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 50 for “"matching network"”.
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Tunable Impedance Matching Network Fundamental Limits and Pracitical Considerations
… impedance mismatch. Recently, tunable impedance matching networks have begun to be implemented to address this problem. ^ This dissertation presents the first in-depth study on the frequency tuning range of tunable impedance matching networks. Both the fundamental limitations of ideal networks as …
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Deposition of tantalum thin films by RF sputtering with substrate bias
… techniques. A magnetron sputtering system with a matching network between the source and the RF generator has been used to carry out the experimentation. The matching network was adopted from an industrial system and equipped with a manual controller designed and built during the course of this …
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Controllable Transformation Matching Networks for Efficient RF Impedance Matching
… plasma processing typically relies upon tunable matching networks to transform the variable plasma load impedance to a fixed impedance suitable for most rf power amplifiers. Plasma applications require fast tuning speed with precise control from the matching networks while operating at a high …
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Far field RF power extraction circuits and systems
… Next I devise circuit, antenna and impedance matching network design strategies to efficiently approach these theoretical bounds. Finally, I use these strategies to create an experimental power extraction system that collects RF power at low electromagnetic field strengths. This system enables …
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Frequency synthesis using MEMS piezoelectric resonators
… of approximately 200 MHz. The 800 MHz to 1 GHz matching network is presented in detail along with predicted performance capabilities across this frequency range. The second design implements matching networks with variable capacitors and a variable load impedance. CAD performance simulations …
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The Stub Loaded Helix: A Reduced Size Helical Antenna
… the development of an appropriate impedance matching network for the SLH, which is also detailed.
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Negative-group-delay and Non-foster Electromagnetic Structures
… of non-Foster reactive elements using NGD networks are proposed. To this end, NGD and non-Foster structures are investigated separately in Chapters 1 and 2 and related corresponding applications are explored. Then, a two-way link between these two phenomena is proposed, analytically …
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A Compact RF/Photonic Antenna using a Quantum Dot Mode Locked Laser as a Source
… of the integrated module. An impedance matching network is designed to match the QDMLL to a bowtie slot antenna. The RF/Photonic integrated prototype is tested and analyzed over a wide frequency range. Finally a QDMLL-integrated-phased antenna array is designed to achieve beam steering. …
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Design of an ICRF fast matching system on Alcator C-Mod
… In this thesis, novel solutions for real-time matching and reduction of these variations are investigated and studied for implementation on the Alcator C-Mod tokamak. Load tolerant prematching networks are reviewed and a prototype configuration for E-antenna is proposed. By maintaining low …
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High frequency AC power converter for low voltage circuits
… and high current. Two approaches to polyphase matching networks in the transformation stage are compared: a 3-phase system with separate single-phase matching networks and individual full bridge rectifiers, and a 3-phase delta-to-wye matching network and a 3-phase rectifier bridge. In addition, …
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Circuits and passive components for radio-frequency power conversion
… the thesis investigates a new class of matching networks that overcomes a major limitation of rf converter circuits - their high sensitivity to loading condition. These networks, which are termed resistance compression networks, serve to substantially decrease the variation in effective …
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An accurate junction circulator design procedure
… measured puck impedance values for easy matching network synthesis.
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Design and characterization of a UHF diplexer/antenna combination
… Moreover, an implementation of a combinational matching network construction between antenna and diplexer can also be discussed.
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A high frequency variable load inverter architecture
… variable load impedances, such as the tunable matching network, have typically resulted in systems that are often bulky, expensive, and slow. The physical prototype developed for this project operates at 13.56MHz and can supply a maximum output power of 1kW into a 21:8 + 0:3j load at an eciency …
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Broadband Terahertz Signal Generation and Radiation Based on Direct Digital-to-Impulse Radiating Arrays in Silicon
… consisting of an on-chip antenna and a broadband matching network. This novel method converts a digital trigger edge to a radiated THz pulse with a high timing accuracy. A broadband matching network and an ON/OFF impulse-shaping technique are designed to maximize the amplitude of the pulse and …
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Variation resolutions for CMOS sensing networks
… with other techniques including high-Q impedance matching for input voltage boosting and hierarchical tandem stages for further improvement on operating conditions. With a Q=10 matching network, -27 dBm sensitivity and 22% efficiency can be achieved for about 0.5 V DC output to a 500 kΩ load at …
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… biasing of the Class-B PA and a low-loss output matching network using high-Q bondwire inductances in the package. Assisted by an integrated feedback path, a two-dimensional, digital look-up table (2-D LUT) adapted by complex gradient-descent algorithms compensates the I/Q mismatch and memoryless …
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VHF bipolar transistor power amplifiers: measurement, modeling, and design
… considerations such as amplifier stability, bias network design, and matching network topology are also included in the report.
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Control and in-situ measurement of adaptive and reconfigurable RF systems.
… for controlling a tunable power amplifier matching network that can optimize fundamental, second, and third harmonic terminations for improvements in output power or efficiency is shown. Additionally, extension to nine optimization parameters and implementation of impedance tuning into a …
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Techniques for efficient radio frequency power conversion
… (PA) or inverter along with a tunable impedance matching network (TMN). Electronically-controlled TMNs offer substantial benefits when it comes to the implementability of such highly reconfigurable and adaptive RF systems as they allow for proper impedance termination of the PA or inverter over …
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