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Showing 1 to 12 of 12 for “"Electrically Small Antenna"”.
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Tunable electrically small antenna for next generation ionospheric heating
An efficient, metamaterial inspired electrically small antenna with the capability of frequency reconfiguration is evaluated for potential future use in Transportable Ionospheric Heating. Consisting of a Small Loop Antenna (SLA) inductively coupled to a Capacitively Loaded Loop (CLL) this design …
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Electrically-Small Antenna Performance Enhancement for Near-Field Detuning Environments
… 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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Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays
… of signals received from a single, nonstationary antenna. Next generation systems depended on phase measurements for direction-of-arrival information. With the advent of DSP-based direction fi nding, a return to amplitude-based measurements is possible. This enables direction-of-arrival estimation …
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Near-Field Focusing Phased Array for Hyperthermia Application
A conventional hyperthermia applicator is an electrically small antenna which produces a divergent beam. In this thesis, we propose a focused applicator made of phased arrays. The advantages of an array applicator are (i) smaller input power and less surface heating for achieving the same field …
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Development of an Electrically Small Vivaldi Antenna: The CReSIS Aerial Vivaldi (CAV-A)
… the CReSIS Meridian UAV requires a broadband antenna array composed of lightweight, thin, end-fire antenna elements. Toward this goal four Vivaldi antenna designs were simulated, fabricated, and characterized. The final design, dubbed the CReSIS Aerial Vivaldi - Revision A (CAV-A) provides …
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Moxon based RFID tag reader and GPS antenna
… applications at UHF frequencies require antennas with wide band, high forward gain, low backward radiation, high cross-polarization, small size and low manufacture cost. The Moxon antenna based on a two element Yagi-Uda antenna over the ground reflector is one of the most favorite …
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Time-varying Small Antennas for Wideband Applications
… to achieve a high-rate data transmission through electrically small antennas. However, the overall transmission bandwidth is limited by the antenna size. As a well-known physical limitation, maximum achievable bandwidth of a small antenna is governed by the fundamental limit which defines a lower …
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Design of Miniature Low-Cost Antennas for Compact Low-Data-Rate IoT Terminals
… Internet. Generally, an IoT node integrates an antenna, a radio transceiver, sensors/actuators, and an energy source. Among these components, the antenna remains a major obstacle in developing compact solutions, as its miniaturization significantly degrades its radiation efficiency and …
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Characteristic Modes for Impedance Matching and Broadbanding of Electrically Small Antennas
Antennas smaller than a quarter wavelength are fundamentally constrained in a variety of ways. One of the more problematic limitations is that the antenna's bandwidth declines sharply as the size of the antenna decreases. Myriad studies have sought antennas that perform close to the fundamental …
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Implanted Antennas and Intra-Body Propagation Channel for Wireless Body Area Network
… as frequency band selection, channel modeling, antenna design, physical layer (PHY) protocol design, medium access control (MAC) protocol design and power source. This research focuses on the design of implanted antennas, channel modeling between implanted devices and Wireless Power Transfer …
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Design and Analysis of Circularly Polarized Electrically Small Antennas
… In these applications, a miniaturized antenna is sometimes necessary for reducing overall size of the communication system. For many satellite based communication applications, circular polarization in antennas is needed for efficient communication. In this thesis, the miniaturization …
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Design and analysis of an electrically small inductively loaded sector antenna for frequency reconfiguration using varactor diodes
… demand, mobile devices have a multiplicity of antennas designed to work for specific bands. However, as mobile communication demands continue to grow, the number of antennas will become even more constrained by size and cost. In order to address this issue, an inductively loaded, electrically …