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 7 of 7 for “"Scanning antenna"”.
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Técnicas de barrido electrónico por frecuencia con agrupaciones de antenas de banda milimétrica y submilimétrica
… Thesis is focused on the study of frequency scanning antenna arrays in the millimeter and submilimeter wave bands. The sweep of the wave front of this type of antennas is achieved changing its operating frequency. The document has been structures in four chapters. In the first chapter a …
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Beam scanning offset Cassegrain reflector antennas by subreflector movement
… the systems required for the mission was a wide scanning, high gain reflector antenna system for use in radiometric remote sensing from geostationary orbit. This work describes research conducted at Virginia Tech into techniques for beam scanning offset Cassegrain reflector antennas by …
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Reconfigurable microstrip antennas with tunable radiation pattern characteristics
Reconfigurable beam antenna systems are capable of changing their radiation characteristics in real time, such as beam direction, beam shape, beamwidth, etc. Such antenna system is desired for various wireless applications because of many reasons among them; it helps to enhance signal strength …
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Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
The conventional antenna systems require the mechanical movement of beam scanning antenna to meet the demands of emerging field of communications. To overcome the flaw of the mechanical movement an electronically tunable reflectarray antenna based on non-homogeneous properties of substrate …
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Composite Right-Left Handed Stripline Structures for Antenna Array Feed Networks
… are proposed as viable key structures in antenna array applications, enabling reduction of the overall feed network sizes as well as allowing integration opportunities and possible reduction of radiating beam pattern distortions.</p> <p>A via-less composite right/left-handed stripline unit …
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HIGH-PERFORMANCE ANTENNA ARRAYS FOR MULTIFUNCTION PHASED ARRAY RADAR (MPAR) APPLICATION
… PPPAR or CPPAR, a high-performance phased array antenna with dual-polarization capability is required. The array antenna is required to possess matched main beams, high input isolation, and low cross-polarization level at broadside and scan angles up to 45◦. The beam mismatch should be within 5% …
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Design and applications of smart antenna systems for wireless networks in the context of the Internet of Things (IOT)
… in the form of thesis by publication. Leaky-Wave Antennas (LWA) consist on a waveguide structure which allows the leakage of part of the power along the structure. For this reason, the radiation of the antenna is produced by the leakage of power. In order to produce coherent radiation, it is …