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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 314 for “""Leaky Wave Antenna"”.
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Compact Leaky Wave Antenna Using Ferroelectric Materials
Leaky wave antenna continuously attracts a lot interests for tuning the radiation direction over a large angle. Various types of leaky wave antenna have been developed since 1940. However, most of these leaky wave antennas suffered from their excessive volume and the required wide range of …
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Advancing 5G Coverage: Novel Methods for Metasurface Characterization and Leaky-Wave Antenna Reconfigurability
… reconstruction and pattern reconfigurability in leaky wave antennas (LWAs). Metasurfaces offer potential coverage enhancement by signal manipulation. The incident field reconstruction method efficiently analyzes and optimizes MSs, addressing traditional limitations. Using numerical superposition …
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High-efficiency Waveguide Tunable Leaky-wave Antennas and Phase-shifters
… one can increase the radiation efficiency of leaky-wave beam-steerable antennas. In this effort, both frequency and fixed frequency scanned leaky-wave antennas are considered. Specifically, we discuss the design and implementation of a slow-wave frequency-scanned leaky-wave antenna that can …
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Time series analysis of indoor millimetre wave distributed antenna systems
… and the high data rate demands, millimetre wave (mmWave) technologies have emerged as one of the strongest contenders for the delivery of future wireless applications. Nonetheless, due to their shorter wavelengths when compared to traditional microwave transmissions, the wireless signals at …
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Antenna-coupled Infrared And Millimeter-wave Detectors: Fabrication, Measurement And Optimization
Antenna-coupled detectors provide uncooled, cost-effective solutions for infrared and millimeter-wave imaging. This work describes the design, fabrication, measurement, and optimization of several types of antenna-coupled detectors for LWIR (8 - 12 µm) and 94 GHz radiation. Two types of …
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Antenna-coupled Tunnel Diodes For Dual-band Millimeter-wave/infrared F
The infrared and millimeter-wave portions of the spectrum both have their advantages for development of imaging systems. Because of the difference in wavelengths, infrared imagers offer inherently high resolution, while millimeter-wave systems have better penetration through atmospheric aerosols …
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Metal-insulator-insulator-metal plasmonic waveguides and devices
Metal-insulator-metal (MIM) plasmonic waveguides have been proposed for highly integrated subwavelength structures. In this work, waveguiding and coupling of surface plasmon polaritons (SPPs) within finite planar MIM plasmonic waveguides are examined both theoretically and experimentally. Gain …
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Propagation of Leaky Waves in Free Surfaces and Grating Structures on (100)-Cut Gallium-Arsenide
… understand the details of propagation of the leaky wave through metal grating structures in $\{$100$\}$-cut GaAs. This objective was met by first understanding wave propagation in free-surface GaAs and subsequently exploring a buried bimetallic electrode structure which will present minimum …
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A compact short-wave receiving antenna for use in high-noise areas
An antenna has been developed with a signal-to-noise performance that is better than that of a typical Rhombic antenna during local thunder storms. Although the design is of general application to the reception, in high-noise areas, of long distance transmissions, this work deals in particular with …
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Directive antenna using metamaterial substrates
Using a commercially available software(CST Microwave Studio®), two kinds of simulations have been carried out on different metamaterials in the microwave regime. One is transmission and reflection of a unit cell in a waveguide, and the other is parallel plate slab farfield radiation. The …
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Novel Antenna Beamsteering for Wireless Applications
… work on the design and development of novel antenna capable of electronic beamsteering1 for various wireless applications. Such antennas aim to change the direction of their radiation patterns and directivities, electronically and dynamically, in a fast and efficient manner without the need …
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Terrestrial radio wave propagation at millimeter-wave frequencies
This research focuses on radio wave propagation at millimeter-wave frequencies. A measurement based channel characterization approach is taken in the investigation. First, measurement techniques are analyzed. Three types of measurement systems are designed, and implemented in measurement campaigns: …
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Methods in wave propagation and scattering
Aspects of wave propagation and scattering with an emphasis on specific applications in engineering and physics are examined. Frequency-domain methods prevail. Both forward and inverse problems are considered. Typical applications of the method of moments to rough surface three-dimensional (3-D) …
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Design and analysis of ultra-wide band and millimeter-wave antennas
Ultra-wideband (UWB) antennas and 60-GHz millimeter-wave antennas and arrays are analyzed and designed in this thesis for developing high-speed short-range wireless communications. Firstly, a probe-fed crossed circle-disk monopole UWB antenna with stable omnidirectional radiation pattern was …
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