Minimization of Coupling Loss in Micro strip Antenna Arrays Using Defected Ground Structure & Frequency Selective Surface
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Date
2021-04
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Addis Ababa University
Abstract
The performance of microstrip antenna arrays is greatly undermined by the excitation of space
waves and surface waves which cause mutual coupling between microstrip antenna elements.
Mutual coupling between antenna elements can affect the side lobe levels, beam position and
frequency bandwidth of arrays. Mutual coupling through space waves are very strong if the array
elements are very close to each other, and they can be suppressed by increasing the interelement
spacing between the array elements. Defected ground structure (DGS) is a type of metamaterials
designed at ground that is used to minimize the surface wave and prevents the degrading in
performance of an antenna. Frequency Selective Surface (FSS) is also useful in miniaturization
of a designed antenna.
In this thesis work, a ground plane is loaded with defected ground structure and frequency
selective surface techniques to minimize the effect of coupling loss and to enhance the
performance of the MSPA.
A rectangular-aperture coupled microstrip patch antenna is first designed for S-band application
and 2x1 MSPA antenna array is formed by using the optimized design of the individual antenna
for an inter element spacing l/4 (where l is the operating wave length of the antenna which is
equal to 130.43mm). Then a simulation is carried out to measure the S11, S12, and other
parameters of the antenna. Finally, DGS &FSS are applied on the antenna and the reduction in
coupling loss is analyzed using HFSS Software.
The result of the study indicates, 2X1 rectangular micro strip patch antenna array inserting FSS
at the ground plane were proposed for 2.3GHz which has an improved bandwidth of
71.8MHzand mutual coupling effect is -35.668dB when compared with an antenna array with
DGS.
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Keywords
Micro-Strip Antenna (MSA), Defected Ground Structure (DGS), Frequency Selective Surface (FSS)