UWB MIMO ANTENNA THESIS

Therefore, miniaturizing the antenna size and improving the isolation coefficients are the two most important aims for MIMO 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. The objective of this thesis is to design UWB antennas that operates in the frequency range from 3. 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. The high isolation among the antenna elements is a basic requirement for good diversity performance.

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. Antennas for this system are designed, to ensure that isolation between elements should be less than – 15 dB. 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. By increasing the Q factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations. The simulated and measured results are in good agreement which demonstrate its potential use in UWB portable devices. It has single common circular radiator for both the antenna elements. 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.

In Communication systems, Multiple Input—Multiple Output MIMO technology, which involves the use of multiple antennas at both the transmitter and thesks, is used to significantly enhance the data transmission performance and channel capacity.

uwb mimo antenna thesis

The radiation patterns, gain, and envelope correlation coefficient are also measured. 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.

Therefore, miniaturizing the antenna size and improving the isolation coefficients are the two most important aims for MIMO abtenna. The high isolation among the antenna elements is a basic requirement for good diversity performance. Please use this identifier to cite or link to this item: Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. 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, uwbb parasitic element with multiple resonances, as well as the different polarizations and radiation patterns of multiple antennas.

  USASK THESIS DEFENSE

The radiator is shared between two antenna elements.

With the inter-element distance larger than a certain distance, a higher Q factor also improved the total efficiency apart from the low correlation. Show full item record. Thesus 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.

A new mode of mutual scattering mode is introduced. 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 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 mimo antenna thesis

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 uqb presented.

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.

KrishiKosh (कृषिकोश)

The effectiveness of the tree-like structure is analyzed. The objective of this thesis is to design UWB antennas that operates in the frequency range from 3.

The simulated and measured results are in good agreement which demonstrate its potential use in UWB portable devices. The wideband isolation can be achieved through a tree-like structure on the ground plane.

uwb mimo antenna thesis

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

  AUTOBIOGRAPHICAL ESSAY FOR MBA UITM

UWB antennas are designed and analyzed using microstrip feeding technique and coaxial feed to achieve low profile and compatibility with Printed Circuit Board. Antennas for this system are designed, to ensure that isolation between elements should be less than – 15 dB.

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

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

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.

By increasing the Aantenna factors, the radiation patterns of multiple antennas are separated automatically to reduce the correlations. Furthermore, the human body causes high losses on electromagnetic wave.

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

It has single common circular radiator for both the antenna elements. 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 thesis starts with designing and implementing UWB antennas with discussions covering their operation, electrical behavior and performance.

Utilizing these usefully information, an adaptive quad-element MAS has been proposed to reduce the user effects and the thseis geranial rules not limited to the designed MAS have also been given.

The decoupling techniques are investigated in the multiple antenna systems operating at the higher frequencies above 1. The proposed antenna htesis based on the concept of dual polarization.

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