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 13 of 13 for “"Loop Antennas"”.
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Log-Periodic Loop Antennas
The Log-Periodic Loop Antenna with Ground Reflector (LPLA-GR) is investigated as a new type of antenna, which provides wide bandwidth, broad beamwidth, and high gain. This antenna has smaller transverse dimensions (by a factor of 2/pi) than a log-periodic dipole antenna with comparable radiation …
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Design of a Wireless Power Transfer System using Electrically Coupled Loop Antennas
… using these models. The case for using magnetic antennas over electric antennas when surrounded by lossy media (specifically for the case of human body tissues at various frequencies) is made using some theoretical models and simulation results. An Electrically Coupled Loop Antenna (ECLA) is …
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Embedded Antennas In Concrete For Application In Wireless Sensors
… proposed wireless embedded sensor node has two antennas, one for wireless communication to transmit data of sensing and controls at 2.45 GHz, the other for wireless power transfer to charge the built-in battery at 13.56 MHz from outside concrete periodically through near-field transformer-like …
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Ingestible electronics without batteries : power and communication for gastroresident devices
… power through tissue as around 1 GHz. Small loop antennas fabricated to fit onto a circuit board the size of a pill capsule exhibited power transfer efficiencies of around -45 dB when tested ex vivo in pig stomach tissue. Choice of electronic components for rectification, sensing, and …
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Practical localized waves generation
… to determine the excitation currents for the loop antennas inside a circular waveguide. The feasibility and flexibility of the method is demonstrated via numerical examples.
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Impedance effects of metallic ground plane on the CTHA antenna
… development of the communication industry, antennas have become an indispensable part of daily life. However, everyone may have experienced the malfunction of a communication system or radio due to a nearby human body or building or automobile. Then comes the question of how adjacent objects …
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Topology optimization of metamaterials and applications to RF component design
… various metamaterial-inspired miniaturized patch antennas, loop antennas, folded monopole antennas, ultra-compact broadband waveguide filters, and widely tunable resonant structures that are easy to fabricate and at a low cost are presented.
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STUDY OF MULTI- AND BROAD-BAND INTERNAL ANTENNAS FOR MOBILE APPLICATIONS
… and presented in this dissertation. The designed antennas are improved multi-band and broad-band characteristics by the modification of radiating elements and/or the ground plane. The novel modified aperture coupling annular-ring antenna fed by stripline is the hybrid structure of the aperture …
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Antennas using left handed transmission lines
… of conventional wire antenna types, dipoles and loops, based on the left-handed transmission line approach. The left handed antennas have a unique feature that the wavelength of the induced current becomes shorter with decreasing frequency. The left handed transmission line concept can be …
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Modeling and design of near-field antennas with periodic structures
… modelled and adopted in the design of near-field antennas. First, the discontinuous Galerkin time-domain (DGTD) method is applied to model the scattering from periodic structures. The modelling of dispersive media is incorporated into a three-dimensional DGTD scheme, which is capable of studying …
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Closed-loop Tool Path Planning for Non-planar Additive Manufacturing and Sensor-based Inspection on Stationary and Moving Freeform Objects
… the presence of mechanical disturbances. An open-loop non-planar tool path planning algorithm based on point cloud representations of object geometry and a closed-loop non-planar tool path planning algorithm based on position sensing were proposed to address these limitations and enable conformal …
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Novel techniques for improved indoor positioning and localization using HF RFID
… based positioning using a novel concept of multi-loop bridge reader antenna to localise moving objects such as autonomous wheelchairs in indoor environments. Typical HF RFIDs operate at 13.56 MHz and employ passive tags which are excited by the magnetic field radiated by the reader antenna. …
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Design of Miniature Low-Cost Antennas for Compact Low-Data-Rate IoT Terminals
… and energy budgets are more favorable, their antennas are often pushed into the electrically small regime, further complicating impedance matching. The aim of this thesis is to introduce a new design methodology that provides low-cost Electrically Small Antenna (ESA) solutions suitable for …