers; Superconductor-Insulator-Superconductor SIS mixers; thin-film circuits.; superconducting devices; quasi-particle mixers; frequency multiplier;

    Sammanfattning : This thesis presents the work done in the field of development of low noise instruments for radio astronomy applications, and addresses some of the key components in the receiver. Part of this thesis describes the design and development of a Superconductor-Insulator-Superconductor (SIS) junction mixer covering RF frequencies from 163 to 211 GHz, reaching the quantum limited noise performance. LÄS MER

  4. 13. Waveguide-Integrated MEMS Concepts for Tunable Millimeter-Wave Systems

    Författare :Zargham Baghchehsaraei; Joachim Oberhammer; Tauno Vähä-Heikkilä; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis presents two families of novel waveguide-integrated components based on millimeter-wave microelectromechanical systems (MEMS) for reconfigurable systems. The first group comprises V-band (50–75 GHz) and W-band (75–110 GHz) waveguide switches and switchable irises, and their application as switchable cavity resonators, and tunable bandpass filters implemented by integration of novel MEMS-reconfigurable surfaces into a rectangular waveguide. LÄS MER

  5. 14. Heterostructure Field Effect Transistors and Millimeter Wave Integrated Circuits

    Författare :Niklas Rorsman; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; subharmonic; resistive mixer; Modulation Doped Field Effect Transistor MODFET ; heterostructure field effect transistor HFET ; monolithic microwave integrated circuits MMIC ; frequency multiplier; amplifier; III-V semiconductor; small signal model; electron beam lithography; High Electron Mobility Transistor HEMT ; large signal model; pseudomorphic;

    Sammanfattning : This thesis deals with the research and development of HFETs and HFET based circuits. One of the main aims of the work presented in this thesis has been to develop processes to fabricate state of the art devices and circuits. LÄS MER

  7. 15. Optimization and Fundamental Insights in Full-Duplex Cellular Networks

    Författare :Jose Mairton B. da Silva Jr.; Carlo Fischione; Gabor Fodor; Geoffrey Ye Li; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; full-duplex; optimization; power control; assignment; beamforming; millimeter wave; self-interference; multi-antenna; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The next generations of cellular networks are expected to provide explosive data rate transmissions and very low latencies. To meet such demands, one of the promising wireless transmissions candidates is in-band full-duplex communications, which enable wireless devices to simultaneously transmit and receive on the same frequency channel. LÄS MER