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 19 of 19 for “"Loop antenna."”.
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An electrically small multi-port loop antenna for direction of arrival estimation
… from which an incoming signal originates. These antennas are often loops or dipoles oriented in a manner such as to obtain as much information about the incoming signal as possible. For direction finding at frequencies with larger wavelengths, the size of the array can become quite large. In …
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Inertially stabilized platforms for SATCOM on-the-move applications : a hybrid open/closed-loop antenna pointing strategy
… high data-rate communications require inertial antenna pointing to within fractions of a degree. The base motion of the antenna platform complicates the pointing problem and must be accounted for in mobile SATCOM applications. Antenna Positioner Systems (APSs) provide Inertially Stabilized …
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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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Antennas using left handed transmission lines
… the analysis and design 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 …
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A sudden ionospheric disturbances monitor
… design phase of the Sudden Ionospheric Monitor a loop antenna was considered as a means to transfer energy from free space into a guided wave into the receiver. A VLF receiver was also considered, which would incorporate all the signal processing and finally a data-logging device after the …
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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 And Analysis Of Adaptive And Reconfigurable Antennas For Wireless Communication
… a tremendous increase in the number of antennas onboard, on the ground, and in orbital space. This places a burden due to the confined volume and limited weight requirements especially in space applications. The reconfigurable antenna is a promising and exciting new type of antenna, …
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Electrical Design and Testing of an Uplink Antenna for Nanosatellite Applications
… crosslink. A linearly polarized resonant loop antenna mounted above the bottom surface of the spacecraft was selected for a possible satellite uplink receive antenna. The resonant loop was chosen to satisfy the physical requirements of the spacecraft whild still achieving efficient …
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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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Tunable electrically small antenna for next generation ionospheric heating
… metamaterial inspired electrically small antenna with the capability of frequency reconfiguration is evaluated for potential future use in Transportable Ionospheric Heating. Consisting of a Small Loop Antenna (SLA) inductively coupled to a Capacitively Loaded Loop (CLL) this design …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
Light-weight phased array antennas for aerospace and mobile applications require utilizing the same antenna aperture to provide multiple functions with dissimilar radiation pattern specifications (e.g., multiband operation for communications and tracking). Multi-functional antennas provide …
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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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Real time water pipes leak detection using electromagnetic waves for the water industry
… as a circular waveguide cavity, and also for antenna simulation. The monopole and loop antenna were designed to determine the best antenna for this project. The printed circuit board (PCB) design package Eagle was used to provide the surface mount layout for the sensor, and the PCB board was …
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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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Time-Variant Components to Improve Bandwidth and Noise Performance of Antennas
… Thus, the design of low-noise devices (such as antennas, amplifiers, and filters) is essential to increase the communication range. Also, it is well known that the noise performance of a receiving radio is primarily determined by the frontend including the antenna, filter, and a low-noise …
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Implanted Antennas and Intra-Body Propagation Channel for Wireless Body Area Network
… as frequency band selection, channel modeling, antenna design, physical layer (PHY) protocol design, medium access control (MAC) protocol design and power source. This research focuses on the design of implanted antennas, channel modeling between implanted devices and Wireless Power Transfer …
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Low Power Adaptive Wireless Circuits for the Internet of Things and In-body implants
… adaptation ranging from reprogrammable antennas and harvesting circuits to adaptive wireless protocols and analog front-ends. I demonstrate the value of my approach by designing, fabricating, and evaluating three end-to-end wireless systems each fully integrated in a 65nm CMOS IC for IoT …
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Capacity-approaching data transmission in MIMO broadcast channels
This dissertation focuses on downlink multi-antenna transmission with packet scheduling in a wireless packet data network. The topic is viewed as a critical system design problem for future high-speed packet networks requiring extremely high spectral efficiency. Our aim is to illustrate the …
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RF Harvesting System for Remotely Powered Wireless Sensor Nodes
… drive rectifier and an inductively coupled loop (ICL) antenna. The proposed methodology acts on both rectifier and antenna, and aims at optimizing system performance in terms of efficiency and input sensitivity for a given load specification. Moreover, a rectifier solution is also proposed …