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 33 for “"Ultra-wide band"”.
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Sub-optimal Ultra-wide Band Receivers
Ultra-wide Band (UWB) has sparked a lot of interest lately from the industry and academia. The growing capacity of the wireless industry is requires a new communication system that satisfies the high data rate which does not interfere with existing RF systems. UWB promises to be this new …
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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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High-speed data conversion for digital ultra-wide-band radio receivers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Radio over fibre distribution systems for ultra-wide band and millimetre wave applications
Short range wireless technology such as ultra-wideband (UWB) and 60 GHz millimetre wave (mm-wave) play a key role for wireless connectivity in indoor home, office environment or large enclosed public areas. UWB has been allocated at the frequency band 3.1-10.6 GHz with an emission power below -41.3 …
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Design of microstrip ultra wide band antenna with two notch filters for wireless communication
… of the antenna for WiMAX and WLAN frequency band rejection. The antenna is simulated using the commercially available CST Microwave Studio software. The slots dimensions are systematically calculatedand optimized to achieve the desired band rejection responses. A multi-state reconfigurable …
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Spectrum shaping and its application: spread-spectrum clock generator and circuits for ultra wide band
… in which the transmitted signal is spread over a wide frequency band, much wider, in fact, than the minimum bandwidth required to transmit the information being sent. Part I of this dissertation deals with Spread-Spectrum Clock Generators (SSCG) aiming at reducing Electro Magnetic Interference …
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The design and analysis of a linear low profile ultra-wide band tightly coupled U-slot microstrip antenna array
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Radio wave imaging using Ultra-Wide Band Spectrum Antennas for Near-Field Applications. Design, Development, and Measurements of Ultra-Wideband Antenna for Microwave Near-Field Imaging Applications by applying Optimisation Algorithms
The emergence of Ultra-wideband (UWB) technology application has yielded tremendous and vital impacts in the field of microwave wireless communications. These applications include military radar imaging, security screening, and tumour detection, especially for early detection of breast cancer. …
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UWB antenna using indium tin oxide (ITO)
… scale of frequency resulted in the usage of ultra wide band (UWB) frequency which ranged from 3.1 GHz to 10.6 GHz. The patch antennas offer a potential solution for narrowband and with some modifications and researches done before, it does applicable for the ultra-wide band applications. It …
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Headtrack: Tracking head orientation using wireless signals
… on the torso and the headset using the ultra-wide band (UWB) radios. Such a wearable not only enables portability but also mobility by decoupling the user's head motion from the body motion. Although the ultra-wide band radios have a 1GHz bandwidth and high-speed clocks, they are unable …
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Synchronization in Impulse Based Ultra Wideband Systems
In Impulse Radio based Ultra Wide Band (UWB) systems, where sub-nano second pulses are used, synchronization is very challenging because of their short pulse duration and very low duty cycle. Coherent detection of ultra wide-band signals requires complex channel estimation algorithms. In impulse …
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GPR propagation simulation and fat dipole antenna design
… second application is to model and fabricate an ultra wide-band antenna with implementation of the fat dipole design. The design considerations applied to improve antenna performance include antenna feed configurations, substrate width, aperture dimension, cavity implementation, terminating …
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Ultra-wideband phased array radar for short-range imaging applications
Ultra-wide band (UWB) technology, as defined by the Federal Communication Commission (FCC) on February 2002, refers to signals or systems that have bandwidth ≥500 MHz or instantaneous fractional bandwidth ≥0.20 [2]. Compared to the conventional narrowband radar that operates with the same centre …
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Remote cardiac monitoring using radar
… and security. In order to study this problem, an ultra wide band (UWB) pulse radar and a fixed-frequency amplitude based radar were constructed and evaluated. The UWB radar was not reliable and did not produce repeatable results, but the fixed-frequency radar successfully recorded heartbeat …
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Enhancing the bit error rate performance of ultra wideband systems using time-hopping pulse position modulation in multiple access environments
Ultra-Wide Band (UWB) technology is one of the possible solutions for future short-range indoor data communication with uniquely attractive features inviting major advances in wireless communications, networking, radar, imaging, and positioning systems. A major challenge when designing UWB systems …
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Cooperative communications in wireless networks : novel approaches in the mac layer
… in a special type of wireless networks, namely ultra wide-band (UWB) networks, for the first time in the literature. The importance of cooperation schemes in UWB is the promising potentials of UWB for developing a robust and high performance wireless infrastructure. Secondly, we design a novel …
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Photonic RF signal processors
… by in-fiber RF signal processors for processing ultra wide-band, high-frequency signals directly in optical domain make them attractive options for applications in optical networks and wide-band microwave signal processing. However, the principal drawbacks which have been demonstrated so far in …
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A Frequency-Modulated Continuous Wave-Based Boundary Detection System in a Small PCB Profile
… and provide help to the elderly if they fall. Ultra-wide band signals for a monitoring system is an excellent choice since it has low enough power to not interfere with other medical and household electronics as well as being able to transmit data to a central monitoring unit. One part of this …
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Band Offset Measurements of ε-(InxGa1-x)2O3/AlN using X-ray Photoelectron Spectroscopy
… advanced electronic applications, such as deep ultraviolet photodetectors, high-electron-mobility transistors, and high-power electronic devices, InGaO/AlN heterojunctions hold significant promise due to their ultra-wide band gap, tunable polarization properties, and optimized spectral response. …
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