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 129 for “"antenna arrays"”.
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Multiple-frequency antenna arrays
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1964
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Exploitation of Modes in Circular Antenna Arrays
In this thesis modes on circular antenna arrays are investigated and exploited. Circular antenna arrays are specifically chosen because of their symmetric structure which enables continuity of surface currents and symmetric mutual coupling between elements of the array. This makes circular array …
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Novel decoupling networks for small antenna arrays
Antenna arrays with multiple ports are widely used in space-time techniques like diversity reception, MIMO technique, adaptive beamforming or nulling, and direction finding. In the case of size-limited platforms, multiport antenna arrays have element spacing significantly smaller than half …
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Non-Radiative Calibration of Active Antenna Arrays
Antenna arrays offer significant benefits for modern wireless communication systems but they remain difficult and expensive to produce. One of the impediments of utilising them is to maintain knowledge of the precise amplitude and phase relationships between the elements of the array, which are …
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Adaptive Antenna Arrays Applied to Position Location
… channel must be developed. The use of adaptive antenna arrays is one area that shows promise for improving capacity of wireless systems and providing improved safety through position location capabilities. These arrays can be used for interference rejection through spatial filtering, position …
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Blind adaptive antenna arrays for mobile communications
Adaptive antenna arrays have tremendous potential for increasing the capacity of mobile communications, by reducing co-channel interference, multipath, and noise. Blind adaptive algorithms, that is, algorithms which do not require a training sequence, are investigated and compared in this study. …
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Direction of arrival estimation using antenna arrays
… direction-of-arrival measurement system using an antenna array operating at 2050 MHz. The first phase of the project is an extensive study of various high resolution DOA estimation algorithms. The algorithms studied include subspace-based techniques such as the MUSIC (MUltiple Signal …
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Analyzing modal decomposition data of finite antenna arrays
Traditional antenna array theory is well suited for guiding the design of very large, uniform arrays. When an array is large enough one can often approximate that the array is of infinite extent, greatly simplifying the analysis of the structure and significantly reducing the cost of simulation. …
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Adaptive Antenna Arrays for Satellite Personal Communication Systems
… capacity. To overcome this problem, adaptive antenna arrays on handheld terminals are proposed. This technique is believed to be better than omni-directional antennas which radiate in all directions. Adaptive antenna arrays have the ability to adapt to the changing environment and null out the …
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Application of Cross-Correlation Techniques to Linear Antenna Arrays
Made available in DSpace on 2014-12-04T21:03:39Z (GMT). No. of bitstreams: 1 6402922.pdf: 3936007 bytes, checksum: 688b9a1419d0f515f0455a566cec6588 (MD5) Previous issue date: 1963
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Architectures and system design for digitally-enhanced antenna arrays
… processing efforts associated with phased array antennas. Fundamentally, these techniques have served to provide additional levels of convenience and performance over the fully analog counterparts, without specifically addressing the underlying design of the analog hardware aspects of the arrays. …
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Optimization of Aperiodically Spaced Antenna Arrays for Wideband Applications
Over the years, phased array antennas have provided electronic scanning with high gain and low sidelobe levels for many radar and satellite applications. The need for higher bandwidth as well as greater scanning ability has led to research in the area of aperiodically spaced antenna arrays. …
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Improving port isolation in dual-polarized microstrip patch antenna arrays
… degradation in dual-polarized microstrip arrays. The advantages of using dual-polarized antennas are the frequency band reuse and simultaneous receive/transmit capability. To fully exploit these advantages the isolation between orthogonally polarized ports must be maximized and radiation …
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Wideband Low-Profile Antenna Arrays: Fundamental Limits and Practical Implementations
… a growing need for high performance, compact antennas. Low-profile wideband phased arrays are of particular interest, and have recently been shown to be capable of extremely large bandwidths. However, the size, weight, and cost of phased arrays still makes them impractical for many …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
Light-weight phased array antennas for aerospace and mobile applications require utilizing the same antenna aperture to provide multiple functions with dissimilar radiation pattern specifications (e.g., multiband operation for communications and tracking). Multi-functional antennas provide …
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Multi-beam Antenna Arrays for Base Stations in Cellular Communication Systems
Multi-beam antennas will play an increasingly important role in future communications systems such as the fifth generation (5G) and sixth generation cellular systems. There will also be a shift to higher frequencies where more spectrum is available to accommodate wide-band high data rate systems. …
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Time -Domain Finite -Element Simulation of Large Antennas and Antenna Arrays
… is then applied to the simulation of large antennas and antenna arrays. For large finite arrays, a specialized array solver is developed for an even better efficiency. Finally, an explicit TDFEM is derived from the DFDD and its advantages and disadvantages are discussed.
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Room-Temperature Terahertz Detection Based on Graphene and Plasmonic Antenna Arrays
… of graphene and the function of plasmonic antenna arrays which boost the interaction between THz waves and graphene. Graphene has been demonstrated as a promising material for THz detection. However, the challenge is its insufficient light absorption that largely limits the responsivity. …
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High Angular Resolution Beam Steering Terahertz Antenna Arrays for Imaging Applications
Terahertz antenna arrays can produce Terahertz electromagnetic waves that can be steered by electronic control. They are a promising technology for many applications, including imaging, radar, communications and other sensing applications due to bandwidth availability, penetration of dielectric …
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Multiplexing, scheduling, and multicasting strategies for antenna arrays in wireless networks
A transmitter antenna array has the ability to direct data simultaneously to multiple receivers within a wireless network, creating potential for a more integrated view of algorithmic system components. In this thesis, such a perspective informs the design of two system tasks: the scheduling of …
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