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 12 of 12 for “"planar arrays"”.
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Analysis and Synthesis of a New Class of Low Side Lobe Planar Arrays
Numerical techniques for designing planar arrays with low side lobe level often require memory intensive optimization algorithms and also initialization in the form of some known values of radiation pattern parameters beforehand - information that may not be available when designing arrays. A few …
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Batch-microfabricated miniaturized planar arrays of Langmuir probes for reentry plasma diagnostics and nanosatellites
… miniaturized satellite. The technology utilizes planar arrays of batch-fabricated micro Langmuir probes that can be surface-mounted on a reentry vehicle or miniaturized satellite as a sensorial skin to perform time-resolved measurements of the electron temperature and number density of the …
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Photonic Metasurfaces for Spatiotemporal and Ultrafast Light Control
The emergence of photonic metasurfaces - planar arrays of nano-antennas - has enabled a new paradigm of light control through wave-front engineering. Space-gradient metasurfaces induce spatially varying phase and/or polarization to propagating light. As a consequence, photons propagating through …
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Characteristic mode theory for closely spaced dipole arrays
Applications of antenna arrays, such as radar, benefit significantly from an array with wide operational bandwidth. In order to create these arrays, designers have traditionally relied on arraying relatively wideband antennas. Recently, planar arrays utilizing narrowband elements have been shown to …
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"""Travelling Without Moving"": A Study on the Reconstruction, Compression, and Rendering of Three-Dimensional Environments for Telepresence"
… which performs surface reconstruction from planar arrays of cameras and generates dense depth maps with multiple values per pixel. Second, we introduce a novel codec for the static depth-image-based representation, which jointly estimates and encodes the unknown depth map from multiple views …
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Optoelectronic fiber webs for imaging applications
… in the development of large scale photodector arrays. Unlike conventional point photodetectors these one-dimensional linear photodectors are capable of sensing light along the entire length of the fiber and 360 radially. Multiple fibers can be arranged in an orthogonal grid to create a …
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Performance analysis of subaperture processing using a large aperture planar towed array
… with high transmission loss. Large aperture planar arrays have the potential to improve detection performance due to their high resolution and high gain, but are suceptible to two main performance degradation mechanisms: limited spatial coherence of signals and nonstationarity of high bearing …
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Synthesis of Ultra-Wideband Array Antennas
… Factors contributing to bandwidth limitation of arrays include array factor, radiation characteristics of the array element, and inter-element mutual coupling. Strictly speaking, distortion-free transmission or reception of ultra-wideband signals can be maintained if the magnitude of the radiated …
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Kelvin-Helmholtz Instability in Magnetized Plasma
… flows. The flows were produced by using quasi-planar arrays of wires inclined such that their connections were closer at the cathode than at the anode. A foil placed on the axis of the system introduced a transverse gradient of the axial velocity of the flow. In both experiments, the time …
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Performance comparison of reflector and AESA-based digital beamforming for small satellite spaceborne SAR
… comparison between a small satellite class planar array and reflector antenna system. Here the focus lies on digital beamforming techniques for the operation in wide-swath, high-resolution stripmap mode. For this the sensor sensitivity and ambiguity suppression performance in range and …
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An Investigation of Tungsten-Based Z-Pinch Planar Wire Array and Benchmarking Experiments
… z-pinch plasmas called bubbling. Specifically, planar wire arrays with relatively large interwire gaps where tungsten is placed in the center of a load configuration composed primarily of a single row of aluminum showed unusual characteristics. These loads are shown to generate an effect in …
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Interactions between polyhedral permanent magnets
… 4 applies the methodology from Chapter 3 to a planar array of frustum magnets, finding no significant benefit over traditional cuboidal planar arrays. Chapter 5 explores magnetic permeability, deriving a methodology to calculate magnetic fields, forces, and torques imparted by linear magnetic …