Sökning: "varactors"

Visar resultat 6 - 10 av 28 avhandlingar innehållade ordet varactors.

  1. 6. Ferroelectric Na₀₅̣ K₀₅̣ NbO₃ varactors for microwave applications

    Författare :Saeed Abadei; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tunable microwave device; integrated ferroelectric device; NKN; ferroelectric varactor; Na₀₅̣ K₀₅̣ NbO₃; ferroelectric;

    Sammanfattning : .... LÄS MER

  3. 7. 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

  4. 8. Tunable Filters based on Ferroelectrics and Semiconductor Varactors

    Författare :Anders Eriksson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High Temperature Superconductor HTS ; quality factor; tunable filter; phase transition; circular disc resonator; Cu BCB multilayer; KTaO3; ferroelectrics; dual mode filter; SrTiO3;

    Sammanfattning : Experimental investigation and development of tunable microwave filters, based on single crystals of SrTiO3 (STO) and KTaO3 (KTO), form the main work of this thesis. The dielectric properties of STO and KTO crystals are evaluated experimentally for a wide temperature range, with a DC bias, using parallel-plate resonators with High Temperature Superconductor (HTS) and normal metal (Cu) electrodes. LÄS MER

  5. 9. Perovskite oxides for parallel plate ferroelectric varactors / Pär Rundqvist

    Författare :Pär Rundqvist; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  7. 10. Piezoelectric and ferroelectric device technologies for microwave oscillators

    Författare :Martin Norling; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piezoelectrics; electrostrictive materials; microwave oscillators; thin film devices; ferroelectrics; thin film bulk acoustic resonators; ferroelectric varactors;

    Sammanfattning : The purpose of this thesis is to investigate piezoelectric and ferroelectric thin film device technologies for application in microwave oscillators.Thin film varactors based on ferroelectric materials are considered. LÄS MER