size to the system. Slot loaded patch antennas have
than the narrow slot. Further, the study is carried out
attracted much attention in recent years due to their
for eight element array antenna.
capability of realizing various functionalities. For
S N Mulgi et al.19,20 in the year 2008 and 2009
example, a square patch antenna with a slot along the
proposed the wide band gap-coupled slot rectangular
diagonal direction can realize circular polarization
array and aperture coupled equilateral triangular
with a single feed7. Slots are also used to tune the
array, respectively. In both the cases, they have used
resonant frequencies of antennas8. Antenna size can
the aperture coupling technique, gap-coupling
be reduced by properly incorporating slots to make
technique and slot loading technique. They have
the electric current path mender9. U-slot patch
achieved the impedance bandwidth of 26.72 and
antennas10,11 and E-shaped patch antennas12 have
19.07%, respectively. The gain in both the cases was
recently been proposed to achieve a wide bandwidth
found to be negative (-10.38 and -7.37 dB). But the
with the help of slots.
proposed antenna uses single layer and achieved
As the slot loading technique is simple and
better results both in terms of impedance bandwidth
effective in enhancing the impedance bandwidth of
and gain. In 2005, Chakraborthy et al.21 have
microstrip antennas compared to other techniques
presented 4x4 rectangular aperture coupled microstrip