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 38 for “"S-parameter"”.
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S-parameter modeling of two-port devices using a single, memoryless nonlinearity
… a nonlinear two-port device by a scattering parameter (S-parameter) model containing a single nonlinearity. Furthermore, it is proposed that the nonlinearity be modeled as a memoryless nonlinear function. A bipolar junction transistor (BJT) operating in the active region is suggested as one …
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Observing limitations of the discrete Hilbert transform with S-parameter measurements of microstrips and striplines
S-parameter measurements of microstrips and striplines were done. The physical properties of the devices under test, consisting of nine single coplanar traces and nine pairs of coupled coplanar traces, are provided. The lab setup and equipment used to make such measurements are explained along with …
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An experimental study of the wall characteristics of a local fluid constriction plasma generator
… the energy equation results in a dimensionless S parameter which determines the thermal development length. The S parameter is the product of mass flow rate, electrical conductivity, enthalpy, and duct diameter divided by the arc current squared. The thermal development length is the product of …
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Optimization of Near Field Coupling for Efficient Power Transfer Utilizing Multiple Coupling Structures
… and field results were shown during resonance. S-parameter results show simulated transfer efficiencies of 70% (-1.5dB) for a phased array structure and 62.3% (-2.4dB) for a single feed structure. Single feed prototyping S-parameter results show coupling efficiencies of 25% (-5.9dB). All coupling …
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On the Analysis, Design, and Modeling of Electrostatic Discharge Protection Devices for Analog and Radio -Frequency Integrated Circuits
… off-state impedance of the device using s-parameter measurements, for inclusion in RF circuit simulations. Experimental results are provided for silicon and SiGe npn transistors.
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An Improved dipole-moment model based on near-field scanning for characterizing near-field coupling and far-field radiation from an IC
… layers. In the fourth paper a unified s-parameter (multimode s-parameter) representation for a multiport passive structure is proposed. Both mixed-mode and single-ended s-parameters arc included in the unified representation, which makes it more convenient to characterize …
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Positron annihilation spectroscopy to understand defect formation and evolution in neutron-irradiated Fe-Cr model alloys
… stages of α’ precipitation is possible, lower S-parameters were determined. The S-parameter is indicative of the number and size of vacancy-type defects in the samples, so a lower S-parameter suggests that chromium segregation reduces the vacancy clustering in these samples. Specific trends for …
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Design and simulation of a 20 Gbps communication channel
… was used to simulate the channel and display S-parameter models and eye diagrams to demonstrate the impact of various designs. The effects of the material properties, impedance of the traces, and vias were simulated and the results combined to determine what physical layer improvements must be …
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Novel Methodologies and Measurement Software for Transistor Amplifier Synthesis in Planar Coupled -Transmission Lines
… We next describe a frequency domain normal mode parameter extraction method for a symmetric, uniform, MTL section. This is applied to coupled microstrip and coplanar lines for distributed circuit parameter extraction from S-parameter simulation. Measurement techniques for characterization of MTL …
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Enhanced modeling methodology for system-level electrostatic discharge simulation
… on the circuit board’s power delivery network. S-parameter measurements enable the development of a model for an IEC 61000-4-2 ESD source that comprehends the coupling among the ground straps and the ground plane. The transient-voltage-suppressor device is modeled using a behavioral snapback model …
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Modeling Electromagnetic Wave Propagation in Electrically Large Structures
… of the media.</p> <p>Second, a hybrid FD/FDTD/S-parameter analysis is developed to model a large (10^4 section) optical Bragg resonator: a simple FD method computes propagation constants and field profiles, FDTD analysis provides reflection and transmission coefficients for the single section, …
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Statistical Modeling of the Effects of Process Variations on Silicon Photonics
… in the presence of different line edge roughness parameters. In the case of coupled resonator optical waveguides, to predict the behavior in the presence of different line edge roughness parameters, we develop an S-parameter based model that can be used directly in circuit simulation. Also, we …
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Design and Characterization of Liquid Metal Flip Chip Interconnections for Heterogeneous Microwave Assemblies
… in a liquid metal, flip chip configuration. S-parameter measurements of prototype MMIC assemblies with liquid metal, flip chip interconnections showed an average transition loss of 0.7dB over the MMIC's frequency of operation (4.9 - 8.5 GHz). Passive assemblies were also fabricated to …
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A compact transport and charge model for GaN-based high electron mobility transistors for RF applications
… charge expressions in the model require very few parameters. The parameters have straightforward physical meanings and can be extracted through independent measurements. The model is implemented in Verilog-A and is compatible with state of the art circuit simulators. The new model is calibrated …
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Suspended stripline filters for ultrawide bandwidth and high RF power
… and they were experimentally measured. The S-parameter and group delay results were in good agreement with the simulation. Peak power was analysed, showing that the suspended stripline filter can handle high RF power levels without voltage breakdown in Spark3D.
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An Experimental Study of Longitudinally Embedded Vortices in a Turbulent Boundary Layer via the Non-Invasive Comprehensive LDV Technique
… for comparison with previous work. The 1/S parameter and vq^2 parameter were found to be most appropriate to correlate the Reynolds stresses and triple products, respectively. The higher inflow edge velocity and greater momentum thickness, creating a lower vortex generator to boundary layer …
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Simulation of Rectangular, Single-Layer, Coax-Fed Patch Antennas Using Agilent High Frequency Structure Simulator (HFSS)
… coax-fed patch antenna in HFSS. Plots of S-parameter values are calculated and are compared with WIPL-D, which is another simulation software program, and with measurements performed at the George Washington University. Various important parameters of the HFSS simulation are varied and their …
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Large-signal characterization and modeling of nonlinear devices using scattering parameters
… efforts may not be cost effective. Scattering parameters, widely used for small-signal passive and active device characterization, have received only cursory consideration for large-signal nonlinear device characterization due to technical and theoretical issues. We review the theory of …
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A Tri-Ridged Flared Horn for Radio Astronomy Applications
… bandwidth. A goal function based on an S-parameter analysis for the reflection coefficient optimisation is also found. The TRWG OMT features a reference port that can be used for gain calibrations. The best result for this TRWG OMT is a maximum of −10 dB reflection coefficient across a 1.2 …
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VHF bipolar transistor power amplifiers: measurement, modeling, and design
… measurement approach is a hybrid of the common S-parameter measurement technique and the "load-pull" procedure. Practical considerations such as amplifier stability, bias network design, and matching network topology are also included in the report.
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