Moon slotted circular planar monopole UWB antenna design and analysis

Design and analysis of a moon slotted circular planar monopole UWB (ultra-wide band) antenna is discussed. The proposed antenna operates within a frequency spectrum of 2.62GHz to 12.63GHz, which includes the unlicensed band 3.1GHz-10.6GHz approved by FCC in 2002. It achieves a maximal peak gain of 4.85dBi at 9.75GHz and highest radiation efficiency of 95.94% at 3.1GHz. This antenna is mounted on a FR 4 substrate having dimensions 30mm×19mm×1.6mm. This paper initially reports a systematic way of conventional circular planar monopole UWB antenna design and then presents a step-by-step design process to obtain the proposed UWB antenna from the conventional one. In this process transmission line equivalent models for different design steps are also discussed. These models are basically derived from the conventional assumption of copper elements interms of R, L and C. Then after, it reports a comparison study of the two UWB antennas. Finally, the proposed UWB antenna geometry is fabricated and tested. Experimental result shows an agreement with the simulated result.