Bandwidth is the primary resource of any communication system, as the radio spectrum is fixed. The high gain and directivity is also the major issue for a wireless network. Microstrip antenna has popular attractive features such as low profile, low cost, small size and easily integrated with RF devices; but has narrow bandwidth and low gain. This paper comprises one novel technique in order to increase the bandwidth, gain and directivity of the conventional rectangular patch antenna. In this paper gain, directivity and bandwidth of a conventional patch antenna is enhanced by increasing dielectric layer between the patch and ground through silicon micromachining technique. In Radio Frequency Identification (RFID) technology, these types of antenna provide superior performance and all the simulation has been carried out in high frequency structure simulator (HFSS).