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 10 of 10 for “"Tunable devices"”.
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… this dissertation, liquid crystal materials and devices are investigated in meeting the challenges for photonics and communications applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are developed …
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High-Power Microwave/ Radio-Frequency Components, Circuits, and Subsystems for Next-Generation Wireless Radio Front-Ends
… integration with high-quality-factor (high-Q) tunable filters, and relevant investigations on the reliabilities of these tunable devices. It can be basically divided into three major parts:</p> <p>1.Broadband High-Efficiency Power Amplifiers. Obtaining high PA efficiency over a wide bandwidth …
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Microstructure, Tunable and Pyroelectric Properties of Laser-Ablated Ba (Zr0.25 Ti0.75) O3 Thin Films
Micro-devices such as tunable varactors and infrared sensors have been of great interest in many applications such as wireless communication and thermal imaging. Thin film capacitors made of ferroelectric materials have been widely studied for use as active elements in those devices due to their …
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Strain-tuning of periodic optical devices : tunable gratings and photonic crystals
The advancement of micro- and nano-scale optical devices has heralded micromirrors, semiconductor micro- and nano-lasers, and photonic crystals, among many. Broadly defined with the field of microphotonics and microelectromechanical systems, these innovations have targeted applications in …
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Digital and Microwave Superconducting Electronics and Experimental Apparatus
… results for a set of on-chip microwave devices, including bias tees, filters, detectors, couplers, and delay lines. In addition, by using the modeling developed for the memory, we make this set of microwave devices tunable through thermally controlling their kinetic inductance. To …
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Lead - Free Piezoelectric Based Magnetoelectric Composites
… for nanoscale and flexible magnetoelectric devices. Self-biased ME effect was investigated in lead-free three-phase laminate composites. This effect is characterized by non-zero remanent ME responses at zero magnetic bias field (Hbias). It was revealed that the self-biased ME effects can be …
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EFFECTS OF STRAIN ON DIELECTRIC PROPERTIES OF FERROELECTRIC Ba0.5Sr0.5TiO3 FILMS
… deal of attention on applications in miniature tunable microwave components with high performance and cost reduction, such as phase shifters, tunable oscillators, delay lines, and antennas. These tunable devices require large change in the dielectric constant with applied field and a low loss at …
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Preparation and Characterization of Ferroelectric Thin Films for Tunable and Pyroelectric Applications
… wide applications in pyroelectric detectors and tunable devices. In the present work, pulsed laser deposition (PLD) technique has been employed to deposit ferroelectric Ba(Ti0.85Sn0.15)O3 (BTS) thin films and heterostructures. BTS thin films have been successfully deposited on LaNiO3 …
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Tunable Liquid Crystal Photonic Devices
… optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous polymer-dispersed liquid crystal (PDLC), polymer network liquid crystals …
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Graphene Integrated Metamaterial Devices for Terahertz Modulation
… speed, electrically controllable modular THz devices, which can be implemented with standardised sources to build versatile THz systems. Due to THz frequencies lying outside of the typical operation range for the mature microwave and photonic technologies, alternative approaches are required …