1. Akyildiz, I. F., W. Y. Lee, M. C. Vuran, and S. Mohanty, "Next generation/dynamic spectrum access/cognitive radio wireless networks: A survey," Comp. Networks J., Vol. 50, 2127-2159, Sep. 2006.
doi:10.1016/j.comnet.2006.05.001
2. Mitola, J., Introduction in Cognitive Radio Architecture: The Engineering Foundations of Radio XML, John Wiley & Sons, Inc., 2005.
3. Arslan , H., Cognitive Radio, Software Defined Radio, and Adaptive Wireless Systems, Springer, 2007.
doi:10.1007/978-1-4020-5542-3
4. Fett, B. A., "Cognitive Radio Technology," Elsevier, 2009.
5. Oh, S.-H., H. Song, J. T. Aberle, B. Bakkaloglu, and C. Chakrabarti, "Automatic antenna-tuning unit for software-defined and cognitive radio," Wireless Communications & Mobile Computing, Vol. 7, No. 9, 85-88, Nov. 2007.
6. Abu Tarboush, H. F., S. Khan, R. Nilavalan, H. S. Al-Raweshidy, and D. Budimir, "Reconfigurable wideband patch antenna for cognitive radio," 2009 Loughborough Antennas and Propagation Conference, 141-144, Nov. 2009.
7. Hall, P. S., P. Gardner, J. Kelly, E. Ebrahimi, M. R. Hamid F. Ghanem, F. J. Herraiz-Martinez, and D. Segovia-Vargas, "Reconfigurable antenna challenges for future radio systems," 2009 Berlin EuCAP Antennas and Propagation Conference, 949-955, Jun. 2009.
8. Neihart, N. M., S. Roy, and D. J. Allstot, "A parallel, multi-resolution sensing technique for multiple antenna cognitive radios," ISCAS 2007 IEEE International Symposium on Circuits and Systems, 2530-2533, May 2007.
9. Zhang, R. and Y.-C. Liang, "Exploiting multi-antennas for opportunistic spectrum sharing in cognitive radio networks," IEEE Journal of Selected Topics in Signal Processing, Vol. 2, No. 1, 88-102, Feb. 2008.
doi:10.1109/JSTSP.2007.914894
10. Wu, T., R. L. Li, S. Y. Eom, K. Lim, S. I. Jeon, J. Laskar, and M. M. Tentzeris, "A multiband/scalable reconfigurable antenna for cognitive radio base stations," 2008 IEEE Antennas and Propagation Society International Symposium, 1-4, Jul. 2008.
11. Harada, H., "A software defined cognitive radio prototype," IEEE PIMRC 2007 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 1-5, Sep. 2007.
12. Liang, J., C. C. Chiau, X. Chen, and C. G. Parini, "Study of a printed circular disc monopole antenna for UWB systems," IEEE Transactions on Antennas and Propagation, Vol. 53, No. 11, 3500-3504, Nov. 2005.
doi:10.1109/TAP.2005.858598
13. Sim, , C.-Y.-D., W.-T Chung, and C.-H. Lee, "A circular-disc monopole antenna with band-rejection function for ultrawideband application," Microwave and Optical Technology Letters, Vol. 51, No. 6, 1607-1613, Jun. 2009.
doi:10.1002/mop.24379
14. Computer Simulation Technology (CST) Microwave Studio, Electromagnetic Field Simulation software, , Darmstadt, Germany, www.cst.com .
15. Grayver, E., "Standardization efforts for software-defined radio," 2010 IEEE Aerospace Conference, 1-8, Mar. 2010.
doi:10.1109/AERO.2010.5446909
16. Cai, Y., H. Cui, and Z. Feng, "The research of the frequency dependency of UWB antenna radiation pattern," Proceeding of 2010 IEEE International Conference on Ultra-wideband, 1-4, 2010.
doi:10.1109/ICUWB.2010.5614153
17. Kelly, J. R., E. Ebrahimi, P. S. Hall, P. Gardner, and F. Ghanem, "Combined wideband and narrowband antennas for cognitive radio applications," 2008 IET Seminar on Cognitive Radio and Software Defined Radios: Technologies and Techniques, 1-4, Sep. 2008.
18. Ghanem, F., P. S. Hall, and J. R. Kelly, "Two port frequency reconfigurable antenna for cognitive radios," Electronics Letters, Vol. 45, No. 11, 534-536, May 2009.
doi:10.1049/el.2009.0935
19. Ebrahimi, E. and P. S. Hall, "A dual port wide-narrowband antenna for cognitive radio," EuCAP 2009 3rd European Conference on Antennas and Propagation, 809-812, Mar. 2009.
20. Rao, P. H., "Antenna confirations for software defid radio and cognitive radio communication architecture," ICWCSC 2010, International Conference on Wireless Communication and Sensor Computing, Jan. 1-4, 2010.
21. Ebrahimi, E. and P. S. Hall, "Integrated wide-narrow band antenna for multiband applications," Microwave and Optical Technology Letters, Vol. 52, No. 2, 425-430, Feb. 2010.
doi:10.1002/mop.24926