Search for dissertations about: "MHz Frequency"

Showing result 1 - 5 of 152 swedish dissertations containing the words MHz Frequency.

2. 1. High Frequency (MHz) Resonant Converters using GaN HEMTs and Novel Planar Transformer Technology

   Author : Hari Babu Kotte; kent Bertilsson; Bengt Oelmann; Noel Shammas; Torbjörn Thiringer; Per Karlsson; Mittuniversitetet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GaN HEMTs; MHz Frequency; Resonant Converters; Planar Transformer Technology;

   Abstract : The increased power consumption and power density demands of moderntechnologies have increased the technical requirements of DC/DC and AC/DC powersupplies. In this regard, the primary objective of the power supply researcher/engineeris to build energy efficient, high power density converters by reducing the losses andincreasing the switching frequency of converters respectively. 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. High Frequency (MHz) Planar Transformers for Next Generation Switch Mode Power Supplies

   Author : Radhika Ambatipudi; Kent Bertilsson; Bengt Oelmann; Jesus Doval Gandoy; Hans-Peter Nee; Torbjörn Thiringer; Göran Thungström; Mittuniversitetet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Planar Magnetics; DC-DC Converters; Switch Mode Power Supplies; MHz Frequency Region;

   Abstract : Increasing the power density of power electronic converters while reducing or maintaining the same cost, offers a higher potential to meet the current trend inrelation to various power electronic applications. High power density converters can be achieved by increasing the switching frequency, due to which the bulkiest parts, such as transformer, inductors and the capacitor's size in the convertercircuit can be drastically reduced. READ MORE

6. 4. High frequency electronic packaging : SBU-materials, material characterization, simulation and processing

   Author : Christian Johansson; Hjalmar Hesselbom; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; dielectric loss; high frequency electrical characterization; microwave circuits; multilayer thin film technology; ORMOCER; permittivity; sequential build up; silicone elastomer;

   Abstract : Electronic packaging continues to move towards improved performance and lower cost. Requirements of higher performance, reduced size, weight and cost of both High Density Interconnects (HDI) and high frequency (HF) devices has led to the search for new: materials, material combinations, methods, processes and production equipment. READ MORE

7. 5. A High Frequency Transformer Winding Model for FRA Applications

   Author : Hanif Tavakoli; Göran Engdahl; Jonas Ekman; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; complex permeability; frequency response analysis; time domain reflectometry; high frequency modeling; transformer diagnosis; Electrical engineering; Elektroteknik;

   Abstract : Frequency response analysis (FRA) is a method which is used to detect mechanical faults in transformers. The FRA response of a transformer is determined by its geometry and material properties, and it can be considered as the transformer’s fingerprint. READ MORE