Sökning: "modulator"

Visar resultat 1 - 5 av 209 avhandlingar innehållade ordet modulator.

  1. 1. Design and Characterization of D-band Monolithic Direct Carrier Modulator and Demodulator Circuits for High Speed Wireless Communication

    Författare :Sona Carpenter; Chalmers University of Technology; []
    Nyckelord :modulator; MMIC; Double-Heterojunction Bipolar Transistor DHBT ; demodulator; balun; D-band; InP; Gilbert cell; Quadrature; differential coupler;

    Sammanfattning : Millimeter waves are finding increasing applications in data communication, sensing,imaging and radio astronomy. One application is in high-speed wireless back-haul networksfor mobile communication. The operators are interested in replacing optical fiber withthe more flexible and easy to deploy wireless link. LÄS MER

  2. 2. Design, Fabrication and Analysis of InP-InGaAsP Traveling-Wave Electro-Absorption Modulators

    Författare :Stefan Irmscher; KTH; []
    Nyckelord :fiber-optic communication; modulator; electroabsorption; traveling-wave; InP; broad-band modulation;

    Sammanfattning : External modulators will become key components in fiberoptical communica- tion systems operating at 40Gbit/s andhigher bitrates. Semiconductor electro- absorption (EA)modulators are promising candidates because of their high-speed potential, and their process compatibility with thecorresponding semi- conductor laser light sources. LÄS MER

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

    Författare :Martin Löfgren; Chalmers University of Technology; []
    Nyckelord :distortion; penetration depth; surface resistance; transmit-receive switch; coupled-grain model; high-power; microwave; pulse; surface impedance; breakdown; propagation; modulator; air; superconductor; transmission line; resonator; coplanar waveguide; plasma;

    Sammanfattning : 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. LÄS MER

  4. 4. Resistin is a modulator of inflammation and autoimmunity

    Författare :Elisabeth Almer Boström; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :Resistin; inflammation; autoimmunity; rheumatoid arthritis; Sjögren s syndrome;

    Sammanfattning : Resistin is a protein with proinflammatory properties in man and a regulator of glucose metabolism in mice. Human resistin activates the nuclear factor kappa-B dependent cytokine cascade; however, its full role in inflammation in terms of regulation, expression, and cellular source is not entirely understood. LÄS MER

  5. 5. Biglycan as a modulator of fibrous connective tissue

    Författare :Ellen Tufvesson; Lund Lungmedicin och Allergologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; biglycan decorin fibroblast interleukin-1beta migration proteoglycan structure tumour necrosis factor-alpha; Medicine human and vertebrates ; Medicin människa och djur ;

    Sammanfattning : Fibrous connective tissue contains fibroblasts distributed in a complex network of extracellular matrix molecules, such as proteoglycans. The small proteoglycans biglycan and decorin are composed of a protein core substituted with two and one glycosaminoglycan (GAG) chain, respectively. LÄS MER