This letter presents the design and performance of T-slotted rectangular microstrip patch antenna (RMPA) with modified ground plane for the applications of WI-MAX and lower band of UWB communication system. The prototype of the proposed patch having dimensions 27 x 23 mm2 has been designed, fabricated and tested. The overall size of the antenna is 33mm × 33 mm × 1.59 mm. In addition to modifications of ground plane, the radiating patch is also modified in various steps by using CST Microwave Studio simulator 2014 and performance of antenna at various stages are obtained in free space. The proposed antenna effectively operates at two resonant frequencies and presents broad impedance bandwidth 2.32GHz or 72.27% with respect to central
frequency 3.21 GHz. Antenna also provides nearly flat gain in the desired frequency range with maximum gain 2.48dBi normal to patch structure and 2.99dBi in an inclined direction.
Microstrip antenna, Strip line feed, Broadband, Gain, Radiation patterns