Reconfigurable multi band notches antenna for cognitive radio applications

In this paper, a reconfigurable multi band notches antenna, for cognitive radio applications, is proposed. The antenna can be operated as ultra wideband, and is reconfigurable in terms of the ability to select one or two notches band in the SRR resonant frequency. The Reconfigurable band notches are induced using a band stop filter based on split-ring resonators (SRRs), and are controlled using two couple of ideal switches mounted over the SRRs. For this sake, the design of band stop filter is proposed. A prototype of filter is fabricated and measured. The incorporation of a band stop filter, into a wideband antenna, is then looked into. The proposed antenna is designed and simulated using Ansoft HFSS. A prototype of the antenna is fabricated and measured. A good analogy between simulated and measured results is obtained.