Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 109 for “"Wide bandwidth"”.
-
Ultra wide-bandwidth micro energy harvester
An ultra wide-bandwidth resonating thin film PZT MEMS energy harvester has been designed, modeled, fabricated and tested. It harvests energy from parasitic ambient vibration at a wide range of amplitude and frequency via piezoelectric effect. At the present time, the designs of most piezoelectric …
-
Wide Bandwidth Control Electronics For Gan-Based Pebbs
… HIL (Hardware in the Loop) is one of the most widely used methods for virtual prototyping. But this technology is limited to signal coupling and it is based on proprietary solutions or dedicated hardware. A novel technology, Power Hardware in the Loop (PHIL), extends the capability and improves …
-
Wide-bandwidth digital controller for multi-phase converters
DC-DC converters with high bandwidth are essential for today's high efficiency and high-speed micro-processing applications. In order to satisfy the requirements of those systems, we propose the implementation of a practical wide bandwidth digital controller for multiphase buck converters. …
-
Wide bandwidth high efficiency power converter for rf amplifiers
… with the fast development of the digital wide bandwidth applications where the non constant envelope signals are applied and the necessary linearity of the power amplifier is very high. Until now, there have been used various techniques in order to increase the linearity: Back-Off, …
-
A Wide-Bandwidth Galvanically Isolated Current Sensor with Frequency Modulation
… must also be able to provide measurements for wide bandwidths and with high sensitivity levels according to their application. In this thesis, a wide-bandwidth and highly sensitive fully integrated shunt-resistor current sensor for off-chip current sensing is presented. The architecture of the …
-
Towards High-Performance Reflectarray Antennas: Phase Sensitivity Reduction for Wide Bandwidth
… and lightweight design. However, their limited bandwidth poses a significant challenge because phase behavior varies across different frequencies. This thesis aims to address this limitation by proposing methods to widen the bandwidth while maintaining antenna performance. The research begins …
-
Dynamic collision reduction protocol for ultra-wide bandwidth multiple access networks
… develop the optimal neighbor detector for ultra-wide bandwidth (UWB) signaling in a dense multipath environment with delay uncertainty. The detector takes advantage of the inherent multipath diversity associated with UWB signaling. We then develop an effective distributed control policy, derived …
-
A New Approach to Wide Bandwidth Energy Harvesting for Piezoelectric Cantilever Based Harvesters
This thesis proposes a control system to widen the bandwidth of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically …
-
Ultra-low and wide bandwidth vibrational energy harvesting using a statically balanced compliant mechanism
… of energy harvesting devices (with narrow bandwidth in the high frequency range) and the accessible vibrational sources (at 1-10 Hz levels) is observed and is still to be filled. In this thesis, a structural solution of vibrational energy harvesters using a statically balanced compliant …
-
Identification of small-signal dq impedances of power electronics converters via single-phase wide-bandwidth injection
… in experimental measurement procedure. Several wide bandwidth injection signals, among which are chirp, multi-tone, pulse and white noise, are compared and theoretically analyzed. Several hardware examples are included in the analysis. The second part of the dissertation will focus on the …
-
A single supply wide bandwidth 4:1 video multiplexer in an 8 GHz dielectrically isolated complementary bipolar process
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
-
Wideband planar array antennas: theory and measurements
The need for a wide bandwidth array is introduced and explained. Basic planar array principles are reviewed as well as previous work performed on wide bandwidth planar array design. An Archimedean spiral is suggested for the array element and a model for the element radiation pattern is presented. …
-
Correlator for a Basis-Space Architecture Ultra-Wideband Receiver
Ultra Wideband (UWB) signals have great potential for high data transmission and precise location. However, their wide bandwidth and low signal to noise levels make UWB receiver design via traditional methods difficult. New receiver architectures have been proposed that rely on the correlation of …
-
Log-Periodic Loop Antennas
… as a new type of antenna, which provides wide bandwidth, broad beamwidth, and high gain. This antenna has smaller transverse dimensions (by a factor of 2/pi) than a log-periodic dipole antenna with comparable radiation characteristics. Several geometries with different parameters are …
-
Ultra-wideband antenna design for microwave imaging applications. Design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment.
… order to accommodate such a short pulse, a very wideband antenna with a minimal internal reflection is required. Printed monopole and planar metal plate antenna is implemented to achieve the necessary operating wide bandwidth. The development of new compact printed planar metal plate ultra wide …
-
Parallel implementation of an algorithm for high resolution range profiling using a stepped frequency radar
… a frequency domain approach for reconstructing wide-bandwidth high resoultion range profiles using stepped-frequency waveforms. In order to minimize the overall processing time, a parallel algorithm was developed and tested in a homogeneous cluster of computers. In Ultra-wideband synthetic …
-
Wideband Compact Antennas for Wireless Communication Applications
… antenna designs is their narrow impedance bandwidth. Furthermore, the market trend of personal wireless devices is moving toward a universal system that can be used anywhere and rapid expansion of the wireless communication industry has created a need for connectivity among various wireless …
-
Ice-Induced Unsteady Flowfield Effects on Airfoil Performance
… Pressure spectra near reattachment exhibited wide bandwidth frequency peaks that indicated a non-periodic phenomenon and corresponded to the regular mode often associated with vortex movement in and aft of the shear layer. Strouhal numbers ranged from 0.53 to 0.73. Although vortex shedding was …
-
Millimeter-wave circuit design of coplanar integrated circuits and superconducting passive components
… transmitters and receivers will increase. The wide bandwidth requirements of multimedia technology restrict the use of conventional radio and cellular bands because of limited channel capacity. Communication systems will be forced to use higher frequency bands to accommodate the expected large …
Page 1 of 6