The cell is shown in figure (2).

The demand for WIMAX technology is
going to increase due to it significant characteristics of large bit rate with
high speed and distance range in the field of telecommunications. In recent
years microstrip patch antennas have played a very important role in the
telecoms industry because of their unique characteristics of small size, light
weight low cost on mass production. They are easily etched on any PCB and will
also provide easy access for troubleshooting during design and development.
They also have drawbacks as narrow bandwidth, low gain, small directivity and
low efficiency due to dielectric losses and conductor losses. In order to
overcome the drawbacks a based metamaterial antennas are suitable for this
application.

These antennas are made of engineering
materials designed to have properties that are not found in nature. These metamatrial
antennas are easy to fabricate and has small dimension. A square – shaped split
ring resonator unit cell is shown in figure (2).
Their shapes, size, geometry,
orientation and arrangement gives them their unique properties capable of
manipulating electromagnetic waves.
The unit cells are formed to replace
the SRR in other to produce negative permeability and  LH ( left handed).Complementary split Ring
Resonators generate an electric field from the flow of current through the
transmission line. These materials(Metamaterials) are fabricated from
assemblies of multiple elements fashioned from composite materials such as;
metal and plastic. They are usually arranged in repeating patterns at a scale
that are smaller than the wave lengths of the phenomena they influence. Since
the introduction of this technique, a lot of researchers were interested in
investigating these artificial materials.

In this work the goal is to
miniaturize size of antenna dimension and improve bandwidth. By comparing
dimension and the parameters of the conventional microstrip patch antenna and
antennas with square-shaped split ring metamaterial unit cells. Two rectangular
microstrip patch antennas with square-shaped split ring metamaterial unit cells
are designed. Antenna A consists of a double 5X5 square-shaped split ring
metamaterial and antenna B composed with a single 5X5 square-shaped split ring
metamaterial. The designed metamaterial unit cells are loaded on the ground
plane. The presence of square-shaped split ring metamaterial unit cells in the
proposed microstrip patch antennas are expected to improve the performance of
the antennas, miniaturize antenna dimension, improve bandwidth than the
conventional microstrip patch antenna and able to be applied in WIMAX
technology.