The proposed antennas are rugged and have low cost and moderate gain suitable for RADAR, WLAN,
fixed satellite services, maritime mobile services and space applications covering 2 - 6 GHz frequency
range. The microstrip slot antennas are compact, having a size reduction of 21 %, 15% and 58 % with
the peak gain of 7.58 dB. The proposed antennas also resonate at two frequencies in S band. This dual
frequency behavior increases its applications in radar and satellite communications. The low
impedance bandwidth of the antenna is attributed to the low loss tangent of the FR4 substrate material
with higher gain.