1 Introduction
available in the literature, an effort is made to enhance
Microstrip antennas are increasingly finding
the impedance bandwidth of rectangular microstrip
applications in microwave communication systems as
array antenna by using slot loading technique.
they are light weight, have planar configuration and
In this proposed study, a four element rectangular
inexpensive to fabricate. The most serious limitation
microstrip array antenna (4RMSAA) (ref. 13) is
is the narrower impedance bandwidth that resonates at
modified to plus shape array by embedding wide slots
a single frequency. Various techniques are available
at the edges of each element14-18, which results in the
for broadening the impedance bandwidth1-6.
improvement of antenna parameters. These slots are
A slot antenna is of major importance because of
considered as wide slots as their width is comparable
its simple structure. When a microstrip slot antenna is
to their length. The wide slot is selected because it is
fed using a microstrip line it does not add weight and
more effective in enhancing the impedance bandwidth