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 75 for “"Q-factor"”.
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The design of high Q-factor silicon integrated inductors for up to 4 GHz applications
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Acoustic resonators with integrated microfluidic channels for ultra-high Q-factor: a new paradigm for in-liquid gravimetric detection
… (POC) applications. However, the quality factor (Q-factor) of acoustic biosensors is often low, limiting their sensitivity and accuracy in terms of in-liquid gravimetric detection for biosensing applications. In this dissertation, we present a novel approach that eliminates nearly all …
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DESIGN, SIMULATION AND OPTIMIZATION OF HIGH Q RF SPIRAL INDUCTORS ON SILICON CHIPS
… works done to find many methods to improve the Q factor, the optimization of the spiral inductors is a never end job, and there is a continually great incentive to design, optimize, and model spiral inductors fabricated on Si substrates. Our project firstly researches on the design and …
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Optical micro-resonators in chalcogenide glass
… quality of a resonator is quantified in its Q-factor. This can be measured by coupling light into a microsphere and observing the spectral intensity of scattered light. Using this method GLS microspheres were shown experimentally to have a Q-factor of up to 1.2x10<sup>5</sup> at a wavelength of …
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Microwave ring resonator based on thermoplastic substrate for chicken breast meat quality identification application
… 3dB bandwidth (0.018 GHz and 0.02 GHz) and Q-factor (122.22 and 110). From the results of the simulation and the measurement of the MRR overlaid with the CBM, the Q-factor showed a good agreement as well, where the aged CBM showed a higher Q-factor (37.93 and 31.42) compared with the fresh CBM …
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Development of optomechanofluidic resonators
… (OMFRs) supporting both high-optical Q factor whispering-gallery modes and high-mechanical Q factor optomechanical modes have recently emerged as a novel sensor configuration able to respond to mass density, mechanical compressibility, and viscoelasticity of label-free cells and …
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Low loss film bulk acoustic resonator in liquid environments
… shears acoustic waves. There is a significant Q factor loss in liquid medium due to acoustic energy loss. This drastically affects the minimum detectable mass of the sensor. This research describes the design and fabrication of an FBAR that has low loss in liquid environments. The new design …
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Dielectric characterization of materials and lossy filter design using reflected group delay
… can be identified by their high quality factor (Q-factor). Higher insertion loss (lower Q-factor) in the filter response is acceptable based on the communication system using that filter and its position in that system. Filter design must deal with the electrical and physical …
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All-optical 2r regenerator based on self-phase modulation
… regeneration stage. For NRZ-OOK, the maximum Q-factor before and after the regeneration stage are 3.751 and 5.859, respectively. The minimum bit error rate (BER) after the degradation stage is 10-5 and is further improved to 10-9 after the regeneration stage. For RZ-OOK, the maximum Q-factor …
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Gallium arsenide field effect transistors microstrip integrated circuit dielectric resonator oscillators
… and their performance compared to other high Q factor (ie narrowband) microwave oscillators. The thesis has three major objectives. The first is to collate the information required to build microwave DROs. The second is to present the practical results obtained from Dielectric Resonator …
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Computational modeling of intrinsic dissipation in nano-structure
… also, investigate the role of tension on the Q factor, a measure of the inverse of dissipation rate. From these studies, we conclude that Akhiezer dynamics plays a dominant role in nano-resonators. We, then, develop a quasi-harmonic based multi-scale method to model Akhiezer damping. A stress …
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Radiation Pressure induced Nonlinearity in Micro-droplet
… resonators can exhibit very high quality (Q) factors, since the resonator surface can maintain atomic level smoothness. The combination of high Q factors and small resonator volumes has led to a wide range of applications in sensing, optomechanics, nonlinear optics, and quantum optics. In this …
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Micromachined Components for RF Systems
… performance. An inductor with a peak Q-factor of 21 and an inductance of 2.6nH at 4.5GHz has been fabricated on a silicon substrate. In addition, successful integration with a CMOS power amplifier has been demonstrated. A high-aspect-ratio inductor fabricated using epoxy core conductors …
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THEORY, FABRICATION, AND EXPERIMENTATION OF PHONONIC CRYSTALS IN MEMS AT MICRO/NANO SCALE: ENGINEERING OF THERMAL AND RF PHONONS TO APPLICATIONS IN THERMOELECTRICS AND MICRORESONATORS
… nano scales to engineer acoustic filters, high Q-factor resonators, and thermoelectric properties of materials. Studying PnCs at the micro/nano scale requires specific characterization techniques, which rely on Micro Electro Mechanical Structures (MEMS). This work focuses on the study, and …
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A subsampling delta-sigma modulator for global navigation satellite systems
… and the reduction of the effective Quality (Q-factor) of the loop filter prevent conventional CT-ΔΣ modulators to be utilized in subsampling receivers. This thesis proposes a novel CT-ΔΣ modulator at both the system and the circuit level that is capable of compensating for the effects of …
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Remote-Controlled Self-Assembly of Three-Dimensional Micro Structures for Ultra-Sensitive Sensors and Three-Dimensional Metamaterials
… and isotropic behaviors. However, the quality factor (Q-factor) of conventional MMs is low (typically under 10), results in low sensitivity and selectivity. To increase Q-factor of the MMs, we developed novel nanopillar-based MMs driven by displacement current. The nanopillar-based MMs contain …
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Development and Scaling up of Oxide Buffer Architectures on Flexible Substrates for Efficient and Application-Derived Growth of REBCO Thin Films
… of their low surface resistivity, high-quality factor (Q-factor), and low signal-to-noise ratio (SNR), which are essential for ensuring high-quality signal transmission. This study aims to improve the Jc and processing efficiency of REBCO to support the fabrication of 5-μm-thick film REBCO tapes …
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One-dimensional photonic crystal / photonic wire cavities based on silicon-on-insulator (SOI)
… application in WDM systems. The high quality factor, Q, and confinement of light in a small volume, V, are important for optical signal processing and filtering purposes, implying large Purcell factor values. In this thesis, one-dimensional photonic crystal/photonic wire micro-cavities have …
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Next generation instrumentation for photonic crystal biosensors: a passage to early detection of cancer
… is a combined effect of the PC quality-factor (Q-factor) and the instrument angle of divergence. From a practical standpoint, a higher Q-factor gives a higher fluorescence enhancement but at the cost of higher variability in the fluorescence enhancement. To combat this we introduce a new …
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Modal analysis of radiation and energy storage mechanisms on conducting scatterers
… on the determination of an embedded antenna's Q factor is studied using radiation modes, giving a new perspective on the convergence behavior of this parameter with respect to ground plane size. Leveraging the invariance of radiation modes on small objects, an example procedure for the design of …
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