Tham khảo tài liệu 'advanced radio frequency identification design and applications part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Design and Fabrication of Miniaturized Fractal Antennas for Passive UHF RFID Tags 49 The measured return loss is -17 dB at a resonant frequency MHz compared with the simulated one of -26 dB at 900 MHz and the bandwidth is MHz compared with the simulated bandwidth of 59 MHz . The disagreement between measured and simulated results of the fractal loop antenna is attributed to the fact that we lack sufficient information from the vendor of FR-4 material. This information would enable us to build accurate model for the dielectric material in the EM simulator instead of working with single frequency point data. The radiation pattern for the fractal dipole antenna is measured in anechoic chamber as shown in Fig. 29 which is in good agreement with the simulated results. Fig. 29. Measured radiation pattern. 5. References Andrenko A. S. 2005 . Conformal Fractal Loop Antennas for RFID Tag Applications Proceedings of the IEEE International Conference on Applied Electromagnetics and Communications ICECom. Pages 1-6 Oct. 2008. Balanis C. A. 1997 Antenna Theory Analysis and Design Jhon Whily New York 2nd Edition . Baliarda C. P. Romeu J. Cardama A. M. 2000 The Koch monopole A small fractal antenna. IEEE Trans. on Antennas and Propagation 2000 page numbers 1773-1781 . Curty J. P. Declerdq M. Dehollain C. Joehl N. 2007 . Design and Optimization of Passive UHF RFID Systems Springer ISBN 0-387-35274-0 New Jersey. Sabaawi A. M. A. Abdulla A. I. Sultan Q. H. 2010 Design a New Fractal Loop Antenna For UHF RFID Tags Based On a Proposed Fractal Curve Proceedings of The 2nd IEEE International Conference on Computer Technology and Development ICCTD 2010 November 2-4 2010 Cairo Egypt. Sabaawi A. M. A. Quboa K. M. 2010 . Sierpinski Gasket as Fractal Dipole Antennas for Passive UHF RFID Tags. Proceedings of The Mosharaka International Conference on Communications Electronics Propagation MIC-CPE2010 3-5 March 2010 Amman Jordan. 50 Advanced Radio Frequency Identification .
