Abstract: In this modern world, wireless communication has been developed rapidly and widely. The field of wireless communication is growing at a very fast rate covering different technical areas such as WLAN, Wi-MAX and Bluetooth. For wireless communication application efficient and small antennas are required. In this paper design of a compact size Microstrip line feed single slot dual band antenna is proposed. Microstrip antennas are suitable for Microwave and Millimetre wave Integrated Circuits (MMIC) and less expensive to fabricate using modern day printed board technologies. The antenna is composed of an octagonal slot on the bottom plane and one side of this octagon is modified into a half octagon. CST Microwave Studio is used for the simulation. The simulation results of the antenna shows that the designed antenna is capable of operating over the two bands 2260 MHz - 2580 GHz and 3970 - 6880 GHz. The dimension of the antenna is only 25 ? 25 ? 1.6 mm³. Moreover, antenna have nearly omnidirectional radiation pattern and 2.87 dB gain obtained in the second band of this antenna. The proposed Microstrip single slot antenna is suitable for operating Bluetooth, WiMAX (2.5/5.5 GHZ) and WLAN (2.4/5.2/5.8 GHz) applications.and experimental results, is presented to verify the feasibility and effectiveness of the projected study.

Keywords: Microstrip, Omnidirectional, Wi-MAX, WLAN.