Sökning: "phase shift capability"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden phase shift capability.

  1. 1. Programmable and Tunable Circuits for Flexible RF Front Ends

    Författare :Naveed Ahsan; Aziz Ouacha; Sten Gunnarsson; Linköpings universitet; []
    Nyckelord :Microwave circuits; phase shifters; programmable circuits; active corporate feed network; four-port circuit; generic cells; phase shift capability; programmable microwave function array; tunable recursive filter; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Most of today’s microwave circuits are designed for specific function and specialneed. There is a growing trend to have flexible and reconfigurable circuits. Circuitsthat can be digitally programmed to achieve various functions based on specific needs. LÄS MER

  3. 2. Optical Transmission Systems Based on Phase-Sensitive Amplifiers

    Författare :Samuel L I Olsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optical injection locking; fiber nonlinearities; optical fiber communication; fiber nonlinearity mitigation; four-wave mixing; fiber optic parametric amplification; low-noise amplification; phase-sensitive amplification; fibre optics;

    Sammanfattning : The capacity and reach of today's long-haul fiber optical communication systems is limited by amplifier noise and fiber nonlinearities. Conventional, phase-insensitiveamplifiers (PIAs), have a quantum limited noise figure (NF) of 3 dB at high gain, meaning that with a shot-noise limited input signal the signal-to-noise ratio (SNR)is degraded by at least 3 dB. LÄS MER

  4. 3. Nematic Liquid Crystal Spatial Light Modulators for Laser Beam Steering

    Författare :Emil Hällstig; Mikael Lindgren; Lars Sjöqvist; William Crossland; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; spatial light modulator; liquid crystal; beam steering; tracking; phase modulation; fringing field; director distribution; finite-difference time-domain; polarization; temporal properties; Fysik; Physics; Fysik;

    Sammanfattning : Laser beam control is important in many applications. Phase modulating spatial light modulators (SLMs) can be used to electronically alter the phase distribution of an optical wave-front and thus change the direction and shape of a laser beam. LÄS MER

  5. 4. Novel RF MEMS Devices for W-Band Beam-Steering Front-Ends

    Författare :Nutapong Somjit; Joachim Oberhammer; Pierre Blondy; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis presents novel millimeter-wave microelectromechanical-systems (MEMS) components for W-band reconfigurable beam-steering front-ends. The proposed MEMS components are novel monocrystalline-silicon dielectric-block phase shifters, and substrate-integrated three-dimensional (3D) micromachined helical antennas designed for the nominal frequency of 75 GHz. LÄS MER

  7. 5. Attosecond information encoded in the photoemission angle

    Författare :Johanna Sörngård; Eva Lindroth; Jan-Petter Hansen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; attosecond; photoemission; delay; circular polarization; angular dependence; asymmetry parameters; attosekund; fotoemission; fördröjning; cirkulärpolarisation; vinkelberoende; asymmetriparametrar; Theoretical Physics; teoretisk fysik;

    Sammanfattning : Electrons that break free during photoionization acquire a phase shift induced by the many-body potential of the parent ion. This phase shift can be interpreted as a delay in the photoionization process. LÄS MER