Browsing by Author "Muhammed, Juhar"

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    Design and Performance Analysis ofMicro strip patches Array Antennas for Long TermEvolution (LTE)
    (Addis Ababa University, 2017-03) Muhammed, Juhar; Abdo, Mohammed (Prof.)
    Micro strip patches antenna are playing an important role in wireless communication systems because of their many advantages like light weight, low profile, low cost, easy integration with planar structure and easy fabrication. So, it is verymuch essential to knowall the aspects of micro strip antennas. The main objective of this thesis is to discuss the design and performance issues of micro strip patch array antennas. The design issues include micro strip antenna dimensions, feeding techniques and various polarizationmechanisms whereas the performance issues include return loss, bandwidth issues directivity and radiation pattern of micro strip patch array antennas. In this thesis, a micro strip fed patches antenna array for long term evolution (LTE) application is designed using the MATLAB software. To design it, Standard formulas are used to calculate different parameters of the antenna. After design the array, some parameters are varied during simulation to get good performances.The proposed antenna is designed to work at 2.6GHz frequency band. A fractional bandwidth of 4.25%, which was not close to the desired 10% and a directivity of 4.66dB were attained single patch antenna. This may have been brought about by poor impedance matching and a high level of spurious feed radiation and surface waves. A way of improving the bandwidth, radiation pattern and minimize the return losswould have been expected for effective communication. To achieve this requirement we are designed (4x1) rectangular micro strip patch array antennas with micro strip line feeding based on quarter wave impedance matching technique using Mat lab software. The performance of the designed antenna is then compared with the single patch rectangle antenna in term of return loss, Voltage Standing Wave Ratio (VSWR), bandwidth, directivity, radiation pattern. After carried out computer simulation, rectangular micro strip patch array antenna offers the highest bandwidth efficiency of (as high as 12.5%), somewhat good directivity (9.66dB), minimum return loss (as low as -11.5dB) and has good radiation pattern. This is a fairly high though directivity increase and minimize loss could have been studied through use of different substrate material and thickness. The array antenna can be fabricate on the substrate type FR-4 with dielectric constant of 4.4 and thickness of 1.6mm respectively. Keywords: Rectangular Micro strips Array antenna, long term evolution (LTE), return loss and micro strip feed line.