Abstract— This paper presents the design of a multilayer
parasitic microstrip antenna array concerned on enhancement of
gain at 5.8 GHz for WiMAX application. The proposed structure
of this project is microstrip patch antenna array which is
composes of three layers using different material substrate. The
substrate for the first layer consists of Flame Retardant 4 (FR-4)
that has thickness 1.6mm while the second and third layers are
3mm thickness using foam substrate. The first layer is a driven
element while second and third layer are 2 by 2 parasitic patch
elements. The multilayer microstrip antenna array was design
and optimized using Computer Simulation Tool (CST). The
simulation results show the enhancement of gain is increased
about 62.3% when adding the parasitic element. The gain before
adding the parasitic element is 2.012 dB and after adding the
parasitic elements is 8.656 dB .The performance of the designed
antenna is to test for return loss, Voltage Standing Wave Ratio
(VSWR), bandwidth, directivity, radiation pattern and gain.