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 14 of 14 for “"High Isolation"”.
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Optimization of Isolated-Gap Transformers in High-Isolation Dual Active Bridge Converters.
North Carolina State University Theses Electrical and Computer Engineering.
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Reflectarray Antenna based FMCW Radar System Development: High Isolation Radar Antenna Design and Feasibility of Affordable Switched-Beam for the UAV Detection
… cost of current anti-drone radars is extremelyhigh, thus there is a need for cost-effective radars that protect critical infrastructures. The goal of our research is to develop a high gain, low power (potentially battery operated), lightweight, cost-effective, large field of view (FoV), and …
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Self-Interference Cancellation for Simultaneous Transmit and Receive (STAR) Applications
… For a STAR system to be effective, high isolation (in excess of 90 dB) between transmit and receive channels is required to avoid self-interference. A lack of isolation will result in a significant reduction in the receiver sensitivity and dynamic range, reducing its ability to …
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Study of the electromechanic aspects of RF MEM devices with particular emphasis on the dynamic behavior for the case of RF MEM switches and tuneable capacitors
… outstanding advantages like low insertion loss, high isolation and linearity, but they suer from some drawbacks like low switching speed and lack of reliability. In the near future for many applications, like mobile phones and communication systems, reliable switches with higher commutation speed …
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RF MEMS switches : survey and analysis
… great RF characteristics via low losses and high isolation. However, they possess several important shortcomings. At present, RF MEMS switches have low reliability, limited power handling capabilities, and slow switching times. Nonetheless, MEMS switches are poised to provide advantages over …
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Design and realisation of filters on MHMIC and MMIC fabrication processes for duplexers realisation
… filters and duplexers with low losses and high isolation. This thesis presents a miniaturised topology based on a topological miniaturisation technique using computer aided design and analysis. The filters designed in this work are suitable for manufacturing on any planar fabrication …
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Erschütterungsreduktion durch aufgeschäumte Isolierkörper im Boden
The vibration isolation is an important part by the planning or reconstruction of buildings and structures nearby vibration sources such as railways or rotating machines. The conventional isolation methods such as spring elements or elastomer mats are normally very expensive and complicated to …
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DESIGN AND IMPLEMENTATION OF A PHASED ARRAY ANTENNA FOR MULTI-MISSION APPLICATIONS
… measurement, will utilize a new antenna with higher performance. It is the purpose of this research to propose a new dual-polarized phased array antenna for MPAR application. A crossed dipole antenna with sufficient operational frequency bandwidth is designed. A high polarization purity is …
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Radio frequency miniature passive devices: ferrite antennas and inductors
… the unique features of ferrites, such as high electrical resistivity, excellent chemical stability, and mechanical hardness, provide a low eddy current loss at high frequencies and a variety of applications in power and microwave systems. In designing ferrite passive devices, the …
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Silicon-Based PALNA Transmit/Receive Circuits for Integrated Millimeter Wave Phased Arrays
… double throw (SPDT) switches or circulators with high isolation to prevent leakage of transmit energy into the receiver circuits. However, as phased-array designs scale to the millimeter-wave range, with high degrees of integration, the physical size and performance degradations associated with …
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Novel metamaterial frequency discriminating devices for next generation wireless communication systems
… are able to meet the stringent requirements for high-performance systems and subsystems, such as sharp-cutoff frequency response, low passband insertion-loss and high return-Joss, high out-af-band rejection, compact size, low cost and ease of integration. The filters are approximately 70% smaller …
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Investigation into the use of high-efficiency switched-mode class E power amplifiers for high-dynamic range pulse-mode applications
… to meet system sensitivity requirements. In high-dynamic range systems, the power amplifier pulse must turn off at a rate compatible with the system noise floor at the receive time. Some high-dynamic range systems are sensitive to signals greater than 120 dB below the transmit power level, …
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Application of hazard analysis critical control point (HACCP) concept to study cattle slaughterhouse hygiene and Carcass contamination in Zambia
… all sampling points with skin samples recording high isolation frequencies.The results of this study indicate that neither aerobic plate count nor total coliform counts alone is sufficient to analyse carcass contamination levels at various operational points but the two, however, are …
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Application of hazard analysis critical control point (HACCP) concept to study cattle slaughterhouse hygiene and Carcass contamination in Zambia
… all sampling points with skin samples recording high isolation frequencies.The results of this study indicate that neither aerobic plate count nor total coliform counts alone is sufficient to analyse carcass contamination levels at various operational points but the two, however, are …