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 44 for “"Power gain"”.
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Limitations on power gain in feedback amplifiers
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1953.
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A fission-fusion hybrid reactor in steady-state L-mode tokamak configuration with natural uranium
… fission. The fission blanket augments the fusion power such that the fusion core itself need not have a high power gain, thus allowing for fully non-inductive (steady-state) low confinement mode (L-mode) operation at relatively small physical dimensions. A neutron transport Monte Carlo code models …
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On the performance characteristics of multiple pass hydrogen fluoride chemical laser master oscillator/power amplifiers
… (HF) chemical laser master oscillator with power amplifier was measured as a function of input power, the number of passes through the gain media, location of the optical axis of the input beam and oscillator/amplifier flow field match/mismatch. The amplification ratio is an inverse function …
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Distributed beamforming in wireless sensor networks
… nodes changed. Additionally, the maximum average power gain of the main lobe can be increased by increasing the density of the sensor cluster, thereby increasing the transmission range between the sensor clusters and the UAV.
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Steady state thermal hydraulic analysis of hydride fueled BWRs
… constraints, an estimate of the power reduction due to the application of neutronic constraints is also performed. This investigation, focused only on the "New Core" cases, is coupled with an increase of the thickness of the gap separating adjacent bundles from 2 to 5 mm. Under …
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Design of Class-E Radio Frequency Power Amplifier
Power amplifiers (PA) are typically the most power-consuming building blocks of RF transceivers. Therefore, the design of a high-efficiency radio frequency power amplifier is the most obvious solution to overcoming the battery lifetime limitation in the portable communication systems. A power …
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High Performance Electronics Based on Aligned Arrays of Single Walled Carbon Nanotubes
… SWNT arrays. For the first time we have observed power gain from SWNT transistors. This achievement allows us to build all of the key functions of analog electronics, including resonant antennas, fixed RF amplifiers, RF mixers and audio amplifiers. Combining these components we have built the …
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Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
… significant advantages in size, weight, and power consumption (SWAP) and to their capability for photonic integration. However, these devices traditionally suffer from low fiber coupling efficiency and have been limited to relatively low power applications. This thesis explores the potential …
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Design and fabrication of an RF power LDMOSFET on SOI
… (SOI) LDMOSFET technology for RF power amplifier applications. To conduct this study, two generations of SOI RF power devices for portable wireless systems were designed and fabricated. Bulk silicon LDMOSFETs were also made and used as a bench-mark for comparison with the SOI …
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Energy-Efficient Collaborative Communications for Wireless Sensor Networks
… indicates that a large amount of transmitted power is combined; this is referred to as constructive interference. As a result of this constructive interference, collaborative communications produce a substantial power gain, as well as a considerable reduction in bit error rate and a …
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Resource allocation and scheduling for communication satellites with advanced transmission antennas
… area, an optimized method of agile antenna gain patterning and beam scheduling is required to greatly improve the efficiency of transmission and power management. In this thesis, we jointly optimize resource allocation/scheduling, congestion control and antenna gain patterning for …
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Substrate Impurity Incorporation Mitigation for Improved AlGaN/GaN-ON-Si RF Performance
… performance at high frequency in terms of gain, power, and efficiency. This undesirable conductive path is suppressed after developing and optimizing a robust novel interface technology, and the AlN nucleation layer materials are significantly improved. As a result, the RF signal loss on …
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Design and implementation of the pillbox antenna for SASARII
… the configuration for the antenna. The far-field power patterns of the feed and the antenna are simulated in MATLAB and the directivity of the antenna is calculated. The antenna tests which include power gain, 3 dB beamwidth, return loss and cross-polarization measurements are discussed. The test …
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FEL theory in the ION channel wiggler
… for experiments, and thus concluded that high-gain high-frequency coherent radiation generation using the ICL is infeasible.In contrast, this thesis shows that this restriction can be removed by correctly taking into account the dependence of the resonance between oscillations and emitted field …
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Balanced antennas for mobile handset applications. Simulation and Measurement of Balanced Antennas for Mobile Handsets, investigating Specific Absorption Rate when operated near the human body, and a Coplanar Waveguide alternative to the Balanced Feed.
… radiation patterns, radiation efficiency and power gain are presented and several remarkable results are obtained. The measurements confirm the theoretical design concept and show reasonable agreement with computations. The stability performance of the proposed antenna is also evaluated by …
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Analysis and solutions for RFID tag and RFID reader deployment in wireless communications applications. Simulation and measurement of linear and circular polarised RFID tag and reader antennas and analysing the tags radiation efficiency when operated close to the human body.
… of the radiation efficiency and the absorbed power in terms of cumulative distribution functions for different orientation and location of RFID¿s tag antenna on the human body have been demonstrated. Several tag antennas wi th symmetrical and unsymmetrical structure configurations operating in …
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Hydrodynamic Analysis of Arrays of General Bodies
… system response in various configurations. The power gain of these arrays was studied to determine the magnitude of power absorption increase relative to the body in isolation. The results were analyzed to determine arrays and body geometry designs that produce improved system response and …
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A steady-state L-mode tokamak fusion reactor : large scale and minimum scale
… cost (a $50 billion) and exorbitant thermal power (a 35 GWth) of HYPERION, we identify a conservative estimate for the minimum scale of a similar steady-state L-mode reactor of approximately 7.5 meters, half the size of HYPERION and only 20% larger than ITER. This minimum scale reactor would …
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Efficiency enhancement techniques for RF and millimeter wave power amplifiers
Power amplifiers are the circuit blocks in wireless transceivers that require the largest power budget because of their relatively low efficiencies. RF designers cannot depend solely on the development better semiconductor devices in advanced deeply scaled process technologies to obtain improved …
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Comparison of the abilities of historical and current cost information to predict funds flows
… current operating income plus realizable holding gains measured in constant dollars and purchasing power gain (i.e., current real income (CRI)), and historical cost income measured in nominal dollars (HCI) on their ability to predict future funds flows from operations of the business firm. Three …
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