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 23 for “"antenna gain"”.
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Resource allocation and scheduling for communication satellites with advanced transmission antennas
… service area, an optimized method of agile antenna gain patterning and beam scheduling is required to greatly improve the efficiency of transmission and power management. In this thesis, we jointly optimize resource allocation/scheduling, congestion control and antenna gain patterning for …
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Measurement of Antenna Performance in Analog LMR Systems Using PL Tone Analysis
We are interested in measuring the in situ antenna performance in analog land mobile radio (LMR) FM systems. The gain (efficiency and directivity) and self-impedance of an antenna sufficiently characterize its performance and a number of traditional methods exist to measure these quantities. …
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Optimal Reconfiguration of Thermally Distorted Wire Mesh Reflectors for Large Space Antennas
… reflector surface precision for large aperture antennas deployed in space has not been completely resolved. This feasibility study advances an approach that represents a fundamental divergence from conventional techniques. Specifically, an underconstrained structural system in the form of a wire …
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Enhanced plasma wave spectral asymmetries
… The power spectra are corrected for the antenna gain frequency dependence. The power asymmetry is attributed to linear convective amplification of the plasma waves, so that waves observed propagating parallel and antiparallel to the radar line-of-sight have originated at different …
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Metamaterial Enhanced Wireless Power Transmission System
… Frequency Structure Simulator (HFSS) to improve antenna gain and thereby increase WPT system performance. A simple WPT demonstration system using microstrip patch antennas (MPAs) confirmed the benefits of the GRIN MTM lens. The WPT demonstration system, MPAs, and GRIN MTM lens were constructed …
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Reconfigurable Wideband Circularly Polarized Microstrip Patch Antenna for Wireless Applications
… developments of rectangular microstrip patch antenna to have circular polarization agility with wideband performance, for wireless applications are presented. First, a new technique to achieve circularly polarized (CP) probe feed single-layer microstrip patch antenna with wideband …
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Array Processing for Mobile Wireless Communication in the 60 GHz Band
… and strong attenuation due to oxygen absorption. Antenna arrays have been proposed as a means of combating these effects. This thesis provides an analysis of array processing for communication systems operating in the 60 GHz band. Based on measurement campaigns at 60 GHz, deterministic modeling of …
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A clutter power computation procedure for airborne Doppler radar
… to accept any surface radar cross section, antenna gain, and pulse type (a matched filter receiver is assumed) as a function of range and azimuth. It was discovered that the algorithm could be executed with significantly less computer time if the integration surface area was reduced by …
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Null Depth Trade Off for Output Power Reduction in a Downlink Adaptive Antenna Array
… transmitted power reduces the effective antenna gain, increases interference in other directions and has implications on the dimensioning of the power amplifiers feeding the antenna elements. In addition, the power distribution among the antenna array elements is no longer equal. The …
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Adaptive beamforming of steerable array monopole antenna for WLAN application
… Therefore, a smart steerable patter array antenna is highly recommended for new generation communication. Using low-cost steerable passive monopole array antenna can achieve a beam steering and high gain. Loading an additional reactance to the passive elements of the array are changed the …
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Microwave Radiometer (MWR) Evaluation of Multi-Beam Satellite Antenna Boresight Pointing Using Land-Water Crossings, for the Aquarius/SAC-D Mission
… For this reason, knowledge of the MWR antenna beam footprint geolocation is crucial to mission success. In particular, this thesis addresses an on-orbit validation of the MWR antenna beam pointing, using calculated MWR instantaneous field of view (IFOV) centers, provided in the CONAE …
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Integration of Wireless Sensor Network with CubeSat Satellite System for Enhanced Agricultural Monitoring
… highlight concrete radio-engineering factors (antenna gain or placement, cabling, mounting stability) for robust deployments and future orbital campaigns.
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Compact Doppler radar system for heart rate detection
… to higher power systems where obstructions and antenna gain similarly impact the signal power available for heart motion detection. A 2.40Hz microwave Doppler radar system was designed for the required assessments, with several transceiver variations fully integrated on printed circuit boards …
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Characterization of the spin and attitude of the ESA Huygens probe during its descent onto Titan using the engineering dataset
… link’s power level using the accurately known antenna gain pattern and a comparison between the Huygens mission and the more fully instrumented SM2 test probe which was dropped in the Earth’s atmosphere in 1995. Some basic dynamic modelization has also been done to investigate likely behaviours …
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Enabling Hybrid Optical-Microwave Space Communications with Optically Transparent RF Components Using Indium Tin Oxide (ITO)
… and performance of optically transparent antennas using Indium Tin Oxide (ITO) films on alkaline earth boro-aluminosilicate glass for transparent radio-frequency (RF) applications in space communication systems. Addressing the limitations of traditional metal-based antennas—particularly …
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Development of Efficient Techniques for the Analysis and Design of Antennas in Dual-Reflectarray Configuration
… the analysis and design of printed reflectarray antennas. The main part of the work is focused on the analysis of dual offset antennas comprising two reflectarray surfaces, one of them acts as sub-reflector and the second one acts as mainreflector. These configurations introduce additional …
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Single Layered Periodic Structure Loaded Textile Patch Antennas
… Layered Periodic Structure Loaded Textile Patch Antenna with probe feed excitation. Specifically, this thesis is concentrated on the application of wearable antenna arrays with space suit, since this thesis has collaboration with the University of North Dakota (UND) Space Suit Laboratory in the …
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Design of an HF transmit antenna for bistatic ionospheric soundings in Antarctica
… was to design a suitable transmitter antenna such that propagating skywave signals could successfully be received by the SANAE SuperDARN radar some 2090 km away. A transmitter beacon with an operating frequency of 12.57 MHz and a maximum 1 W power output has already been designed …
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Critical Analysis Of Transmitarray Antenna Design
In recent years, transmitarray antenna concept attracts growing interests of many scientists in the antenna area. It combines the favorable features of the lens antenna that are based on optical theory and the microstrip arrays that are based on array theory, leading to a low profile design with …
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