UWB MIMO ANTENNA THESIS

The single, dual and wide band isolation enhancements are realized through the half-wavelength decoupling slot, quarter-wavelength decoupling slot with T-shaped impedance transformer, tree-like parasitic element with multiple resonances, as well as the different polarizations and radiation patterns of multiple antennas. Thus, Antennas are typically placed apart from others at least half wavelength of the lowest operating frequency, and this could lead to increase in dimensions of MIMO antenna. With the inter-element distance larger than a certain distance, a higher Q factor also improved the total efficiency apart from the low correlation. The effectiveness of the tree-like structure is analyzed. The proposed antenna is based on the concept of dual polarization.

Utilizing these usefully information, an adaptive quad-element MAS has been proposed to reduce the user effects and the some geranial rules not limited to the designed MAS have also been given. The effectiveness of the tree-like structure is analyzed. The decoupling techniques are investigated in the multiple antenna systems operating at the higher frequencies above 1. In Communication systems, Multiple Input—Multiple Output MIMO technology, which involves the use of multiple antennas at both the transmitter and receiver, is used to significantly enhance the data transmission performance and channel capacity. UWB antennas are designed and analyzed using microstrip feeding technique and coaxial feed to achieve low profile and compatibility with Printed Circuit Board. However, due to the limited space of small mobile devices, the correlation coefficients between MIMO antenna elements are very high and the total efficiencies of MIMO elements degrade severely.

The simulated and measured results are in good agreement which demonstrate its potential use in UWB portable devices. Furthermore, the human body causes high losses on electromagnetic wave. The wideband isolation can be achieved through a tree-like structure on the ground plane.

The effectiveness of the tree-like usb is analyzed.

Krishikosh: Design and Analysis of Ultra Wide Band MIMO Antennas for Wireless Communications

Thus, Antennas are typically placed apart from others at least half wavelength of the lowest operating frequency, and this could lead to increase in dimensions of MIMO antenna.

The high isolation among the antenna elements is a basic requirement for good diversity performance. There are many challenges tuesis this field, one of the challenge is to design an antenna which covers the entire UWB frequency range, the another challenge is to design an UWB Multiple input-Multiple output antenna which will increase the channel capacity and will allow several users to access the various services at the same time.

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A new mode of mutual scattering mode is introduced.

uwb mimo antenna thesis

Several figures of merits are provided and discussed to evaluate the multiple antenna systems. The user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes. Also, Different techniques for obtaining a bandstop function in the 5 to 6 GHz frequency band to avoid interference with other existing worldwide interportability for microwave access WIMAX systems are numerically and experimentally presented.

Ultrawideband MIMO/Diversity Antennas With a Tree-Like Structure to Enhance Wideband Isolation

The radiator is shared between two antenna elements. The radiation patterns, gain, and envelope correlation coefficient are also measured.

uwb mimo antenna thesis

During the applications, the presence of users may result in the significant reduction of the antenna total efficiencies and highly affects the correlations of MIMO antenna systems.

The single, dual and wide band isolation enhancements are realized through the half-wavelength decoupling slot, quarter-wavelength decoupling slot with T-shaped impedance transformer, tree-like parasitic element with multiple resonances, as well as the different polarizations and radiation patterns of multiple antennas. The antenna consists of two tapered Co-planer Waveguide CPW feeds printed on one side of the substrate and a circular shared radiator on the other side.

UWB antennas are designed and analyzed using microstrip feeding technique and coaxial feed to achieve low profile and compatibility with Printed Circuit Board.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. In the lower bands lower than MHzdue to the low radiation efficiency and strong chassis mode, the work mainly focused on how to directly reduce the correlations and enlarge the total efficiency.

Please use this identifier to cite or link to this item: Antennas for this system are designed, to ensure that isolation between elements should be less than – 15 dB. The high Q factors required for the low correlation and high efficiencies in mutual scattering mode is reduced with another mode of diagonal antenna-chassis mode. Utilizing these usefully information, an adaptive quad-element MAS has been proposed to reduce the user effects and the some geranial rules not limited to the designed MAS have also been given.

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Show full item record. The proposed antenna is based on the concept of dual polarization.

By increasing the Q factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations. Today, owners of small communicating device are interested in transmitting or receiving various multimedia data. Thhesis the inter-element distance larger than a certain distance, a higher Q factor also improved the total efficiency apart from the low correlation. The thesis starts with designing and implementing UWB antennas with discussions ajtenna their operation, electrical behavior and performance.

The background and theory of multiple antenna systems are introduced briefly first. It has single common circular radiator for both the antenna elements.

KrishiKosh (कृषिकोश)

However, due to the limited space of small mobile devices, the correlation coefficients between MIMO antenna elements are very high and the total efficiencies of MIMO elements degrade severely. In Communication systems, Multiple Input—Multiple Output MIMO technology, which involves the use of multiple antennas at both antnna transmitter and receiver, is used to significantly enhance the data transmission performance and channel capacity.

The objective of this thesis is to design UWB antennas that operates in the frequency range from 3. Therefore, miniaturizing the antenna size and improving the isolation coefficients are the two most important aims for MIMO antennas.

The decoupling techniques are investigated in the multiple antenna systems operating at the higher frequencies above 1.