Search for dissertations about: "reflector antenna"

Showing result 1 - 5 of 23 swedish dissertations containing the words reflector antenna.

  2. 1. Design of hat fed reflector antennas using FDTD

    Author : Jian Yang; Per-Simon Kildal; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; soft and hard surfaces; finite difference time domain FDTD method; sperture efficiencies; Gaussian vertex plate; corrugations; edge corrugations; hat feed antenna; phase center; vertex plate; ring-focus paraboloid; paraboloid; V2D code; ring-shaped phase center; BOR1 antenna; reflector shaping; reflector antenna;

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  4. 2. Design and Optimization of Wideband Hat-Fed Reflector Antenna with Radome for Satellite Earth Station

    Author : Erik G Geterud; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Antenna feeds; satellite earth stations.; optimization; corrugated surfaces; radomes; reflector antennas;

    Abstract : This thesis presents the development of a hat-fed refector antenna with radome to be used as satellite earth station. The antenna with self supported feed is relatively compact, circular symmetric and with low cross polarization. To achieve optimum performance over the satellite Ku-band,covering 10.75-14. READ MORE

  5. 3. Modern numerical methods in electromagnetics applied to the design of reflector antennas and horn feeds

    Author : Martin Johansson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; reflector antenna; cluster feed; offset; dual-reflector feed; mode matching; very long baseline interferometry; circular waveguide; diffraction; physical optics; corrugated horn; coaxial waveguide; VLBI; dual-frequency; low noise; finite element method; ray tracing; dual-band;

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  6. 4. Moment Method Analysis of Antennas on Cylindrical Structures by Using G2DMULT and Design of Hat Fed Reflector Antennas

    Author : Jian Yang; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; G2DMULT; reflector antenna; paraboloid; dipole; base station antenna; screw heads; vertex plate; self impedance; G1DMULT; ring-shaped phase center; radiation efficiency; FDTD; cylindrical structures; V2D; ring-focus; moment method;

    Abstract : This thesis deals with two aspects of research interest: moment method analysis of antennas on cylindrical structures by using G2DMULT, and design of hat fed reflector antennas. Both of them are two-dimensional (2D) structure problems, one being cylindrical and the other rotationally symmetric. READ MORE

  7. 5. Digital Beamforming Focal Plane Arrays for Radio Astronomy and Space-Borne Passive Remote Sensing

    Author : Oleg Iupikov; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; beamforming; spaceborne radiometers; radio telescopes; phased array feeds; reflector antenna feeds; feed-reflector interaction;

    Abstract : Dense Phased Array Feeds (PAFs) for reflector antennas have numerous advantages over traditional cluster feeds of horns in a one-horn-per-beam configuration, especially in RF-imaging applications which require multiple simultaneously formed and closely overlapping beams. However, the accurate analysis and design of such PAF systems represents a challenging problem, both from an EM-modeling and beamforming optimization point of view. READ MORE