Tham khảo tài liệu 'current trends and challenges in rfid part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 110 Current Trends and Challenges in RFID characterization. The parameters are mainly related to scattering parameters including return loss and VSWR as well as radiation characteristics like radiation patterns antenna gain polarization and so on. Moreover a wide literature review has been done in order to identify the techniques to design multi-band microstrip antennas. Mostly dual-frequency operation is discussed since they mean the basics of multi-band operation. However it has been seen that these techniques can be combined to enhance multi-band antennas with wider bandwidths. Finally the high gain antennas and limitations have been described and it is realized that the conventional feeding technique might limit the performance of multi-band antennas to only one frequency. 7. Reference Chen . Wang . Lin . Lin . Pan . 2009. A compact dual-band dielectric resonator antenna using a parasitic slot. IEEE Antennas and Wireless Propagation Letters 8 173-176. Ding Y. Leung . 2009. Dual-band circularly polarized dual-slot antenna with a dielectric cover. IEEE Transactions on Antennas and Propagation 57 12 37573764. Dobkin D. M. 2007. The RF in RFID Passive UHF RFID in Practice. Massachusetts Newnes Newton. Gao . Li . Yeo . Leong . 2002. Small dual-frequency microstrip antennas. IEEE Transactions on Antennas and Propagation 51 1 28-36. Garfinkel S. Holtzman H. 2005. Understanding RFID Technology. Upper Saddle River Addison-Wesley. He X. Hong S. Xiong H. Zhang Q. Tentzeris . 2009. Design of a novel high-gain dual-band antenna for WLAN applications. IEEE Antennas and Wireless Propagation Letters 8 798-801. Heikkinen J. Kivikoski M. 2003. A novel dual-frequency circularly polarized rectenna. IEEE Antennas and Wireless Propagation Letters 2 330-333. Intermec Technologies Corporation. 2006. RFID overview introduction to radio frequency identification. Whitepaper RFID Journal. Jianhui G. Shunshi Z. Linglong X. Zhu S. 2008. Dual-band
