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.
Results
Showing 1 to 20 of 54 for “"power handling"”.
-
Power handling of liquid metal infused trenches in the EAST Tokamak
… into the lithium film via convection and the power dissipated by a lithium vapour cloud formed above the plate to produce a measurement of the total heat flux experienced by the plate and begin to benchmark the heat handling capabilities of the LiMIT design. The most extreme conditions faced …
-
Wideband, Low-Loss, High-Power Handling Diplexer for Airborne Early Warning (AEW) Systems
… low-loss (<0.5dB), wideband (4.4:1), and high-power (>6kW) handling capability. Two diplexer candidates are synthesized and characterized with the aid of a commercial circuit simulation package that includes a 3D full-wave EM solver. A semi-lumped coaxial and a digital elliptic diplexer are …
-
A doubly-fed machine for propulsion applications
… proposed, which, given the presence of AC and DC power sources, can be utilized in order to improve efficiency, weight, volume, and sizing of the rotor power electronics. In this case, a shipboard application is examined. A hardware demonstration of a control architecture is implemented, along …
-
Power System Reliability Analysis with Distributed Generators
Reliability is a key aspect of power system design and planning. In this research we present a reliability analysis algorithm for large scale, radially operated (with respect to substation), reconfigurable, electrical distribution systems. The algorithm takes into account equipment power handling …
-
An investigation of solid state high level upconverters using hybrid computing techniques
… this application with large conversion gains and power handling capacity. This thesis presents the derivation of a hybrid computer model of the upper sideband upconverter. Measurements on the hybrid computer model are used to demonstrate the factors affecting the performance of the upconverter and …
-
AlGaN/GaN HFET with composite 'slow/fast' gate
… HFETs demonstrate very low insertion loss, high power handling capability and broad range of operating temperatures. </p> <p>However, the maximum operating frequency of these switches is limited by the finite off state capacitance COFF, mainly due to a small gate-channel separation. In the …
-
High-Performance Gateless Iii-Nitride Microwave Switches
… simple integration with other components such as power amplifiers, phase shifters, arrays etc. Recent advancements in III-nitride heterostructure field-effect transistors (HFET) have led to RF switches with outstandingly low loss and high power handling capability, ideal for numerous applications. …
-
RF-MEMS switches for reconfigurable antennas
… actuation voltage, low restoring force, low power handling), packaging (contamination layers) and actuation control (high impact force, wear, fatique). This Thesis focuses on the design and control of a novel ohmic RF-MEMS switch specified for reconfigurable antennas applications. This new …
-
Novel microwave devices based on multi-port filtering networks
… diplexer in terms of performance, size, and power handling capabilities. It was found that the resonant junction diplexer is more compact with slightly higher power handling capability. Some number of diplexers were presented using the MPFNs technique. Various dual-mode resonators such as the …
-
BULK TITANIUM WAVEGUIDE- A NEW PLATFORM FOR UNIPLANAR MICROWAVE CIRCUITS AND RFMEMS
… into higher conductor loss, cross-talk and poor power handling capability. We present a new topology for planar microwave circuitry: bulk titanium waveguide. The waveguide is formed by coplanar titanium segments separated by low-loss dielectric that is planarized to the same level as the …
-
Gallium Nitride phononic crystal resonator
… these PnC GaN resonators exhibit record-breaking power handling, with IIP3 of +27.2dBm demonstrated at 993MHz.
-
Tunable Impedance Matching Network Fundamental Limits and Pracitical Considerations
… demonstrating up to a 3 dB improvement in power delivered to a planar inverted-F antenna and up to 4–5.6 dB improvement in power delivered to the iPhone™ antenna. Additionally, a single-varactor matching network is measured to achieve greater tuning range than a two-varactor matching …
-
Tunable electrically small antenna for next generation ionospheric heating
… element must be miniaturized with increased power capability. The antenna design presented, at 2.5 x 1.2 x 3 m in size, is a factor 60 times smaller than a HAARP element at 21 x 21 m in size and a factor 5 to 10 times smaller than a dipole at an equivalent frequency in linear dimension. …
-
Numerical Analysis of Helical and Log-periodic Antennas for Short Pulse Applications
… of a helical antenna are its excellent power handling capability and tunable gain. The helical antenna is widely used in many UWB applications such as Radar, satellite communication, GPS, and other short-pulse applications. High far-field gain is essential to many applications, but a …
-
Suspended stripline filters for ultrawide bandwidth and high RF power
… design, synthesis, and measurement of high peak power ultra-wideband filters in suspended stripline. Ultra-wideband pre-selector filters play a vital role in current electronic warfare systems as they are expected to cover a wide passband and handle high power simultaneously. Suspended stripline …
-
NeXtRAD antenna design: X-Band dual polarised conical horn antenna
… frequency of 8.5 GHzand a 10_ azimuth-half power beam width in both vertical and horizontal polarisations. Other requirements include peak power handling of 400 W over a 50 MHz instantaneous bandwidth and the facility to be mounted on a standard tripod. The dissertation begins by introducing …
-
Bead manipulation to enable electrically controlled wire braiding
… for less spectral crowding, jamming, improved power handling, and more efficient systems. In this thesis, through collaboration with The Charles Stark Draper Laboratory, dielectrophoretic and driven fluid flow bead manipulation methods were explored for the purpose of demonstrating the …
-
A frequency reconfigurable circularly polarized microstrip patch antenna using liquid metal microswitches
… the series loss, mechanical fatigue, and limited power handling reliability of common methods of antenna reconfiguration such as semiconductor diodes and microelectromechanical switches. The proposed microswitches consist of mercury droplets that selectively connect solid metal traces. Both …
-
RF MEMS switches : survey and analysis
… RF MEMS switches have low reliability, limited power handling capabilities, and slow switching times. Nonetheless, MEMS switches are poised to provide advantages over other switching technologies. The goal of this thesis is to understand the limits of their operation and predict their impact in …
Page 1 of 3