Sökning: "ultra-wideband"
Visar resultat 11 - 15 av 60 avhandlingar innehållade ordet ultra-wideband.
11. Dielectrically Loaded Quad-ridge Flared Horns for Ultra Wideband Reflector Feed Applications in Radio Astronomy
Sammanfattning : Reflector-based radio telescopes are used as tools for observations in both radio astronomy and space geodesy. To observe the weak sources in space, highly sensitive receivers, fronted by optimized reflector feeds, are therefore needed. LÄS MER
12. Low-Noise Amplifier Design for Ultra-Wideband Systems
Sammanfattning : The low-noise amplifier (LNA) remains a critical block in every receiver front-end. As the development of the widcband, low-power and low-cost wireless systems continues, new LNA topologies and design methodologies have become one of the most interesting challenges in the field of radio frequency system design. LÄS MER
13. On the Physical Layer of Ultra-Wideband Systems
Sammanfattning : This licentiate thesis consists of two published conference papers, onetechnical report, and an introduction. The focus is on communication at bitrates of 100 Mbps and higher for single-user systems at short range up to 10meters. LÄS MER
14. THz Ultra-wideband Passive Devices: Design, Simulation and Characterization
Sammanfattning : The last decades have seen an increasing interest in the THz research field, leading to a substantial improvement in technology and the emergence of new applications. In particular, the research on radio astronomy instrumentation has pushed millimeter and sub-millimeter technology boundaries and redefined state of the art. LÄS MER
15. Sub-Nyquist Sampling Impulse Radio UWB Receivers for the Internet-of-Things
Sammanfattning : In the era of Internet-of-Things, the demand for short range wireless links featured by low-power and low-cost, robust communication and high-precision positioning is growing rapidly. Impulse Radio Ultra-Wideband (IR-UWB) technology characterized by the transmission of sub-nanosecond pulses spanning up to several GHz band with extremely low power spectral density emerges as a promising candidate. LÄS MER