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 5 of 5 for “"log spiral"”.
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A deployable bottom fed conical log-spiral antenna for CubeSat applications
… a CubeSat, with the major focus on the conical log-spiral antenna (CLSA) due to its frequency independent characteristics. The antenna design will then go beyond the published works of the CLSA to introduce a new feeding concept, a bottom fed CLSA. Necessity for this feeding rises out of limited …
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RF hardware design of a stepped frequency continuous wave ground penetrating radar
… controlled by a PC was assembled. Cavity-backed log spiral antennas were designed and built by the University of Stellenbosch for the specific use of ground penetrating radar. Measurements with the first generation system proved the concept of SFCW GPR and thus a dedicated second generation …
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Dynamic Testing of a Full-Scale Pile Cap with Dense Silty Sand Backfill
… bottom of the pile cap. Rankine, Coulomb, and log-spiral earth pressure theories underestimated the passive earth pressure from the backfill by at least 30%. The natural frequency of the pile cap increased with increasing with static displacement level while placement of the backfill further …
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Investigation of the Resistance of Pile Caps to Lateral Loading
Bridges and buildings are often supported on deep foundations. These foundations consist of groups of piles coupled together by concrete pile caps. These pile caps, which are often massive and deeply buried, would be expected to provide significant resistance to lateral loads. However, practical …
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Design and Implementation of System Components for Radio Frequency Based Asset Tracking Devices to Enhance Location Based Services. Study of angle of arrival techniques, effects of mutual coupling, design of an angle of arrival algorithm, design of a novel miniature reconfigurable antenna optimised for wireless communication systems
… The antenna geometry is uniplanar printed logspiral with striplines feeding network and biased components to improve the impedance bandwidth. The antenna provides the benefit of small size, and re-configurability and is very well suited for the asset tracking applications.