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 42 for “"coplanar waveguide"”.
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High-Q superconducting coplanar waveguide resonators for integration into molecule ion traps
… We fabricated the resonators as two dimensional coplanar waveguides in niobium on R-plane sapphire using optical lithography. Resist was patterned on the niobium using optical lithography, developed, then reactive-ion etched to transfer the pattern into the niobium. The resonators were cooled and …
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Design and Analysis of an Electronically Steerable Microstrip Patch and a Novel Coplanar Waveguide (CpW) Fed Slot Antenna Array
… Then the study and design of a wideband Coplanar Waveguide (CPW)-fed slot phased array antenna is presented. In both cases the array beam scanning properties are elucidated by incorporating the measured delay line scattering parameters inside Ansys Designer simulation models and then …
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Arrowhead patch slot antenna for 5G applications
… related to 5G systems, especially those based on coplanar waveguide feeding method. Then antenna based on coplanar waveguide feed structure is designed and optimized for better input impedance match and radiation performance. Measurements of the fabricated prototype confirmed the targeted …
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Millimeter-wave low-noise amplifiers using cost-effective ion-implanted MESFETs and coplanar transmission lines
… using 0.25 $\mu$m ion-implanted GaAs MESFETs and coplanar waveguide transmission lines. It describes the development of low-noise GaAs FETs, measurement and modeling of active and passive components, circuit design, simulation, fabrication, and characterization of the completed amplifiers.
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Impedance measurements at W-band using an array of bismuth microbolometers
The voltage standing wave on a coplanar waveguide (CPW) is measured at W-band (75-110 GHz) using an array of bismuth microbolometers placed over the CPW. From this information, the impedance of the load at the end of the line can be determined in addition to the propagation and attenuation constant …
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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.
… ones. A new dual-band balanced antenna using coplanar waveguide structure is also proposed, discussed and tested; this is intended to eliminate the balanced feed network. The predicted and measured results show good agreement, confirming good impedance bandwidth characteristics and excellent …
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Embedded microvascular networks for electronically reconfigurable materials
… radio frequency wireless devices, a coplanar waveguide and a cross-polarization patch antenna. The coplanar waveguide achieves phase reconfiguration with a single serpentine channel design, while the cross-polarization antenna achieves polarization reconfiguration using dual 3D …
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Superconducting coplanar delay lines
… and measured. One is based on the conventional coplanar waveguide (CPW), and the other based on a conductor-backed coplanar waveguide (CBCPW). Systematic design work is presented in this thesis on the calculations of transmission-line parameters, the selection and optimisation of delay line …
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QUBIT COUPLED MECHANICAL RESONATOR IN AN ELECTROMECHANICAL SYSTEM
… transmon which is embedded in a superconducting coplanar waveguide (CPW) cavity. The difficulty of achieving high quality of superconducting qubit in a high-quality voltage-biased cavity is overcome by integrating a superconducting reflective T-filter to the cavity. Further spectroscopic and …
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The design and testing of integrated circuits for submillimeter-wave spectroscopy
… made of low-temperature grown GaAs embedded in a coplanar waveguide with both static and dynamic illumination. We investigated the bandwidth decrease and an increase in de photocurrent that occurs at the same bias voltages. We attribute both phenomena to a reduction of the electron capture cross …
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High Frequency Study of Magnetic Nanostructures
… measurement geometries using microstripline and coplanar waveguide as microwave transmission lines.</p> <p>In part three our aim was to study the magnetic properties of complex ferromagnetic system, especially the effect of interactions on dynamic properties of magnetic nanostructures (nanowire …
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Physics of Superconducting Travelling-Wave Parametric Amplifiers
… suitable for microstrip transmission lines and coplanar waveguide architectures. At device-level, I analyse the effect of nonlinear wave-mixing on a transmission line by using a travelling-wave coupled-mode method. The method produces key amplifier performance metrics such as gain, bandwidth and …
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Frequency and Field Strength Materials Characterization with Complementary Split-ring Resonators, Coplanar Waveguides, and the Virtual Ground Method
… include complementary split-ring resonator and coplanar waveguide instantiations. Additionally and complementary to the RF measurement systems, a ferroelectric test measurement system for high-frequency and high-power polarization vs. electric field curves was designed, built, tested, and shown …
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Development of a spring-less RF MEMS switch
… unrestrained armature, over a RF transmitting coplanar waveguide. Electrostatic actuation is used during the switching operation. The attractive force from the electrostatic field is generated by a pair of the actuation electrodes on both sides of the armature, depending on the direction of the …
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Characterization of Magic-angle Twisted Bilayer Graphene using Microwave Techniques
… the frequency shift of a standard Aluminum coplanar waveguide resonator terminated by a twisted bilayer graphene device, we can extract the contribution of the twisted bilayer graphene inductance. We expect that the experimental method can be utilized to measure MATBG kinetic inductance and …
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Hydrothermal Processing of Barium Strontium Titanate Composites on Printed Circuit Board for Thin Film Varactor Applications
… derived powder are deposited onto grounded coplanar waveguide capacitors. The dielectric constant significantly reduced, reaching as low as 18, but tunability increased to 18%.
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Synthetic aperture radar-based techniques and reconfigurable antenna design for microwave imaging of layered structures
… Based on this method, a novel reconfigurable coplanar waveguide-fed slot antenna is designed to cover several different frequency bands while keeping the antenna size as small as possible"--Abstract, page iii.</p>
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Characterization and modeling of ESD events and near-field scanning calibration structures
… A calibration structure is built from a grounded coplanar waveguide to determine the probe factor for near-field scanning applications. The effect of non-TEM modes is easily underestimated such that non-TEM fields prevent the user from determining the unwanted field suppression of probes at higher …
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Contact-type mechanical interfaces for high speed digital interconnects
… The cantilevered interconnect consists of a coplanar waveguide cross-section. The interconnect is both mechanically and electrically sound. This thesis presents aspects of mechanical contact interfaces for electrical signal testing purposes. It focuses on device interfacing, contactor tip …
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A Silicate-Based Packaging Material for 3-D Heterogeneous Integration of Microsystems
… ~0.0002 at 110 GHz. Successful fabrication of a coplanar waveguide and prototype reconstituted wafers demonstrated that the packaging material can be used to make RF devices and to enable 3D HI and WLP.
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