1. Vainikainen, P., J. Holopainen, C. Icheln, O. Kivekas, M. Kyro, M. Mustonen, et al. "More than 20 antenna elements in future mobile phones, threat or opportunity?," Proceedings of 3rd European Conference on Antennas and Propagation, 2940-2943, 2009. Google Scholar
2. Mitola, J., "Cognitive radio: Making software radio more personal," IEEE Personal Comms., Vol. 6, 13-18, Aug. 1999.
doi:10.1109/98.788210 Google Scholar
3. Ashley, S., "Cognitive radio," Scientific American Magazine, Feb. 2006. Google Scholar
4. Hur, Y., J. Park, W. Woo, K. Lim, C.-H. Lee, H. Kim, et al. "A wideband analogue multi-resolution spectrum sensing (MRSS) technique for cognitive radio (CR) systems," Proc. IEEE Circuits and Systems, 4090-4093, 2006. Google Scholar
5. Dong, T. and Y. Chen, "Novel design of ultra-wideband printed double-sleeve monopole antenna," Progress In Electromagnetics Research Letters, Vol. 9, 165-173, 2009.
doi:10.2528/PIERL09052805 Google Scholar
6. Liao, W.-J., S.-H. Chang, and L.-K. Li, "A compact planar multiband antenna for integrated mobile devices," Progress In Electromagnetics Research, Vol. 109, 1-16, 2010.
doi:10.2528/PIER10083001 Google Scholar
7. Wu, C. Y., C. L. Tang, and A. C. Chen, "Compact surface-mount uwb monopole antenna for mobile applications," PIERS Proceedings, 150-152, Cambridge, USA, March 26-29, 2006. Google Scholar
8. Pagna, E., "Evolution of base station antennas for radiomobile communications from the fixed beam to the smart antennas," Proceedings of the International Symposium on Antennas, 2002. Google Scholar
9. Wong, K., G. Lee, and T. Chiou, "A low-profile planar monopole antenna for multiband operation of mobile handsets," IEEE Trans. Antennas and Propag., Vol. 51, No. 1, 2003.
doi:10.1109/TAP.2003.817997 Google Scholar
10. Kelly, J. R., P. S. Hall, and P. Song, "A reconfigurable wideband handset antenna operating from 460MHz to 12 GHz," Proceedings of the IEEE International Symposium on Antennas and Propagation , 2009. Google Scholar
11. Hall, P., P. Gardner, J. Kelly, E. Ebrahimi, M. Hamid, F. Ghanem, et al. "Reconfigurable antenna challenges for future radio systems," Proceedings of 3rd European Conference on Antennas and Propagation, 949-5, 2009. Google Scholar
12. Bowick, C., RF-Circuit Design, 66-72, Indianapolis, IN, Newnes, 1997.
13. Ebrahimi, E., J. Kelly, and P. Hall, "A reconfigurable narrowband antenna integrated with wideband monopole for cognitive radio applications," Proceedings of IEEE International Symposium on Antennas and Propagation, 2009. Google Scholar
14. Ebrahimi, E., J. Kelly, and P. Hall, "Integrated wide-narrowband antenna for multi-standard radio," IEEE Trans. Antennas and Propag., Vol. 59, No. 7, 2628-2635, Jul. 2011.
doi:10.1109/TAP.2011.2152353 Google Scholar