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 “"lumped elements"”.
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Miniaturization of on-chip passive electronic devices by silicon nitride self-rolled-up membrane microtube nanotechnology
Miniaturization of the commonly used on-chip lumped elements is highly desirable to enhance the density, performance and functionality of integrated circuits (ICs) working from DC to millimeter wave frequency band. Numerous improvement methods have been demonstrated but all fail to fundamentally …
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Static Metasurfaces Reflectors with Independent & Complete Control of Magnitude & Phase
… reflectance. Designed in the Ka band with no lumped elements required. The UC design is examined and demonstrated in several different surfaces, such as a multi-beam steering surface, capable of directing two different beams of different relative magnitudes and also having different …
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Transient analysis of lossy multiconductor transmission lines in nonlinear circuits
… circuits. Because these models contain only lumped elements, they can be easily implemented in a general circuit analysis program for simulating the transient responses of nonlinear circuits. The analysis procedure developed makes exclusive use of infinite-line impulse responses in the …
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Design, fabrication, and characterization of a wideband microwave balun
… paths are modeled as distributed and lumped elements, resulting in an equivalent network model for the balun structure. The obtained model successfully simulates the balun's performance.
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Two dimensional control of metamaterial parameters for radiation directivity
… metamaterial wedge is then adjusted by adding lumped elements of capacitance throughout the structure. A beam through this adjustable material is deflected -76° to +580 by adding 0pF to 6pF additional capacitance. The deflection is not monotonic, but most pronounced between 0.lpF and 0.8pF. The …
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Design of Class-E Radio Frequency Power Amplifier
… are implemented in section 5.3. One of them is a lumped elements based circuit and the other is a transmission lines based circuit. Both circuits show good performance (60% PAD) over a wide bandwidth (1.0 GHz). In section 5.4, lumped elements and transmission lines based X-band class-E amplifiers …
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Six-port wireless receiver architectures
… modelling strategy for each of the lumped elements required to construct a six-port digital receiver using RFCMOS technology has been studied. Novel models and design rules for CMOS capacitor and inductor design have been given. The various methodologies for the design of a RF CMOS …
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The limits of Brune's impedance
… sufficient condition for network synthesis using lumped elements. Brune's impedance, described using a ratio of polynomials, represents a fundamentally limited subset of impedance functions. Quite notably, all lumped-element networks do not support wave propagation. Two classes of impedances …
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Study of an active RC line in the microwave region
… is a monolithic, integrated circuit which uses “lumped” elements to approximate a distributed-parameter active RC line. The active region of this device are IMPATT diodes which are capable of generating negative conductance effects (through transit-time delays of majority carriers) at microwave …
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A computational tool for microstrip planar filter design
… design procedures through this tool start from lumped elements filter up to Microstrip filter. The user just needs to insert the required filter specifications and the design’s material description then all the required results will be displayed including lumped element filter along with …
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Electromagnetic Modeling of the Power Distribution Network in Packaged Integrated Circuits Using a Hybrid Extended Segmentation Method
… The technique includes the incorporation of lumped elements. The network multiport is formed in a hierarchical systematic manner. Furthermore, a special methodology for the incorporation of the various loss mechanisms present in real structures is introduced. Finally, a rational function …
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Modelling and Simulation of the Nonlinear Dynamics of Arrays of Coupled Filaments for Robot Walkers
… filaments that are coupled through visco-elastic lumped elements at the base. These filaments emulate hair-like structures idealized as inverted pendulums, capturing certain characteristics of cilia-like structures that are relevant for the locomotion. Mechanical coupling is achieved through …
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Envelope tracking integral equation based hybrid electromagnetic circuit simulators
… of fields with distributed structures and lumped elements by coupling and simultaneously solving the electric field integral equation and Kirchhoff’s equations, respectively. The coupled nonlinear system of equations is iteratively solved by a time marching scheme that represents the …
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Characterization of Josephson Devices for Use in Quantum Computation
… simple Hamiltonian, derived assuming just a few lumped elements, describes the observed behavior of a macroscopic Josephson device, including coherent dynamics such as Rabi oscillations. I did this by comparing results to the expected behavior of ideal two-level systems and with more detailed …
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Optimization and design of radio frequency piezoelectric MEMS resonators
… with a mode conversion AlN S0 resonator and lumped elements for widening the bandwidths of resonator-based filters. Chapter 7 proposes lithium niobate (LiNbO3) multilayered resonators with large electromechanical coupling, structure robustness, and good temperature stability. The analysis of …
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Amplifier Architectures for Wireless Communication Systems
… BJT. The proposed design uses only distributed elements to realize the input and output matching networks. Additionally, a passive DC bias network is used instead of an active DC bias network to avoid possible complications due to the lumped elements parasitic effects. The matching networks are …
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Modeling and simulation for signal and power integrity of electronic packages
… model of a plane-pair. Thus, the values of the lumped elements can be simply calculated from the physical parameters, such as material properties and mesh geometries of each unit-cell. Consequently, the modeling of MTEM is flexible and easy to modify for further extensions, such as the …
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Mixed-domain simulation and hybrid wafer-level packaging of RF-MEMS devices for wireless applications
… per mezzo di modelli a parametri concentrati (lumped elements) estratti da misure sperimentali e simulazioni agli Elementi Finiti (FEM) della parte di package. Infine, la possibilità offerta dall’ambiente Cadence c relativamente alla simulazione di dipositivi RF-MEMS interfacciati alla parte …
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Efficient Finite Element Electromagnetic Analysis for High-Frequency/High-Speed Circuits And Multiconductor Transmission Lines
… field solver with high-order vector elements for high-frequency and high-speed circuit simulations. The solver supports wave port and lumped port excitations as well as the incorporation of lumped networks and circuit models in a distributed finite element model. An adaptive …