In modern wireless application, wideband microstrip antenna plays a vital role. In this paper, we will discuss higher order mode dual beam ‘Microstrip Antenna’ instead of fundamental mode TM 01 to improve the bandwidth of the rectangular Microstrip antenna. Different techniques have been adopted to improve the bandwidth of planar antenna. A lot of work has been done using U-slot technique, here the antenna bandwidth is analyzed by combining single U, double U and triple U slots, with polygon slot on the radiating patch. This antenna operates between 5.1GHz to 7.1GHz having VSWR less than 2.15 and bandwidth increasing up to 33.3% with acceptable return loss response. This antenna exhibits two radiation beams directed at+40° and -40°. This proposed antenna is useful for indoor wireless applications such as cordless telephones, mobile communications, Wi-Fi etc.