The demand for WiMAX technology isgoing to increase due to it significant characteristics of large bit rate withhigh speed and distance range in the field of telecommunications. In recentyears microstrip patch antennas have played a very important role in thetelecoms industry because of their unique characteristics of small size, lightweight low cost on mass production. They are easily etched on any PCB and willalso provide easy access for troubleshooting during design and development.They also have drawbacks as narrow bandwidth, low gain, small directivity andlow efficiency due to dielectric losses and conductor losses. In order toovercome the drawbacks a based metamaterial antennas are suitable for thisapplication.These antennas are made of engineeringmaterials designed to have properties that are not found in nature. Thesematerials(Metamaterials) are fabricated from assemblies of multiple elementsfashioned from composite materials such as; metal and plastic. They are usuallyarranged in repeating patterns at a scale that are smaller than the wavelengths of the phenomena they influence.
Their shapes, size, geometry,orientation and arrangement gives them their unique properties capable ofmanipulating electromagnetic waves. Since the introduction of this technique, alot of researchers were interested in investigating these artificial materials.In this work the goal is tominiaturize size of antenna dimension and improve bandwidth by comparingdimension and the parameter of the conventional microstrip patch antenna andantennas with square-shaped split ring metamaterial unit cells. Two rectangularmicrostrip patch antennas with square-shaped split ring metamaterial unit cellsare designed.
Antenna A consists of a double 5X5 square-shaped split ringmetamaterial and antenna B composed with a single 5X5 square-shaped split ringmetamaterial. The designed metamaterial unit cells are loaded on the groundplane. The presence of square-shaped split ring metamaterial unit cells in theproposed microstrip patch antennas are expected to improve the performance ofthe antennas, miniaturize antenna dimension, improve bandwidth than theconventional microstrip patch antenna and able to be applied in WiMAXtechnology.