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 44 for “"Array Antenna"”.
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Development of wideband phased array antenna
… the range from 4 to 8 GHz requires compact antenna to provide desirable characteristic over whole operating band. This project consists of two designs; first design is presented with optimum geometry of an ultra wideband circular patch antenna. To achieve an UWB characteristic, a patch …
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An open source array antenna toolbox implementation
… transmission of radio waves by means of phased array antennas was demonstrated. Since then, the further development of phased array radars was largely driven from a military point of view, with operational phased array systems implemented as far back as the second World War. In recent times, …
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Array antenna synthesis including element and feed coupling
Precise radiation pattern control for an array antenna requires precise control of array element excitations. One application is that of low side lobe patterns. Classical synthesis methods for the desired pattern may not be realized in practice due to coupling effects. Coupling occurs in two forms: …
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Switched beam array antenna for 2.45 GHz RFID localisation
… reader consists of a microstrip switched beam array antenna. The array antenna allows the estimation of the angular position of the tag. The use of two or more readers provides the tags position by triangulation. The array antenna provides other advantages such as improved read range and …
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Analysis of phased array antenna radiation patterns including mutual coupling
… of expressing the radiation patterns of phased arrays in closed form that include the effects of radiated mutual coupling are investigated. The two basic methods considered are the classical array analysis method and the active element pattern methods. The theoretical derivations of the active …
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Digital Control Board for Phased Array Antenna Beam Steering in Adaptive Communication Applications
… techniques is spatial filtering through planar antenna array beam forming.</p> <p>This thesis describes the development of a digital system that adaptively controls a phased array antenna. The radiating structure of the phased antenna array is tetrahedral-shaped and contains four antenna …
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Design and analysis of reconfigurable phased array antenna for wireless local area network applications
… REQUEST.] Due to the large demand in designing antennas that have high performance with low cost, this work proposes a design of reconfigurable phased array antenna operating at the two frequency bands specified by the Federal Communication Commission (FCC) for Wireless Local Area Network (WLAN) …
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Simulation of a Wireless Communication Channel to Determine a Best Topology for a Base Station Array Antenna
This thesis presents simulation data on array operation in wideband communication systems. It is shown that array structures with closer inter-element spacing outperform structures with much larger inter-element spacing. It is also shown that circular structures outperform linear structures. This …
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Design and Simulation of a Two-Dimensional Beam Steered Millimeter-Wave Phased Array Antenna at W-Band (75 – 110 GHz, respectively 4 – 2.7 m)
Antennas play a significant role in wireless communication systems and have a direct impact on their performance. In particular, Millimeter-wave systems have gained popularity in the wireless communication sector in response to rising demand for greater throughputs, reduced interference, and …
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Microstrip patch array rectenna with harmonic suppression capability for energy harvesting application
This research proposes a microstrip patch array rectenna for Radio Frequency (RF) energy harvesting at 2.45 GHz. Energy harvesting is a process where energy is derived from external sources which is captured and converted into power supply. External source being used in this research is RF energy. …
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Miniaturized, Directional Antennas For Wireless Power Transfer
… wireless power transfer. Next, two miniaturized antennas, an electrically small, circular polarized parasitic array antenna, and a miniaturized circularly polarized 2x2 array antenna, are introduced for possible use as wireless power reception antennas. Each antenna utilizes top-loading and …
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Adaptive beamforming of steerable array monopole antenna for WLAN application
… receiver. 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 …
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Latency Study and System Design Guidelines for Cooperative LTE-DSRC Vehicle-to-Everything (V2X) Communications including Smart Antenna
… improving performance is using a better suitable antenna for physical communication. The mobility of vehicles results in a highly variable propagation channel that complicates communication. Use of a smart, steerable antenna can be one solution. The most commonly used antennas for vehicular …
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Phased Array 802.11g Antenna
… involves the development of a 2.4GHz phased array antenna for consumer wireless applications. 802.11g specifications include 11 channels from 2.412 GHz to 2.472 GHz. Each channel has a 22MHz minimum bandwidth with a 5 MHz center-to-center interchannel spacing. Design goals for the phased …
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Single-band and Dual-band Beam Switching Systems and Offset-fed Beam Scanning Reflectarray
The reflectarray has been considered as a suitable candidate to replace the conventional parabolic reflectors because of its high-gain, low profile, and beam reconfiguration capability. Beam scanning capability and multi-band operation of the microstrip reflectarray have been main research topics …
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Design and Analysis of an Electronically Steerable Microstrip Patch and a Novel Coplanar Waveguide (CpW) Fed Slot Antenna Array
<p>Conformal Phased Array Antennas (CPAAs) are very attractive for their high gain, low profile, and beam scanning ability while being conformal to their mounting surface. Among them are microstrip patch phased arrays and wideband slot phased arrays which are of particular significance.</p> <p>In …
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Development And Characterization Of Beamforming Antenna Systems
… discusses the development of the beamforming antenna systems as a scaled model for customized RFID systems. In this work, an Fabry-Perot Cavity (FPC) antenna system consisting of a single source and frequency selective surface (FSS) is proposed (chapter 2) and investigated. Since the FPC …
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Spatial Coherency Estimation with a Synthetic Array
… such as Angles of Arrival (AOA). Synthetic Array (SA) processing synthesizes an array antenna by using a single moving antenna whose short-range trajectory can be estimated precisely by some complementary sensors, which enables the use of space-time processing to deal with the NLOS problem. …
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Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links
… with a wide beamwidth or a miniature phased array antenna that continuously scans to access the satellite(s). The array beam is controlled with a beam-forming network (BFN), which contains 3 or 4-bit phase shifters, which can be made in micro-electro-mechanical systems (MEMS) or in monolithic …
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Link Establishment in Ad Hoc Networks Using Smart Antennas
… been designed for nodes using omni directional antennas. Through the use of directional antennas, it is possible to obtain higher efficiency. In this thesis we investigate the impact of these antennas on aggregate throughput and end-to-end delay. The use of omni-directional antennas not only …
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