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 31 for “"Microwave Devices"”.
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Optimization of microwave devices
… techniques for the improvement of the microwave devices performance. In particular, the technique proposed considers the Particle Swarm Optimization algorithm and applies such an algorithm to different devices. Different techniques are developed to connect the optimization with an …
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Reconfigurable tunable microwave devices using liquid crystal.
… past decades, the applications of communication devices have extended widely, from AM radio receivers initially to newly developed GPS, smart mobile phones, radars, wireless LANs, satellite communications and implantable medical devices. The shortage in the available frequency spectrum for radio …
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Nonreciprocal microwave devices using parametric frequency conversion
… to characterize the performance of nonreciprocal microwave devices enabled by parametric frequency conversion. Although such devices have been explored somewhat superficially in the 1960s, resurgent interest in low-noise nonreciprocal components has motivated new research in parametric frequency …
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Anode Materials for High Power Microwave Devices
The term directed energy relates to devices capable of generating highly focused energy sources, including lasers, particle beams and microwaves. Extensive research is continuingly conducted into such devices’ frequency spectrum in order to increase their power levels to develop new applications. …
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Novel microwave devices based on multi-port filtering networks
… communication systems. It is interesting to the microwave filtering component designers as it reduces the footprint, cost and structural size. One potential application of this concept is diplexers/multiplexers. The conventional structure of joining two or more filters using the transmission …
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Physics-informed machine learning for the modeling and inverse design of microwave devices
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices
Modern high frequency electronic devices are continually becoming smaller in area but capable of generating higher RF power, thereby increasing the dissipated power density. For many microwave devices, for example the planar Gunn diode, standard thermal management may no longer be sufficient to …
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Digital and Microwave Superconducting Electronics and Experimental Apparatus
… complex, the traditional reliance on off-chip microwave components has become unsustainable. In this thesis, we present the design and experimental results for a set of on-chip microwave devices, including bias tees, filters, detectors, couplers, and delay lines. In addition, by using the …
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Microstruture & High Frequency Property of Fe- & Co- Based Nano-Grain Thin Films
… in various fields of high-speed electronics and microwave devices. In order to apply magnetic thin films at high frequency range, it is essential to measure the high frequency permeability and understand the electromagnetic properties that can control the high frequency permeability. In this …
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Electromagnetic characterization of carbon nanotubes and their composites for microwave sensing applications
… is applying carbon nanotube materials in microwave devices, particularly for sensing applications. In this thesis, a brief overview of carbon nanotubes is given, along with a survey of some current research in applying carbon nanotube materials in microwave sensing applications. A …
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Investigation of Spinel Ferrite Thin Films for Spintronics Applications
… for various device applications, including microwave devices, memory chips, transformer cores, antenna rods, and millimeter-wave integrated circuitry. These materials are attractive due to their extremely high specific resistance, high saturation magnetization, high Curie temperature, and …
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Low-temperature magnetophotoluminescence characterization of high-purity gallium arsenide and indium phosphide
… a wide variety of electronic, optoelectronic and microwave devices. The large binding energy differences of acceptors in GaAs and InP make possible the identification of those impurities by low-temperature photoluminescence without the use of any magnetic field. However, the sensitivity and …
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Tunable microwave filters using ferroelectric thin films
Frequency agile microwave devices based on Barium Strontium Titanate (BST) thin films have gained a lot of interest in recent years. The frequency agility of the ferroelectric devices is based on the external DC electric field controlled permittivity of BST thin film. In this research work, several …
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Nonlinear and Time-Modulated Metamaterials: Applications at Microwave Frequencies
… wave phenomena that open opportunities for the microwave engineering community, including the creation of nonreciprocal devices, frequency conversion, and more. In this dissertation, we explore, investigate, design, and fabricate metamaterials that open new applications for nonlinearity-based …
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Analysis of Zincblende-Phase GaN, Cubic-Phase SiC, and GaAs MESFETs Including a Full-Band Monte Carlo Simulator
… have great potential as high-power microwave devices, many gaps remain in the knowledge about their properties. The simulations in this work are designed to give insight into the performance of microwave high-power devices constructed from the materials in question. The simulation …
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Combined Microwave, Ultrasound and Strain Imaging for Breast Tissue Characterization
… stiffness between tumours and normal tissues. Microwave imaging is an emerging modality that is appealing because it is low-cost and highly safe for patients, as it does not emit harmful radiation. A promising improvement in the field of breast cancer imaging is to utilize the imaging …
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An investigation into controlling the growth modes of ferroelectric thin films using pulsed laser deposition and RHEED
… are widely considered for tunable microwave applications, the reduced small dimensions leading to low tuning voltages. The incipient ferroelectric strontium titanate is an ideal solution for tunable microwave devices, particularly in conjunction with high temperature …
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Space-Charge Saturation and Current Limits in Cylindrical Drift Tubes and Planar Sheaths
… role in many areas of physics. In high-power microwave devices using high-current, relativistic electron beams, it places a limit on the amount of radiation a device can produce. Because the beam's space-charge can actually reflect a portion of the beam, the ability to accurately predict the …
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