UWB MIMO ANTENNA THESIS

Furthermore, the human body causes high losses on electromagnetic wave. The proposed antenna is based on the concept of dual polarization. The user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes. 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. 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. 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. It has single common circular radiator for both the antenna elements. 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. Several figures of merits are provided and discussed to evaluate the multiple antenna systems.

In the lower bands lower than MHz uqb, 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 thesis starts with designing and implementing UWB antennas with discussions covering their operation, electrical behavior and performance. The background and theory of multiple antenna systems are introduced briefly first. 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 radiation patterns, gain, and envelope correlation coefficient are also measured.

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 wideband isolation can be achieved through a tree-like structure on the ground plane. Items in DSpace are protected by copyright, with all rights reserved, unless ywb indicated.

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uwb mimo antenna thesis

Thus, Antennas are typically placed apart from others thesie least half wavelength of the lowest operating frequency, and this could lead to increase in dimensions of MIMO antenna. The effectiveness of the tree-like structure is analyzed. The user effects are studied in different MIMO antenna types, chassis lengths, frequencies, port phases and operating modes.

The proposed antenna is based on the concept of dual polarization. It has single common circular radiator for both the antenna elements. With the inter-element distance larger than a certain distance, a higher Q factor also improved angenna total efficiency apart from the low correlation. Also, Different techniques for obtaining a bandstop function in the 5 to 6 GHz mimk band to avoid interference with other existing worldwide interportability for microwave access WIMAX systems are numerically and experimentally presented.

uwb mimo antenna thesis

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.

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. Please use this identifier to cite or link to this item: Furthermore, the human body causes high losses on electromagnetic wave.

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.

A new mode of mutual scattering mode is introduced. Therefore, miniaturizing the antenna size and improving the isolation coefficients are the two most important aims for MIMO antennas.

KrishiKosh (कृषिकोश)

The decoupling techniques are investigated in the multiple antenna iwb operating at the higher frequencies above 1. Show full item record. 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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By increasing the Q factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations.

The objective of this thesis is to design UWB antennas that operates in the frequency range from 3. Today, owners of miimo communicating device are interested in transmitting or receiving various multimedia data.

The radiator is shared between two antenna elements. Several figures of merits are provided and discussed to evaluate the multiple antenna systems. Antennas for this system are designed, to ensure that isolation between elements should be less than – 15 dB. The high isolation among the antenna elements is a basic requirement for good diversity performance.

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

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 anfenna the channel capacity and will allow several users to access the various services at the same time.

The simulated and measured results are in good agreement which demonstrate its potential use in UWB portable devices. UWB antennas are designed and analyzed using microstrip feeding technique and coaxial feed to achieve low profile and compatibility with Printed Circuit Board. The high Q factors required for the atnenna correlation and high efficiencies in mutual scattering mode is reduced with another mode of diagonal antenna-chassis mode.