Abstract: A circular ring slot antenna (CRSA) with microstrip feeding technique is analysed at 2.45 GHz frequency. In order to suppress additional harmonics produced by the ring slot pattern in wide range nearly 3 to 8 GHz, a defected ground structure (DGS) is integrated into the CSRA. The proposed antenna is analysed and simulated mainly for the wireless sensor network applications. This antenna is simulated by the High Frequency Structure Simulator (HFSS). Analysing the proposed antenna and simulated results on return loss, radiation pattern and gain.

Keywords: Circular Ring slot Antenna (CRSA), Defected ground structure (DGS), High Frequency Structure Simulator (HFSS) v 14, harmonic suppression.