Presently, Ultra Wide Band (UWB) radio technology has attracted much interest in academics, industrial and standardization (IEEE) activities. UWB characterizes transmission systems with instantaneous spectral occupancy of higher bandwidth or higher fractional bandwidth. The antenna is one of the overlooked part of a RF (Radio Frequency) design. The range, performance, and legality of a RF link are significantly dependent upon the antenna. The UHF (Ultra High Frequency) TV Band is exclusively addressed in IEEE802.22 standardization. The UHF TV band is 336MHz wider according to CCIR (Consultative Committee on International Radio) standards. One major challenge in designing a UWB antenna for UHF band is limiting the physical size of the antenna. Authors have previously illustrated the design, implementation and testing of a UWB antenna for cognitive radios in the UHF TV Band[1]. Although it gives better results, performances at lower frequencies are slightly below than the higher frequencies. This problem can be rectified by introducing an impedance matching circuit at particular frequencies. Since it is required to cover a wider bandwidth several matching circuits could be introduced, but it is not practical because of size, complexity, losses, Electromagnetic interferences (EMI) and cost. Therefore this paper presents a simple and low cost Tuneable Antenna design which is controlled by software instructions. Hence this antenna design can be used in implementing cognitive radios in the UHF TV Band.
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