Search for dissertations about: "cylindrical structure"

Showing result 1 - 5 of 54 swedish dissertations containing the words cylindrical structure.

  1. 1. Analysis of Dipole and Patch Antennas in Cylindrical Structures

    University dissertation from Chalmers University of Technology

    Author : Peter Slättman; Chalmers tekniska högskola.; Chalmers University of Technology.; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; antenna; dipole; slot; patch; cylindrical; EFIE; arbitrary; cross-section; Fourier transform; moment method; aperture coupled; trough guide;

    Abstract : This thesis deals with the analysis of dipoles, patches, and aperture coupled patches located in an infinitely long cylindrical structure with arbitrary cross-section. The analysis exploits the two-dimensional nature of the structure by expanding all fields and currents in spatial harmonics along the cylinder axis, and solving the subsequent spectral two-dimensional problems by the moment method. READ MORE

  2. 2. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

    University dissertation from Chalmers University of Technology

    Author : Ulf Carlberg; Chalmers tekniska högskola.; Chalmers University of Technology.; [2004]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; antenna; moment method; reverberation chamber; cylindrical structure; spectral domain method; Ewald summation; Green s function; absorption cross section; cavity;

    Abstract : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberation chambers, and a study of antennas in cylindrical structures. The reverberation chamber is a metal cavity for measuring antennas and other devices. READ MORE

  3. 3. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

    University dissertation from Chalmers University of Technology

    Author : Ulf Carlberg; Chalmers tekniska högskola.; Chalmers University of Technology.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; antenna; moment method; reverberation chamber; cylindrical structure; spectral domain method; Ewald summation; Green s function; absorption cross section; cavity;

    Abstract : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberation chambers and a study of antennas in cylindrical structures. The reverberation chamber is a metal cavity for measuring antennas and other devices. READ MORE

  4. 4. Ternary Block Copolymer - Water - "Oil" Systems: Effects of "Oil" Type and Block Size on Phase Behaviour and Structure

    University dissertation from Chalmers University of Technology

    Author : Peter Holmqvist; Lunds universitet.; Lund University.; [1997]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; poly propylene oxide ; poly ethylene oxide ; poloxamer; micelles; lyotropic liquid crystals; SAXS; structure; phase behavior; self-assembly; block copolymers; amphiphiles; poly tetrahydrofurane ; Physical chemistry; Fysikalisk kemi;

    Abstract : It has recently been established in our group that amphiphilic block copolymers consisting of a hydrophilic and a hydrophobic part can self-assemble in the presence of selective solvents (“water” and “oil”) into a variety of different solution and lyotropic liquid crystalline microstructures. The effects of the “oil” type, hydrophilic block size and hydrophobic block type on the phase behavior and microstructure of ternary isothermal copolymer - oil - water systems have been addressed in this thesis. READ MORE

  5. 5. Cylindrical Waveguide Slot Antenna Analysis

    University dissertation from Chalmers University of Technology

    Author : Johan Wettergren; Chalmers tekniska högskola.; Chalmers University of Technology.; [1997]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; Informationsteknik; Information technology; antenna; basis function; cylinder; EFIE; integral equation; moment method; MPIE; mutual admittance; mutual coupling; slot; waveguide;

    Abstract : Waveguide slot antennas with longitudinal and transverse slots are analyzed using a rigorous method. The antennas are divided into regions, which are analyzed separately and matched by a moment method procedure. At the apertures between the regions, the electric fields are expanded in trigonometric basis functions. READ MORE