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 “"RFID antenna"”.
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RFID Antenna Coverage Optimization
… on the problem of determining the location of RFID antennas required to read RFID tags from all items in a facility, such that the number of antennas is minimized. We formulate the problem as a Set Covering optimization problem. We develop a heuristic algorithm for this NP-Complete problem. We …
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UHF RFID Antenna Impedance Matching Techniques
<p>Radio Frequency Identification (RFID) systems use electromagnetic signals to wirelessly identify and track RFID-tagged objects. A reader transmits a carrier wave request signal to an RFID tag, which then transmits a unique identification signal back to the reader. Applications include supply …
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Non-foster matching of an RFID antenna
… novel designs of radio-frequency identification (RFID) tag antennas with better matching characteristics to achieve extended range for passive tags have been investigated in the ultra-high frequency (UHF) band. A variety of cavitybacked/coupled microstrip dipole antennas in 915 MHz range were …
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A Damped Double Dipole UHF RFID Antenna with Application to Wireless Chemiresistive Gas Sensing
… Frequency (UHF) Radio Frequency Identification (RFID) tags provide an inexpensive framework for distributed sensing. Materials such as functionalized carbon nanotubes (CNTs) have been engineered to change in resistance when exposed to a variety of analytes. These materials have been added to RFID …
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Array signal processing for source localization and enhancement
… we consider radio frequency identification (RFID) antenna tags. Using a planar RFID antenna array with beam steering capability and using received signal strength indicator (RSSI) value captured for each beam position, the position of each RFID antenna tag is estimated. The proposed approach …
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Small, dual band, placement insensitive antennas
RFID systems with ``peel-and-stick'' labels are currently limited to tracking items with nearly electromagnetically transparent material properties. This limitation stems from the antenna choice for these labels - a dipole variant. The slot antenna, the effective inverse of the dipole, is shown to …
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The value of accurate automated data collection to manufacturing
… on a combined passive power monitoring and auto RFID data collection system implemented within the CNC turning and CNC milling departments at the Waters Corporation Machining Center in Milford, Massachusetts. A detailed study of the machining center revealed that inaccurate data was being used to …
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Battery-free wireless sensing and beyond
… into a touch-aware surface by directly attaching RFID tags to them. RIO is built using the technique of impedance tracking: when a human finger touches the surface of an RFID tag, the impedance of the antenna changes. This change manifests as a variation in the phase of the RFID backscattered …
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Modelling and analysis of complex electromagnetic problems using FDTD subgridding in hybrid computational methods. Development of hybridised Method of Moments, Finite-Difference Time-Domain method and subgridded Finite-Difference Time-Domain method for precise computation of electromagnetic interaction with arbitrarily complex geometries
… the circumferential and axial directions of the antenna wires. A similar orthogonal basis function is used on the end surface and appropriate attachments with the wire surface are employed to satisfy the requirements of current continuity. The surface current distributions on structures which may …
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Novel techniques for improved indoor positioning and localization using HF RFID
… Frequency Radio Frequency Identification (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 …
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Wearable sensors networks for safety applications in industrial scenarios
… i.e. a network of “things” (such as sensors, tag RFID, actuators etc.) which can communicate and interact with each other within a shared IP addressing range, in order to share data and contribute to the management and development of advanced applications. Specifically, the thesis is focused on …