Sökning: "varactor frequency multipliers"

Visar resultat 6 - 10 av 11 avhandlingar innehållade orden varactor frequency multipliers.

  1. 6. Heterostructure Barrier Varactors for High Efficiency Frequency Multipliers

    Författare :Lars Dillner; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; frequency multiplier; Heterostructure Barrier Varactor HBV ; millimeter wave; submillimeter wave; power source;

    Sammanfattning : This thesis describes the Heterostructure Barrier Varactor (HBV) and its application in frequency multipliers. Different HBV materials, fabrication processes, and device models are presented. The aim of this work is to improve the efficiency of HBV frequency multipliers. LÄS MER

  3. 7. Characterization of (Ba,Sr)TiO3 thin films for multiplier applications

    Författare :Pär Rundqvist; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; BSTO; THz; triplers; powerhandling capability; multilayer structures; frequency multipliers; Ferroelectric; BST; losses; Varactor; STO;

    Sammanfattning : (Ba,Sr)TiO3 (BSTO) and SrTiO3 (STO) parallel plate ferroelectric varactors are investigated for microwave multiplier applications.STO and BSTO exhibit low losses, high permittivity and largetunability of both permittivity and losses. All films are deposited using Pulsed Laser Deposition, magnetron sputtering and E-beam evaporation. LÄS MER

  4. 8. Modelling and design of high-power HBV multipliers

    Författare :Mattias Ingvarson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermal limitations; semiconductor; millimetre and sub-millimetre wave power source; varactor diode; frequency multiplier; heterostructure barrier varactor;

    Sammanfattning : This thesis deals with symmetric varactor frequency multipliers for millimetre and sub-millimetre wave applications. Much of the material presented is general and applicable to any type of (symmetric) varactor, but the focus is on the heterostructure barrier varactor (HBV). The basic function and principles of HBVs are explained. LÄS MER

  5. 9. Planar Heterostructure Barrier Varactor Diodes for Millimetre Wave Applications

    Författare :Jan Stake; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; millimetre- and sub-millimetre wave power source; III-V semiconductor; varactor diode; frequency multiplier; Heterostructure Barrier Varactor HBV ;

    Sammanfattning : This thesis deals with fabrication, characterisation and modelling of the Heterostructure Barrier Varactor (HBV) diode and its use in frequency multiplier applications. Different aspects of material structures and frequency multipliers are described. LÄS MER

  7. 10. Heterostructure Diodes for Millimeter Wave Power Generation

    Författare :Hans Grönqvist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Single barrier varactor diode; AlSb barrier; InAs substrate; high frequencies; Resonant Tunneling Diode;

    Sammanfattning : This thesis deals with two types of heterostructure diodes namely the Resonant Tunneling Diode (RTD) and the Single barrier varactor diode (SBV). The RTD is a device for high frequency generation either as a negative reistance oscillators or as a multiplier. Different means to reach high frequencies are outlined. LÄS MER