الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Modern radio communication systems have to provide higher and higher data rates. As conventional methods like using more bandwidth or higher order modulation types are limited. Also, recent technologies enable electronic and RF circuits in wireless communication devices to be miniaturized and become physically smaller in size. Antenna design has been one of the key limiting constraints to the development of small communication terminals and also in meeting next generation wireless communication requirements. Multiple-Input-Multiple-Output (MIMO) technology is one of the major advances in (4G) wireless standards that led to the large increase in the data rates and throughput via the use of multiple antennas on the receiver and transmitter sides. Multiple Antenna Technologies (MATs) have gained much attention in the last few years because of the huge gain. MATs can enhance the communication reliability and the channel capacity levels. Furthermore, multiple antenna systems can have a big contribution to reduce the interference in both the uplink and the downlink. To increase the communication systems reliability, multiple antennas can be installed at the transmitter or/and at the receiver. The design of MIMO antennas is a challenging area which is the designer needs to design single or multiple antenna systems that are covering different bands. Such issues deal with the mutual coupling, the field correlation among others. In modern communication transceiver system, primary aims are to direct high power RF signal from transmitter to antenna while preventing leakage of that large signal into more sensitive front-end of receiver. So, a Single-Pole Double-Throw (SPDT) Transmitter/Receiver (T/R) switch plays an important role. The two-way power splitter is attained using Wilkinson type power divider, which improves the isolation and matching of the ports. All the entire proposed antenna systems have been designed and evaluated using commercial software, High Frequency Structure Simulator (HFSS), to demonstrate the proposed antenna systems excellence performance and meet the requirements for wireless communication applications fabricated and the radiation characteristics have been illustrated. The measured S-parameters of the proposed structure can be analyzed with network analyzer and compared with simulation results to demonstrate the proposed antenna system performance to meet the requirements for MIMO antenna system applications. Second,the Single-Input-Multiple-Output (SIMO) systems are acceptable in many applications but where the receiving system is located in the mobile device. So, the distributed subarray SIMO (DS-SIMO) microstrip antenna system with SPDT-T/R switch has been introduced, designed and analyzed. The final proposed design has been fabricated and the radiation characteristics have been illustrated. The simulated and experimental results of the proposed structure are presented to demonstrate the performance and meet the requirements for consumer receiving diversity applications.In this thesis, first, the analysis and design of microstrip array antenna using SPDT-T/R switch has been introduced and investigated. The proposed design has beenand the radiation characteristics have been illustrated. The measured Sparameters
of the proposed structure can be analyzed with network analyzer and
compared with simulation results to demonstrate the proposed antenna system
performance to meet the requirements for MIMO antenna system applications. Second,
the Single-Input-Multiple-Output (SIMO) systems are acceptable in many applications
but where the receiving system is located in the mobile device. So, the distributed
subarray SIMO (DS-SIMO) microstrip antenna system with SPDT-T/R switch has
been introduced, designed and analyzed. The final proposed design has been fabricated
and the radiation characteristics have been illustrated. The simulated and experimental
results of the proposed structure are presented to demonstrate the performance and
meet the requirements for consumer receiving diversity applications.
Finally, the wireless communication has evolved from 2G to 5G , long term
evolution (LTE) and the companies are fighting to create networks with more and more
capacity so that data rates can be increased and customers can be benefitted more. The
ultimate goal of wireless communication systems is to create a global personal and
multimedia communication without any capacity issues. The design of smart
distributed subarray MIMO (DS-MIMO) microstrip antenna system with controller
unit and frequency agile has been designed, integrated and fabricated using Printed
Circuit Board (PCB). All the sub-circuits and the entire system have been evaluated.
This system integration technique provides not only low cost but also high
performance because of the elimination of parasitic associated with lumped
components in a conventional design. The present work, in this thesis, shows the
possibilities of designing flexible DS-MIMO integrated antenna system for wireless
communication applications.