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 119 for “"Ground Plane"”.
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Reconfigurable reflectarray with a flexible ground plane
To view abstract please refer to PDF.
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Impedance effects of metallic ground plane on the CTHA antenna
… of the distance between it and the metallic ground plane. For equivalent distances between the antenna and the metallic ground plane, the CTHA's impedance has been shown to be less affected than the impedance of a vertical dipole, a horizontal dipole, or a horizontal loop antenna. This has …
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Ground Plane Slot Structures for Isolation of Cosited Microstrip Antennas
Ground plane slot structures have been shown to reduce coupling between cosited antennas. Although some such structures have already been reported, no analytical model exists to describe their behavior and there are no design guidelines. In this work, the behavior of reported ground plane …
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Redeveloping modern housing sites : improving the livability of the ground plane
… suffered from safety concerns and isolation. The ground planes of Corbusier inspired plans were disconnected from the public. Over time advocates of traditional city form have pushed new ideas to the forefront of urban design to facilitate a pedestrian-friendly environment, such as new urbanism …
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Method of Moments Analysis of an Aperture in a Thick Ground Plane
… is in a thick infinite perfectly conducting ground plane. The conducting walls of the cavity inside the ground plane are of arbitrary shape. The apertures at both ends of the cavity are also of arbitrary shape. The structure is illuminated by an incident plane electromagnetic wave. The …
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Electromagnetic wave scattering by surface discontinuities in a perfectly conducting ground plane
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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An Investigation on the Effect of Ground Plane Roughness on Antenna Radiation Characteristics
… of a thin-wire monopole antenna over both a flat ground plane and a randomly-varying rough surface. The Method of Moments with the Electric Field Integral Equation (EFIE) is used to account for all coupling interactions. Monte Carlo averaging is used to compute results over multiple rough surface …
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A computational study of a lifting wing in close proximity to a moving ground plane
… of a DHMTU lifting wing flying in ground effect. In particular, the performance of the wing in the presence of waves was of interest. But first a reliable computational model had to be developed to simulate waves flowing past the wing. Therefore the objective of this study was to …
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An experimental study of the aerodynamic characteristics of a wing in close proximity to a moving ground plane
… was conducted to determine the effect of ground proximity on the aerodynamic characteristics of a slender un-cambered DHM1TU rectangular wing of aspect ratio 3. A moving-belt ground plane and elevated aerodynamic balance facility were designed and installed in the UCT McMillan Laboratory …
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Impact of ground plane serrations on radiation and impedance characteristics of a slot antenna over a conductive back plane
… is placed by shielding it with a conductive back plane. Slot antennas and planar dipole antennas are common choices for thin, placement-insensitive designs. They can be manufactured in a very economical fashion because both feed connections are on the same plane. However, when the conductive back …
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An analysis of the bandwidth oscillations caused by finite ground planes using characteristic mode theory
… antennas (PIFAs) changes as the rectangular ground plane changes length. Although previous research has characterized these changes, it has failed to adequately explain why the bandwidth and pattern changes occur. This thesis explains why these changes in bandwidth and radiation occur by …
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Single-layer transport measurements of bilayer 2D electron and hole systems in GaAs heterostructures
… we present a technique for using a nearby ground plane to screen the long-range Coulomb interactions in a 2D hole system (2DHS). Using a bilayer 2DHS, we are able to vary the distance from the ground plane to the 2DHS between 50 and 340nm, in the same sample without thermal cycling. This …
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Classification and modeling of forested terrain using LIDAR sensing
To operate autonomously, unmanned ground vehicles (UGVs) must be able to identify the load-bearing surface of the terrain (i.e. the ground) and obstacles. Current sensing techniques work well for structured environments such as urban areas, where the roads and obstacles are usually highly …
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Microjet based noise control of supersonic jets on carrier decks
The effectiveness of ground plane water microjet control on the noise generated by a supersonic, ideally expanded, Mach 1.5, impinging jet was determined. Using a converging-diverging nozzle with a design Mach number of 1.5, the jet was operated at temperatures ranging from 60 to 1700°F. Six …
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An Investigation of Dual-Band Fabry-Pérot Resonant Cavity Antennas
… selective surface (FSS) patch layer over a ground plane to form a composite artificial ground plane that replaces the single metal ground plane of the conventional structure. The structure thus consists of an upper cavity region (between the FSS and the partially reflective surface, also …
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An embedded IoT antenna for smart pavement monitoring system
… patch antennas used in road pavement, a ground plane serration technique has been studied and applied to the proposed antenna to improve its performance. Simulation and measurement results show that with serrations on the ground plane, the proposed antenna is able provide broadside gain …
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Reduction Of Mutual Coupling In Antenna Technology Using Elliptically Shaped Metasurfaces
… the bandwidth of wire monopole antennas over a ground plane. This was then moved to an elliptical structure, using a strip monopole antenna. The last structure explored was for a microstrip antenna, where the strip monopole antenna is now placed above a ground plane on a substrate.
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Development of wideband phased array antenna
… one element and meander line T-divider, partial ground plane and two slots at ground plane. The antenna was designed and optimized using CST Microwave studio (CSTMWS). The proposed antenna‟s parameters were optimized with various options such as differing the ground plane length, different slot …
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Development of triple band planar inverted F-antenna (PIFA) for GSM 800 MHz, DCS 1800 MHz and Bluetooth 2400 MHz
… plate is employed between the top patch and the ground plane. The antenna is fed by using coaxial feeding as it is easier to design. The antenna is designed and simulated using CST Microwave Studio. Different parameters such as shorting width, height of antenna, ground plane size and patch slot …
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Modal analysis of radiation and energy storage mechanisms on conducting scatterers
… the energy storage modal expansions. The role of ground plane radiation on the determination of an embedded antenna's Q factor is studied using radiation modes, giving a new perspective on the convergence behavior of this parameter with respect to ground plane size. Leveraging the invariance of …
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