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 11 of 11 for “"single-feed"”.
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Modeling and experimental validation of a single-feed semi-batch precipitation process
… mixing conditions. In the present work, the single-feed semi-batch precipitation process of barium sulfate in a stirred tank was experimentally studied and numerically predicted using a micromixing model based on CFD. A commercial CFD package (FLUENT) was used to simulate the flow field and …
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Optimization of Near Field Coupling for Efficient Power Transfer Utilizing Multiple Coupling Structures
… phased array structure and 62.3% (-2.4dB) for a single feed structure. Single feed prototyping S-parameter results show coupling efficiencies of 25% (-5.9dB). All coupling measurements are at a distance 4r with reference to the largest transmitting coupler.
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Selected Reflector Antenna Studies
… of this work are a comprehensive analysis of feed-array compensation of reflector antenna surface distortion and a description of a newly developed technique to produce a shaped-contour radiation pattern using a single shaped reflector and a single feed element.
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Critical Analysis Of Transmitarray Antenna Design
… considering the oblique incidence angles and the feed polarization conditions is performed, aiming to study their impacts on the antenna gain and the radiation patterns. * in order to reduce the transmitarray design complexity and cost, three different methods to reduce the number of transmitarray …
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A frequency reconfigurable circularly polarized microstrip patch antenna using liquid metal microswitches
… actuated switches are designed into a compact single-feed patch antenna configurable between two communication frequency bands and a GPS band with different circular polarizations. The antenna topology is based on a corner truncated square patch with switched sets of extensions to achieve …
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Analysis and design of linear-to-circular polarising reflector antennas exploiting periodic metallodielectric arrays
… number of reflectors in multi-beam antennas in single-feed-per beam architectures while providing circular polarisation for the downlink/uplink. The first part of the thesis is concerned with the analysis of single reflector antennas, focusing on their depolarisation properties. MATLAB® codes are …
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Investigation of a Novel Dual Band Microstrip/Waveguide Hybrid Antenna Element
… if there is dual band antenna operating from a single aperture. Some applications require covering both transmitting and receiving frequency bands which are spaced apart. Providing multiple antennas to handle multiple frequencies and polarizations becomes especially difficult if the available …
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Integrated Filter Antennas for Wireless Transceivers
… combine them together in the form of a single component has a number of advantages. The overall size of the wireless transceivers with such a single component will reduce. There will be a decrease in the manufacturing cost as well. In addition, the single component will use a single feed …
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Advanced Design Methodologies and Novel Applications of Reflectarray Antennas
… multi-beam performance can be achieved using a single-feed. Local and global phase-only optimization techniques have been implemented. Two Ka-band quad-beam prototypes with symmetric and asymmetric beams have been fabricated and tested. • Different approaches for beam-scanning with reflectarray …
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Reconfigurable Wideband Circularly Polarized Microstrip Patch Antenna for Wireless Applications
… to achieve circularly polarized (CP) probe feed single-layer microstrip patch antenna with wideband characteristics is proposed. The antenna is a modified form of the popular E-shaped patch, used to broaden the impedance bandwidth of a basic rectangular patch antenna. This is established by …
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Low Profile, Printed Circuit, Dual-Band, Dual-Polarized Antenna Elements and Arrays
… allow circular polarized operation with only a single feed point. The sense of the circular polarization is determined by the location of the feed point with respect to the perturbations. Both senses of circular polarization are excited by the introduction of orthogonal feeds for each of the two …