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 22 for “"Small antenna"”.
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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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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
… 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 well-known …
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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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THz Cryo-CMOS Link for Quantum Computing
… environment. Its operation allows for a small antenna aperture size, high data rate, and minimal interference with the operation of the qubits.
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Anomalous Nature Of Metamaterial Inclusion and Compact Metamaterial-Inspired Antennas Model For Wireless Communication Systems. A Study of Anomalous Comportment of Small Metamaterial Inclusions and their Effects when Placed in the Vicinity of Antennas, and Investigation of Different Aspects of Metamaterial-Inspired Small Antenna Models
… of this thesis is to investigate and design smaller and wideband metamaterial-inspired antennas for personal communication applications, especially for WiMAX, lower band and higher band WLAN applications. These antennas have been simulated using HFSS Structure Simulator and CST Microwave …
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Near-Field Focusing Phased Array for Hyperthermia Application
… 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 intensity …
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Time-varying Small Antennas for Wideband Applications
… 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 bound on the …
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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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Rock differentiation using microwave irradiation
… placed between a transmitting and a receiving antenna. Equipment was designed and constructed with an operating frequency of 35GHz chosen due to the small antenna aperture area and the large attenuation difference at this frequency. Static measurements with this equipment revealed the problems …
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Time-Variant Components to Improve Bandwidth and Noise Performance of Antennas
… Thus, the design of low-noise devices (such as antennas, amplifiers, and filters) is essential to increase the communication range. Also, it is well known that the noise performance of a receiving radio is primarily determined by the frontend including the antenna, filter, and a low-noise …
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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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Exploring the Sensing Capability of Wireless Signals
… radios with sub-meter accuracy with as few antennas as possible. With a small antenna array, the cost, complexity as well as size of this device are reduced. MobTrack is the first single device indoor interference localization system without the requirement of multiple pre-deployed access …
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Wideband Compact Antennas for Wireless Communication Applications
… communication devices to become physically smaller in size. Antenna size is obviously a major factor that limits miniaturization. In the past few years, new designs of low-profile antennas for handheld wireless devices have been developed. The major drawback of many low-profile antenna …
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Antennas for Terahertz Applications: Focal Plane Arrays and On-chip Non-contact Measurement Probes
… and much lower photon energies, highly efficient antennas with optimized input impedance have to be integrated with THz sensors. Here, we implement novel antenna engineering techniques that are optimized to take advantage of recent technological advances in solid-state THz sensing devices. For …
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Source localization via time difference of arrival
… at low signal-to-noise ratio (SNR). Employing a small antenna array at each sensor is shown to lower the sidelobes level in the localization metric. Finally, the performance of time delay and amplitude estimation from samples of the received signal taken at rates lower than the conventional …
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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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