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Showing 1 to 20 of 138 for “"Low-profile"”.
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Low Profile Integrated GPS and Cellular Antenna
… This paper presents a design for a compact, low-profile antenna that operates at both the conventional cellular telephone band of 824 to 894 MHz and the civilian GPS L1 frequency of 1575 MHz. The combined antenna unit has a lateral diameter of less than 4 inches (10 cm) and its height is less …
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Wideband Low-Profile Antenna Arrays: Fundamental Limits and Practical Implementations
… 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 applications. The …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
… proposed here will enable the design of a low profile and conformal single aperture supporting multi-band and multi-functional operations.
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Bandwidth enhancement techniques for low-profile antennas: Theory and experiment
… techniques for bandwidth enhancement for low-profile antennas. The first method involves the use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. …
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The static and fatigue behavior of low profile precast concrete sleepers
Low Profile precast concrete sleepers have the same vertical dimension as traditional wooden sleepers and thus offer a promising alternative to replace wooden sleepers on tracks where maintaining vertical alignment is necessary. The structural response of Low Profile precast concrete sleepers was …
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Low-Profile Magnetic Integration for High-Frequency Point-of-Load Converter
… The 3D integration concept is widely used for low current integrated POL. With this solution, a very low profile planar inductor is built as a substrate for the active components of the POL. By doing so, the POL footprint can be dramatically saved, and the available space is also fully …
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Analysis and design of compact low profile antennas for fixed volume applications
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-01-10T20:26:15Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 VanNiekerk_Carlo.pdf: 26003010 bytes, checksum: 915d921e86907a553b17985392559c1a (MD5)
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Investigation of Low Profile Antenna Designs for Use in Hand-Held Radios
… compact and unobtrusive. Electrically small and low-profile antennas experience high input reactance, low input resistance, and low radiation efficiency.Further degradation of radiation efficiency occurs in hand-held radios due to size-reduced ground planes, losses within the plastic device …
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Low Profile, Printed Circuit, Dual-Band, Dual-Polarized Antenna Elements and Arrays
… The multiple polarizations and frequency bands allow the array to generate multiple simultaneous beams to support true multifunction radar. Many of the applications in spaced-based systems and personal electronic devices have strict restraints on the size and weight of the antenna element, …
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Electrical, Thermal, and EMI Designs of High-Density, Low-Profile Power Supplies
… the analyses and designs of high-density, low-profile power supplies, including the electrical, thermal, and EMI aspects. Emphasis is placed on forward and flyback converters. The efficiency improvements of employing synchronous rectification are theoretically derived and experimentally …
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Modeling, analysis, and design of high-frequency high-density low-profile power transformers
… presents modeling and analysis techniques for low-profile transformers in power electronics. Based on the modeling and analysis, the design methodologies and design tools are provided. High frequency low-profile transformer 1-D winding loss, core loss and temperature rise models are derived in …
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Holocene Geology and Migration of a Low-Profile Barrier Island System, Metompkin Island, Virginia
… of historical shoreline position, cross-island profile change, and stratigraphic data provided a shoreline response model for low-profile barrier island systems. Historical shoreline data illustrates continuous, shore-parallel retreat between 1852 and 1957, at which time the island narrowed to a …
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Research and Development of Low-Profile, Small Footprint Antennas for VHF-UHF Range Applications
<p>Efficient, but low-profile and small-footprint antennas for VHF-UHF range applications remains an ongoing work. VHF range spans approximately 54 - 88 MHz while UHF roughly ranges from 174 - 890 MHz. The inverse relationship between the physical length and resonant frequency of an antenna, which …
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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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A Numerical Parametric Study on the Performance of a Low Profile dipole Planar Inverted Cone Antenna Placed over an Electromagnetic Bandgap Structure
… the conductive ground plane found in most low profile antennas. In this thesis, the effect of EBG materials on a low profile dipole planar inverted cone antenna (LPdiPICA) is investigated. A simple and effective design procedure for deriving the parameters for the Sievenepiper mushroom-like …
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A Comprehensive Investigation of New Planar Wideband Antennas
… Desirable features of a wideband antenna are low-profile, dual-polarization and wide bandwidth in a compact size. Many existing wideband antennas are large in size and some have only circular polarization. On the other hand low-profile, dual-polarized antennas frequently have limited …
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Ultra-wideband miniaturized microstrip patch antennas for wireless communications: design guidelines and modeling
… the meantime, creating a demand on efficient and low profile antennas which can be integrated on a printed circuit board. The main objective of this thesis is to study, design, analyze and implement UWB low profile microstrip patch antenna that satisfy UWB technology requirements. Some methods to …
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Design of an infrared multi-touch surface for use as a computer keyboard
… touch screen method while also maintaining a low profile. To ensure a low profile, the final design utilizes infrared phototransistors to detect and interpret incoming infrared light reflected off a user's finger in contact with the touch screen. The device proved it was capable of accurately …
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Electrically-Small Antenna Performance Enhancement for Near-Field Detuning Environments
Bandwidth enhancement of low-profile omnidirectional, electrically-small antennas has evolved from the design and construction of AM transmitter towers eighty years ago to current market demand for battery-powered personal communication devices. Electrically-small antenna theory developed with …
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Community Structure and Production of the Macrobenthos on Four Artificial Reefs in the Mississippi Sound in Relation to Substrate and Profile Type
… Two types of reef architecture used include high profile breakwater and low profile submerged structures. This study compared the benthic biota associated with oyster shell and cement rubble substrates among four artificial reefs representing high and low profile structures in summer 2011. …
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