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 20 of 164 for “"Phased array"”.
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Phased Array 802.11g Antenna
This thesis involves the development of a 2.4GHz phased array antenna for consumer wireless applications. 802.11g specifications include 11 channels from 2.412 GHz to 2.472 GHz. Each channel has a 22MHz minimum bandwidth with a 5 MHz center-to-center interchannel spacing. Design goals for the …
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Digitally controlled microstrip phased array.
Adaptive phased arrays are versatile sensors which adjust themselves automatically and electronically to meet particular constraints. Such a constraint might be to minimise the level of interference or to enhance the desired signals or both simultaneously. This enhanced system performance. These …
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Development of wideband phased array antenna
… – 10.6 GHz). While the second design wideband phased array antenna was realized by adding one element and meander line T-divider, partial ground plane and two slots at ground plane. The antenna was designed and optimized using CST Microwave studio (CSTMWS). The proposed antenna‟s parameters …
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Super-resolution phased array sonar imaging
… to image reconstruction for a multibeam phased array sonar. A generic data model for phased array sonars is first developed and is used to derive conventional signal processing concepts for image reconstruction which are necessary for the implementation of the super-resolution algorithms. …
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Optical feeds for phased array antennas
This thesis investigates optical feed methods for phased array antennas. The technical and practical limitations are analyzed and an optimum design is determined. This optimum optical feed is a two-beam interferometric approach which uses acoustooptic phase control. The theory is derived; a …
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Optimization and Modeling for Optical Phased Array
… As the essential component of LiDAR, the optical phased array plays a fundamental role in the beamforming for the LiDAR.
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Characterization of a Phased Array Feed Model
<p>Creating accurate software based models of phased array feeds (PAFs) is one of many steps to successfully integrating PAFs with current and future radio telescopes, which is a goal of many groups around the globe. This thesis characterizes the latest models of a 19 element hexagonal PAF of …
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Near-Field Focusing Phased Array for Hyperthermia Application
… thesis, we propose a focused applicator made of phased arrays. The advantages of an array applicator are (i) smaller input power and less surface heating for achieving the same field intensity at the tumor, (ii) deeper penetration depth as the propagation loss in the human body is partially …
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DISTRIBUTED PHASED ARRAY ANTENNAS IN WIDE AREA RFID
… the instantaneous power at a tag. Separately, phased array antennas have also been used to increase the read range by increasing the effective field of view of an antenna and overcoming multipath fading through beam steering. This dissertation explores a combination of both approaches to …
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A wearable Transcranial Doppler ultrasound phased array system
… incorporates a custom two-dimensional transducer array and multi-channel transceiver electronics, thereby facilitating acoustic focusing via phased array operation. Algorithmic vessel search and tracking further reduce operator dependencies by expediting vessel localization, systematizing vessel …
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Pulsed ring-down antennas for implementation in a phased array
… implementation into a specific or multi-purpose phased array system. Several of these structures were then constructed, tested, and characterized based upon far field performance. Once the optimal antenna was determined, a five element phased array was constructed. Initially, the phased array is …
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Unconventional Optical Phased Array Design for Next-Generation Wireless Systems
… performance characterization of thinned optical phased arrays (OPAs), aiming to achieve high-quality far-field beamforming and near-field focusing through a multi-objective (MO) optimization framework. The method addresses the challenge of selecting which antenna elements should be retained or …
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Ultra-wideband phased array radar for short-range imaging applications
Ultra-wide band (UWB) technology, as defined by the Federal Communication Commission (FCC) on February 2002, refers to signals or systems that have bandwidth ≥500 MHz or instantaneous fractional bandwidth ≥0.20 [2]. Compared to the conventional narrowband radar that operates with the same centre …
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A phased array sonar for an underwater acoustic communications system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1980.
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Wireless power transmission utilizing a phased array of Tesla coils
… resonant systems and how they can be linked in a phased array for the wireless transmission of electrical power. A detailed derivation of their operational theory is presented with a strong emphasis on the current and voltage waveforms produced. Formulas are presented relating the features of the …
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Chromatic dispersion compensation using a Virtually Imaged Phased Array (VIPA)
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Directing acoustic radiation using a phased array of piezoelectric transmitters
This thesis presents an acoustic phased array system utilizing piezoelectric transducers. The system is capable of operating at arbitrary frequencies into the low megahertz range, with a trade-off between phase accuracy and operational frequency. A maximum of sixteen elements can be introduced to …
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Analysis of phased array antenna radiation patterns including mutual coupling
Methods of expressing the radiation patterns of phased arrays in closed form that include the effects of radiated mutual coupling are investigated. The two basic methods considered are the classical array analysis method and the active element pattern methods. The theoretical derivations of the …
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Feedback Control of Phased Array Electromagnetic Hyperthermia Using MRI Temperature Mapping
… loop spatial steering of the hot spot in a phased array system. (4) Noninvasive techniques are demonstrated that allow focusing of small-wavelength microwave fields into a heterogeneous medium. Temporal and spatial control of microwave heating are demonstrated that represent typical clinical …
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