Performance Comparison of Linearly and Circularly Polarized Micro strip Antenna for L-Band
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Date
2018-06
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Publisher
AAU
Abstract
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.
Description
Keywords
Micro strip antenna, Polarization, L-band, Return loss and Micro strip feed line