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 117 for “"UHF"”.
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Antenas pequeñas en UHF
… las comunicaciones satelitales y los sistemas UHF RFID; proponiendo soluciones novedosas para mejorar sus prestaciones como así también facilitar su diseño. Se presentarán dos antenas cuyo rasgo distintivo es que irradian ondas con polarización circular y están diseñadas a partir de elementos …
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UHF RFID Antenna Impedance Matching Techniques
… (RFIC). RFID tags in the ultra-high frequency (UHF), industrial, scientific and medical (ISM) 902-928MHz band and global Electronic Product Code (EPC) 860‑960MHz band are powered passively (power extracted from carrier wave) and cost less than 15 cents per tag. Low cost UHF ISM RFID tags are an …
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Logaritmicko-periodická anténa pro UHF pásmo
… antény pro měření v pásmu UHF. Anténa je v práci představena spolu s návrhovými vztahy, simulována a optimalizována pro minimalizaci vstupního činitele odrazu a maximalizaci zisku. Dále je doplněna krytem a výsledky simulací jsou porovnány pro anténu bez krytu.
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UHF Energy Harvesting and Power Management
… to operate these devices off harvested energy. UHF energy harvesting, as an enabling technology for the UHF RFID, stands out amongst other energy harvesting approaches as it does not heavily rely on the natural surrounding environment and also offers a very good wireless operating range from its …
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Enhancing Signal Coverage for UHF RFID Systems
… long been one of the most crucial problems in UHF RFID systems. In this thesis, the problem is tackled using a combination of antenna design, mathematical modelling and algorithm development. A novel UHF RFID reader antenna with 2D beam-scanning ability, a wide axial ratio (AR) beamwidth and …
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Characterization of redundant UHF communication systems for CubeSats
… of two different Ultra High Frequency (UHF) radios damaging each other on orbit, determining how to mitigate the damage, and testing to prove the radios are protected by the mitigation. The example case is the Microwave Radiometer Technology Acceleration (MiRaTA) CubeSat. We conducted a …
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Optimum Performance of UHF RFID Tags in Dielectric Environment
… High Frequency Radio Frequency Identification (UHF RFID) technology has gained prominence in recent years. It is being deployed extensively in supply chain and asset tracking by retailers to better control their inventory. The main drawback of UHF RFID tag antenna is that it is sensitive to the …
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Studio e sviluppo di sistemi RFID in banda UHF
… (RFID) applications operating in the UHF band has been supported by both the request for greater interrogation ranges and greater and faster data exchange. UHF-RFID systems, exploiting a physical interaction based on Electromagnetic propagation, introduce many problems that have not …
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Design and characterization of a UHF diplexer/antenna combination
Wireless communication systems are important in modern day life. Applications of wireless communication systems are used everywhere around the world, such as cell phones, wireless entertainments, satellites and navigation services. Because of the high volume usage of various wireless signals' …
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A VHF/UHF Voltage Controlled Oscillator in 0.5um BiCMOS
The dramatic increase in market demand for wireless products has inspired a trend for new designs. These designs are smaller, less expensive, and consume less power. A natural result of this trend has been the push for components that are more highly integrated and take up less real estate on the …
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A UHF Multimode Array Feed for the Westford Radio Telescope
A novel UHF Multimode Array Feed (MMAF) has been created for MIT’s Westford Radio Telescope. The MMAF is a dual-linear focal plane array installed concentrically with the existing QRFH feed on the telescope, enabling a combined system capable of transmit or receive on UHF radar and satcom …
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Nonlinear ionospheric propagation effects on UHF and VLF radio signals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Graphical real-time simulation tool for passive UHF RFID environments
… tool, RFID Vis, that is used to simulate a UHF RFID environment. The simulation tool simulates environments containing to pallets of cases as is common in parts of the supply chain. The simulation tool consists of two parts, a graphical front end which interfaces with the user as well as …
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A concept for wildlife tracking using ultra high frequency (UHF) radio
… In this study, a band of Ultra High Frequency (UHF) with a frequency 315MHz is used as a transmitter. While a encoder HT12E is used as a function of generate a data signal to the RF Transmitter module 315MHz to transmit. The signal sent by the transmitter detected by Yagi antenna as a receiver …
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A Low-Cost, Scalable Platform for Sub-Centimeter UHF RFID Positioning
High-precision localization is a technology that has started to make areas from autonomous vehicles to packing robots more efficient and accurate. While there are many approaches to localization, RFID micro-location is a growing technology that has been shown to be fast and robust, and can leverage …
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The excitation of UHF signals by partial discharge in gas insulated substations
… is an investigation of the ultra-high frequency (UHF) signals excited by partial discharge (PD) sources inside gas insulated substations (GIS). PD is indicative of defects in the insulation system and by using couplers mounted at intervals along the GIS, the corresponding bursts of UHF signal can …
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UHF-SAR and LIDAR Complementary Sensor Fusion for Unexploded Buried Munitions Detection
Given the UHF bands properties of foliage and round penetration, a UHF-SAR image contains both above- and below-surface scatterers. The problem of detecting sub-surface objects is problematic due to the presence of above-surface scatterers in the detection images. In case of a single-pass anomaly …
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VHF and UHF radar observations of postsunset e-region turbulence with ALTAIR
U of I Only Restriction set for Item 119541 on 2021-10-08T16:28:20Z with date by astein@illinois.edu.
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