Search for dissertations about: "microwave transmission"

Showing result 1 - 5 of 65 swedish dissertations containing the words microwave transmission.

  1. 1. Device Technology Based on High Temperature Superconductors and Microwave Breakdown in Gases

    University dissertation from Chalmers University of Technology

    Author : Martin Löfgren; Chalmers tekniska högskola.; Chalmers University of Technology.; [1995]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; microwave; surface resistance; surface impedance; resonator; superconductor; penetration depth; transmission line; coplanar waveguide; modulator; coupled-grain model; high-power; breakdown; plasma; pulse; transmit-receive switch; distortion; propagation; air;

    Abstract : This thesis deals with two separate fields of microwave technology. The first section treats microwave characterization and applications of high temperature superconducting (HTS) thin films, while the second section treats microwave breakdown in transmit-receive (TR) switches and in air. Within the first section, four main topics are adressed. READ MORE

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

    University dissertation from Chalmers University of Technology

    Author : Erik F. Carlsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; high temperature superconductors; ferroelectrics; microwave circuits; narrow-band filters; tunable microwave circuits; varactors; phase-shifter; conformal mapping; cryogenic probe station;

    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

  3. 3. Microwave Breakdown in Inhomogeneous Fields

    University dissertation from Chalmers University of Technology

    Author : Joel Rasch; Chalmers tekniska högskola.; Chalmers University of Technology.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; Plasmafysik med fusion; Plasma physics with fusion; Microwave breakdown; multipactor; corona; inhomogeneous fields;

    Abstract : Microwave breakdown continues to be a risk in many applications involving the transmission and reception of microwave frequency signals. Satellite communication is especially interesting from the research point of view because of the extreme costs, and limited testing possibilities. READ MORE

  4. 4. Theory and Design of Wideband Doherty Power Amplifiers

    University dissertation from Chalmers University of Technology

    Author : David Gustafsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektronik; Electronics; Elektroteknik; Electrical engineering; Broadband amplifiers; Doherty; gallium nitride; GaN; high efficiency; microwave; MMIC; power amplifier; wideband;

    Abstract : The Doherty power amplifier (DPA) is one of the most popular power amplifier architectures for obtaining high average efficiency for modern communication signals with high peak-to-average power ratios (PAPR). However, the DPA suffers from often having narrowband performance which limits its capabilities in wideband and/or multi-standard microwave and radio frequency applications. READ MORE

  5. 5. Engineering and detecting microwave photons

    University dissertation from Chalmers University of Technology

    Author : Sankar Raman Sathyamoorthy; Chalmers tekniska högskola.; Chalmers University of Technology.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum optics; circuit QED; microwave photon detection; cross-Kerr effect; tunable cavity; open quantum systems.;

    Abstract : Microwave quantum optics using superconducting circuits, also known as circuit QED, is a recent and promising field to study light-matter interactions at the fundamental level. In this field, artificial atoms made of superconducting elements interact with microwave photons routed through one dimensional transmission lines. READ MORE