UWB MIMO ANTENNA THESIS

In the lower bands lower than MHz , due 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. The proposed antenna is based on the concept of dual polarization. Furthermore, the human body causes high losses on electromagnetic wave. The effectiveness of the tree-like structure is analyzed. 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 user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes. UWB antennas are designed and analyzed using microstrip feeding technique and coaxial feed to achieve low profile and compatibility with Printed Circuit Board. The background and theory of multiple antenna systems are introduced briefly first. The radiation patterns, gain, and envelope correlation coefficient are also measured. The radiator is shared between two antenna elements.

The user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes. The objective of this thesis is to design UWB antennas that operates in the frequency range from 3. The radiation patterns, gain, and envelope correlation coefficient are also measured. The effectiveness of the tree-like structure is analyzed. In the lower bands lower than MHzdue to tnesis low radiation efficiency and strong chassis mode, the work mainly focused on how to directly reduce the correlations and enlarge the total efficiency.

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. The wideband isolation can be achieved through a tree-like structure on the ground plane.

Therefore, miniaturizing the antenna size and improving the isolation coefficients are the two most important aims for MIMO antennas. By increasing the Q factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations. 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.

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The proposed antenna is based on the concept of dual polarization. The background and theory of multiple antenna systems are introduced briefly first. The antennna is shared between two antenna elements.

The simulated and measured results are in good agreement iwb demonstrate its potential use in UWB portable devices. The thesis starts with designing and implementing UWB antennas with discussions covering their operation, electrical behavior and performance.

Several figures of merits are provided and discussed to evaluate the multiple antenna systems.

KrishiKosh (कृषिकोश)

Today, owners of small communicating device are interested in transmitting or receiving various multimedia data. 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.

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. Furthermore, the human body causes high losses on electromagnetic wave. In Communication systems, Multiple Input—Multiple Output MIMO technology, antenns involves antenan use of multiple antennas at both the transmitter and antrnna, is used to significantly enhance the data transmission performance and channel capacity.

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. A new mode of mutual scattering mode is introduced.

uwb mimo antenna thesis

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.

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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. However, due to the tjesis space of small mobile devices, the correlation coefficients between MIMO antenna elements are very high and the total efficiencies of MIMO elements degrade severely.

uwb mimo antenna thesis

It has single common circular radiator for both the antenna elements. Show full item record. Antennas for this system are designed, to ensure that isolation between elements should be less than – 15 dB. 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.

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

Please use this identifier to cite or link to this item: With the inter-element distance larger than a certain distance, a higher Q factor also improved the total efficiency apart from the udb correlation. The decoupling techniques are investigated in the multiple antenna systems operating at the higher frequencies above 1. There are many challenges in 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 anfenna and will allow several users to access the various services at the same time.