Sökning: "S-parameter measurements"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden S-parameter measurements.

  1. 1. Characterisation of terahertz integrated membrane circuits

    Författare :Johanna Hanning; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; waveguide width error; calibration; THz; membrane circuit; TRL; measurement uncertainty; single-flange 2-port; 220–325 GHz; cable flex; WR-03; VNA; S-parameter;

    Sammanfattning : In this thesis a novel measurement setup and thru-reflect-line (TRL) calibration kit for vector network analyser (VNA) measurements at 220 GHz to 325 GHz (WR-03) is presented. Measurements on passive membrane circuit devices under test (DUTs) show improvement in the S-parameters compared to a waveguide integrated membrane circuit setup in previous work, especially in reducing the ripples and increasing repeatability of the measurements. LÄS MER

  2. 2. Advanced Schottky Diode Receiver Front-Ends for Terahertz Applications

    Författare :Peter Sobis; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; terahertz electronics; TRL-calibration; frequency converters; down converters; phase shifters; S-parameter measurements; Schottky diodes; subharmonic mixers; radiometers; terahertz technology; submillimetre wave technology; heterodyne receivers; differential phase shifters; sideband separating mixers;

    Sammanfattning : This thesis treats the development of high frequency circuits for increased functionality of terahertz receiver front-ends based on room temperature Schottky diode technology. This includes the study of novel circuit integration schemes, packaging concepts as well as new measurement and characterisation techniques. LÄS MER

  3. 3. Resonant Microwave Sensors for Industrial Applications

    Författare :Johan Nohlert; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite element method; eigenvalue problems; microwave resonances; parameter estimation; process monitoring; microwave measurements; detection;

    Sammanfattning : This thesis presents developments in the area of microwave-based sensor systems for industrial applications. The work is motivated by a need for advanced measurement techniques in industry in general, and the process industry in particular. LÄS MER

  4. 4. Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables

    Detta är en avhandling från Stockholm : KTH

    Författare :Ruslan Papazyan; KTH.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical power technology; Attenuation measurement; cross-linked polyethylene insulation; discontinuities; localization; mass-impregnated insulation; numerical analysis; parameter estimation; power cable metallic screen; scattering parameters; time domain reflectometry; velocity measurements; water treeing; Elkraftteknik; TECHNOLOGY Electrical engineering; electronics and photonics Electric power engineering; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elkraftteknik;

    Sammanfattning : Time Domain Reflectometry (TDR) has been used for localization of transmission line discontinuities in diverse applications. Various challenges have to be addressed when applying TDR for localization of insulation degradation in power cables. LÄS MER

  5. 5. Design and development of a microwave multifrequency polarimetric scatterometer for biosphere remote sensing

    Detta är en avhandling från Kiruna : Institutet för rymdfysik

    Författare :Anders Stjernman; Umeå universitet.; [1995]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polarimetry; scatterometer; microwave remote sensing; calibration; network analyzer based; S-parameters; scattering matrix;

    Sammanfattning : Microwave radar and radiometer techniques are used to gather crucial information about the earth and its atmosphere. The ERS-1, JERS-1, RadarSAT and NASA’s Mission to Planet Earth projects are designed to study the changing global environment. In all these endeavors, the key instrument is the radar or scatterometer. LÄS MER