Search for dissertations about: "FSS"

Showing result 1 - 5 of 19 swedish dissertations containing the word FSS.

  2. 1. Stealth radomes

    Author : Sören Poulsen; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electromagnetic scattering; Dichroic structures; Frequency selective surface; Elektroteknik; FSS; Electrical engineering; Radomes;

    Abstract : This dissertation deals with periodic structures that are used as free-space electromagnetic filters. Two types of periodic structures are treated, namely the so called frequency selective surface (FSS) and the artificial puck plate (APP) structure. READ MORE

  4. 2. 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

  5. 3. Fertility-sparing surgery in young women with ovarian cancer and borderline ovarian tumors

    Author : Gry Johansen; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Background: Based on the cell origin of the tumor, ovarian cancer (OC) is divided in epithelial ovarian cancer (EOC), including borderline ovarian tumors (BOT), and nonepithelial ovarian cancer (NEOC), which includes sex cord stromal tumors and malignant ovarian germ cell tumors. Each subgroup contains several histological subtypes of varying malignant potential and prognosis. READ MORE

  6. 4. 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

  7. 5. On the Scattering Reduction of an Aircraft Wing Profile Enclosing an Antenna

    Author : Alireza Motevasselian; Lars Jonsson; Daniel Sjöberg; KTH; []
    Keywords : ;

    Abstract : In this thesis we study the radar cross section reduction and transparency of anantenna radome placed in the front part of an aircraft wing. The antenna, notstudied here, is a linearly polarized antenna operating at 1 GHz with abandwidth of 30%. READ MORE