Performance Comparison of Linearly and Circularly Polarized Micro strip Antenna for L-Band

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In recent years, the devices in communication systems require the development of low cost, minimal weight, compact and low profile antennas that are capable of maintaining high performance over a wide spectrum of frequencies. This technological development has focused much effort in the design of micro strip patch antennas because of its inherent characteristics that fits the requirements of modern communication devices. This thesis presents the performance of linearly and circularly polarized micro strip antenna for L-band at 1.575GHz frequency operation and using the inset feed technique. The simulation of the design was done with the aid of computer simulation technology (CST) studio version 16 software and matlabR2015a which will be used to calculate the parameters. To design it, standard formulas are used to calculate different parameters of the antenna. After design the antenna, some parameters are varied during simulation to get good performances. The analysis for return loss, gain, directivity and radiation pattern were carried out. The proposed antenna shows return loss -14.692dB for right hand circular polarization (RHCP), -10.02dB for left hand circular polarization (LHCP) and -3.64dB for horizontal polarization (LP) and -21.41dB for vertical polarization which implies good result. The impedance matching is good at desired frequency with VSWR < 2 respectively. Another parameters which used to evaluate the performance of an antenna for different polarization are gain, directivity and bandwidth efficiency. In terms of these parameters one can compare the performance. Simulation results show that, right hand circularly polarized micro strip antenna offers high directivity (6.49dB) and high gain ( as high as 5.22dB), minimum return loss and moderate bandwidth efficiency and has more suitable voltage standing wave ratio. This is a fairly high through directivity increase and minimize loss could have been studied through use of different substrate material and thickness. Therefore, RHCP are more preferable for selected application /system. The antenna can be designed on the substrate type RT/Doruid 6006 with dielectric constant of 6.15 and thickness of 1.6mm.



Micro strip antenna, Polarization, L-band, Return loss and Micro strip feed line