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.
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Showing 1 to 8 of 8 for “"frequency limitations"”.
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An Investigation of Fundamental Frequency Limitations for HF/VHF Power Conversion
… chiefly be attributed to increases in switching frequency. It is to be expected that the trends towards miniaturization will maintain steady pressure to keep this pace of increasing switching frequencies of power converters. However certain fundamental limits in high frequency power conversion …
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Multi-beam Antenna Arrays for Base Stations in Cellular Communication Systems
… network techniques are approaching physical limitations due to increasing losses and complexity. Quasi-optical techniques for implementing multi-beam antenna such as Luneburg lenses should be an attractive alternative. In this thesis, some of the advantages and limitations of these opposing …
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Time domain device modeling of High Frequency Power MOSFETs
The development of the High Frequency Power MOSFET has brought about a need for accurate models. Now that the frequency range of these MOSFETs is in domains where typically scattering parameter measurements are used, a broad band device model can prove to be extremely useful. This thesis summarizes …
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Investigation into the use of active frequency selective surfaces to extend the absorption bandwidth of a conventional Salisbury screen absorber
… inherent trade-off is due to the fundamental frequency limitations imposed by the constitutive parameters of materials and is more detrimental at microwave frequencies.The aim of the research programme described in this thesis was thus to investigate the use of adaptive complex impedance …
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Investigation of real-time optical scanning holography
… resolution and magnification, methods of carrier frequency hologram generation and experimental verification of the recording technique based on careful measurements of a hologram corresponding to a simple transmissive slit. Furthermore, computer simulations are presented pertaining to the …
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Compilation Techniques for Reconfigurable Analog Devices
… physical behaviors include operating range and frequency limitations, noise, process variation, and quantization error. In this thesis, I present compilation techniques for automatically configuring such devices to execute dynamical systems and present the first compiler that automatically …
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Design and Prototyoing of a Wireless Data Transceiver in the 900MHz ISM Band
… to travel the allotted channel bandwidth in the frequency band of interest. Also, limitations imposed by current radio transceiver technology tend to limit WDL design. The existing sponsor's wired system operates at a 9600 Baud, and presented the opposite problem: the data rate was too low for …
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Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface
… in an open-loop fashion, and with minimal frequency limitations. The wave generation method was developed to generate tailored traveling wave patterns; thus, yielding control over the propagation direction, number of wave-fronts, and regions of the surface containing traveling waves. These …