Donut Shaped Ultra wideband Antenna for Cognitive Radio Application

Abstract

In the last few decades there have been significant use of Cognitive radio and UWB technologies. These technologies are used for efficient use of Spectrum for short range wireless communications. In 2002, FCC has released a wideband of 7.5 GHz (From 3.1GHz to 10.6GHz) as unlicensed to use it . UWB antennas proves to be a suitable candidate for spectrum sensing in cognitive radio and in UWB transceiver. Since antenna dimensions are frequency dependent, designing an antenna for wideband is a tough job. This paper discusses the gradual techniques to obtain ultra wide bandwidth (2.23GHz-11.4GHz) from narrowband patch antenna. Also the various antenna parameters of proposed antenna design and its simulated results are analysed.