1. Glover, B. and H. Bhatt, RFID Essentials, O'Reilly, Sebastopol, CA, 2006.
2. Chen, X., G. Fu, S. X. Gong, Y. L. Yan, and W. Zhao, "Circularly polarized stacked annular-ring microstrip antenna with integrated feeding network for UHF RFID readers," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 542-545, Jun. 2010.
doi:10.1109/LAWP.2010.2051791
3. Deng, J.-Y., L.-X. Guo, T.-Q. Fan, Z.-S. Wu, Y.-J. Hu, and J.-H. Yang, "Wideband circularly polarized suspended patch antenna with indented edge and gap-coupled feed," Progress In Electromagnetics Research, Vol. 135, 151-159, 2013.
4. Wang, P., G. Wen, J. Li, Y. Huang, L. Yang, and Q. Zhang, "Wideband circularly polarized UHF RFID reader antenna with high gain and wide axial ratio beamwidths," Progress In Electromagnetics Research, Vol. 129, 365-358, 2012.
5. Tiang, J.-J., M. T. Islam, N. Misran, and J. S. Mandeep, "Circular microstrip slot antenna for dual-frequency RFID application," Progress In Electromagnetics Research, Vol. 120, 499-512, 2011.
6. Chang, T. N. and J. M. Lin, "Circularly polarized ring-patch antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 26-29, 2012.
doi:10.1109/LAWP.2011.2182174
7. Ooi, P. C. and K. T. Selvan, "A dual-band circular slot antenna with an offset microstrip-FED line for PCS, UMTS, IMT-2000, ISM, bluetooth, RFID and WLAN applications," Progress In Electromagnetics Research Letters, Vol. 16, 1-10, 2010.
doi:10.2528/PIERL10051803
8. Fan, Z., S. Qiao, J. T. Huang-Fu, and L.-X. Ran, "Signal descriptions and formulations for long range UHF RFID readers," Progress In Electromagnetics Research, Vol. 71, 109-127, 2007.
doi:10.2528/PIER07021501
9. Kim, D.-Y., H.-G. Yoon, B.-J. Jang, and J.-G. Yook, "Interference analysis of UHF RFID systems," Progress In Electromagnetics Research B, Vol. 4, 115-126, 2008.
doi:10.2528/PIERB08010607
10. Lazaro, A., D. Girbau, and R. Villarino, "Effects of interferences in UHF RFID systems," Progress In Electromagnetics Research, Vol. 98, 425-443, 2009.
doi:10.2528/PIER09101703
11. Lim, W. G., S. Y. Park, and W. I. So, "RFID reader front-end having robust Tx leakage canceller for load variation," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, No. 5, 1348-1355, 2009.
doi:10.1109/TMTT.2009.2017308
12. Bae, J.-H., W.-K. Choi, J.-S. Kim, G.-Y. Choi, and J.-S. Chae, "Study on the demodulation structure of reader receiver in a passive RFID environment," Progress In Electromagnetics Research, Vol. 91, 243-258, 2009.
doi:10.2528/PIER09021103
13. Kim, W. K., W. Na, and J. W. Yu, "A high isolated coupled-line passive circulator for UHF RFID reader," Microwave and Optical Technology Letters, Vol. 50, No. 10, 5297-2600, 2008.
14. Mireles, E. and S. K. Sharma, "A novel wideband circularly polarized antenna for worldwide UHF band RFID reader applications," Progress In Electromagnetics Research B, Vol. 42, 23-44, 2012.
15. Jung, Y. K. and B. Lee, "Dual-band circularly polarized microstrip RFID reader antenna using metamaterial branch-line coupler," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 2, 786-791, 2012.
doi:10.1109/TAP.2011.2167943
16. Secmen, M. and A. Hizal, "A dual-polarized wide-band patch antenna for indoor mobile communication applications," Progress Progress In Electromagnetics Research, Vol. 100, 189-200, 2010.
doi:10.2528/PIER09112607
17. Yao, Y., X. Wang, X. D. Chen, J. S. Yu, and S. H. Liu, "Novel diversity/MIMO PIFA antenna with broadband circular polarization for multimode satellite navigation," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 65-68, 2011.
18. Vongsack, S., C. Phongcharoenpanich, S. Kosulvit, K. Hamamoto, and T. Wakabayashi, "Unidirectional antenna using two-probe excited circular ring above square reflector for polarization diversity with high isolation," Progress In Electromagnetics Research, Vol. 133, 159-176, 2013.
19. Xie, J.-J., Y.-Z. Yin, J. Ren, and T. Wang, "A wideband dual-polarized patch antenna with electric probe and magnetic loop feeds," Progress In Electromagnetics Research, Vol. 132, 499-515, 2012.
20. Segovia-Vargas, D., F. J. Herraiz-Martinez, E. Ugarte-Munoz, L. E. Garcia-Munoz, and V. Gonzalez-Posadas, "Quad-frequency linearly-polarized and dual-frequency circularly-polarized microstrip patch antennas with CRLH loading," Progress In Electromagnetics Research, Vol. 133, 91-115, 2013.
21. Liu, C., J.-L. Guo, Y.-H. Huang, and L.-Y. Zhou, "A novel dual-polarized antenna with high isolation and low cross polarization for wireless communication," Progress In Electromagnetics Research Letters, Vol. 32, 129-136, 2012.
22. Krairiksh, M., P. Keowsawat, C. Phongcharoenpanich, and S. Kosulvit, "Two-probe excited circular ring antenna for MIMO application," Progress In Electromagnetics Research, Vol. 97, 417-431, 2009.
doi:10.2528/PIER09091607
23. Wu, G.-L., W. Mu, G. Zhao, and Y.-C. Jiao, "A novel design of dual circularly polarized antenna FED by L-strip," Progress In Electromagnetics Research, Vol. 79, 39-46, 2008.
doi:10.2528/PIER07092001
24. Chou, H.-T., H.-C. Cheng, H.-T. Hsu, and L.-R. Kuo, "Investigations of isolation improvement techniques for multiple input multiple output (MIMO) WLAN portable terminal applications," Progress In Electromagnetics Research, Vol. 85, 349-366, 2008.
doi:10.2528/PIER08090905
25. Zhang, M. T., Y. B. Chen, Y. C. Jiao, and F. S. Zhang, "Dual circularly polarized antenna of compact structure for RFID application," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 14, 1895-1902, 2006.
doi:10.1163/156939306779322611
26. Chang, T. N. and J. M. Lin, "A novel circularly polarized patch antenna with a serial multislot type of loading," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 11, 3345-3348, 2007.
doi:10.1109/TAP.2007.908846
27. Paret, D., RFID at Ultra and Super High Frequencies Theory and Application, 2nd Edition, Wiley, United Kingdom, 2009.
28. , , , Online available: http://www.tek.com/sites/tek.com/files/media /media/resources/37W 18864 2.pdf.
29. , , , Online available: http://www.rfidinfo.jp/whitepaper/379.pdf.