Antenna Challenges in Cognitive Radio

The cognitive radio concept throws up significant challenges for antenna design. Whilst there are many possible ways in which such systems could be configured, the range of possible antenna requirements is discussed, and some design approaches are outlined. Some demonstrator antennas are described. Results for three antennas, suitable for small terminals, are given, in which integration into a single antenna of wideband and narrowband functionality, necessary for search and operation respectively, is achieved. The performance of these is finally compared to an array with band switching, which may be useful in systems that require both spatial and spectral discrimination.

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