Search for dissertations about: "ferroelectrics"

Showing result 1 - 5 of 26 swedish dissertations containing the word ferroelectrics.

  1. 1. Tunable Filters based on Ferroelectrics and Semiconductor Varactors

    Author : Anders Eriksson; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ferroelectrics; KTaO3; phase transition; dual mode filter; Cu BCB multilayer; tunable filter; quality factor; circular disc resonator; High Temperature Superconductor HTS ; SrTiO3;

    Abstract : 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. READ MORE

  2. 2. Tunable resonators and filters based on bulk single crystal incipient ferroelectrics

    Author : Anders Eriksson; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dual mode filter; tunable filter; STO; ferroelectrics; High Temperature Superconductor HTS ; KTO; phase transition; quality factor; circular single crystal disc resonator;

    Abstract : .... READ MORE

  3. 3. Multifunctional Supramolecular Organic Ferroelectrics

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Indre Urbanaviciute; Martijn Kemerink; Mats Fahlman; Bengt-Harald Jonsson; Van Dijken Sebastiaan; [2019]

    Abstract : Ferroelectric materials are known and valued for their multifunctionality arising from the possibility to perturb the remnant ferroelectric polarization by electric field, temperature and/or mechanical stimuli. While inorganic ferroelectrics dominate the current market, their organic counterparts may provide highly desired properties like eco-friendliness, easy processability and flexibility, concomitantly opening unique opportunities to combine multiple functionalities into a single compound that facilitates unprecedented device concepts and designs. READ MORE

  4. 4. Ferroelectric Na0.5K0.5NbO3 as an electro-optic material

    University dissertation from Kista : Mikroelektronik och informationsteknik

    Author : Mats Blomqvist; [2002]
    Keywords : ferroelectrics; sodium potassium niobates; thin films; rf-magnetron sputtering; waveguiding; refractive index; prism coupling; dielectric tunability;

    Abstract : Ferroelectrics are a group of advanced electronic materialswith a wide variety of properties useful in applications suchas memory devices, resonators and filters, infrared sensors,microelectromechanical systems, and optical waveguides andmodulators. Among the oxide perovskite-structured ferroelectricthin film materials sodium potassium niobate or Na0. READ MORE

  5. 5. High Temperature Superconducting and Tunable Ferroelectric Microwave Devices

    University dissertation from Kista : Mikroelektronik och informationsteknik

    Author : Erik F. Carlsson; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; varactors; tunable microwave circuits; conformal mapping; cryogenic probe station; ferroelectrics; high temperature superconductors; microwave circuits; narrow-band filters; phase-shifter;

    Abstract : This thesis addresses some applications of High Temperature Superconductors (HTS) and ferroelectric materials in tunable microwave devices and circuits. The work is divided into three main areas: i) modeling of multilayered structures including ferroelectric layers, ii) realization and characterization of tunable coplanar waveguides (CPW), capacitors and resonators based on ferroelectrics, and iii) an investigation of microstrip HTS K-band filters. READ MORE