Search for dissertations about: "Frequency Selective Structure"

Showing result 1 - 5 of 34 swedish dissertations containing the words Frequency Selective Structure.

2. 1. Thick Frequency Selective Structures

   Author : Björn Widenberg; Institutionen för elektro- och informationsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustics; Elektromagnetism; optik; akustik; optics; Electromagnetism; Energy Saving Window; Radome; Finite Elemente Method; Frequency Selective Structure; Mode Matching Technique;

   Abstract : This thesis presents a new method that can handle a general thick Frequency Selective Structure (FSS), that consists of an arbitrary number of aperture layers and dielectric layers. The method is based on the Mode Matching Technique (MMT) and the finite element method (FEM). The thesis consists of a General Introduction and five scientific papers. READ MORE

4. 2. Frequency Selective Cold-Electron Bolometer Arrays

   Author : Sumedh Mahashabde; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; mm-wave detectors; Cold-Electron Bolometer; Frequency Selective Surface; Focal Plane array; OLIMPO; LSPE;

   Abstract : This work presents the integration of the Cold-Electron Bolometer (CEB) in Frequency Selective Surface (FSS) based arrays targeting balloon-borne telescope missions with high incident power requirements (typically tens of pW). FSS are planar frequency sensitive structures typically consisting of repeating pattern of a simple motif like square, circle, etc. READ MORE

5. 3. Scattering and propagation of electromagnetic waves in planar and curved periodic structures - applications to plane wave filters, plane wave absorbers and impedance surfaces

   Author : Ola Forslund; KTH; []
   Keywords : electromagnetic scattering; periodic structure; frequency selectiove structure; frequency selective surface;

   Abstract : The subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.Scattering from planar structures with two-dimensionalperiodic dependence of constitutive parameters is treated. READ MORE

6. 4. On the analysis of soft surfaces, frequency selective surfaces and con­formal antennas

   Author : Silvia Raffaelli; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; array; microstrip; antenna; dual-frequency; corrugated surface; multi-layer structure; periodic; horn; finite difference time domain; method of moments; spectral domain analysis; infinite;

   Abstract : .... READ MORE

7. 5. SiGeC Heterojunction Bipolar Transistors

   Author : Erdal Suvar; KTH; []
   Keywords : Silicon-Germanium-Carbon SiGeC ; Heterojunction bipolar transistor HBT ; chemical vapor deposition CVD ; selective epitaxy; non-selective epitaxy; collector design; high-frequency measurement; dopant segregation; thermal stability;

   Abstract : Heterojunction bipolar transistors (HBT) based on SiGeC havebeen investigated. Two high-frequency architectures have beendesigned, fabricated and characterized. Different collectordesigns were applied either by using selective epitaxial growthdoped with phosphorous or by non-selective epitaxial growthdoped with arsenic. READ MORE