Antenna Systems & Technology - Fall 2016 - 10

FEATURE ARTICLE ing impedance, Design 2 has as good, if not better, performance than Design 1 across all dielectrics. Design 2 has a much wider matched frequency band across all dielectrics and no scaling was required. Finally, Figure 13 shows the radiation performance of Design 2, again showing good performance. Figure 12. Design 2 return loss. Conclusion The examples illustrate that it is possible to automatically synthesize a new RFID antenna in AntSyn that will work on multiple substrates. The synthesis process can match the chip antenna impedance, work over multiple dielectrics, and do so with minimal human effort required. This new capabilFigure 13. Design 2 maximum gain vs. frequency and radiation patterns for the e_r=3 and ity within AntSyn can be 13 cases. used for many applications in addition to RFID antenna design, such as to increase yield for antennas that are sensitive to dielectrics or for body-worn or body-internal antenna design. Future work in this area will include adding multiple bands to accommodate worldwide UHF RFID frequencies, adding more dielectric variety, looking at how polarization can be added to the synthesis, and exploring the limits of how small the antenna can be when synthesized in this fashion. Readers are encouraged to learn more by visiting www.awrcorp.com/antsyn or by reaching out to the authors through email. Derek.Linden@ni.com, Jennifer.Rayno@ni.com References [1] Gaetano Marrocco, "The Art of UHF RFID Antenna Design: Impedance-Matching and Size-Reduction Techniques," IEEE Antennas and Propagation Magazine, Vol. 50, No. 1, February 2008, pp.66-79. [2] Harrington, R. F. (1960). "Effects of antenna size on gain, bandwidth, and efficiency". Jour. Nat'l Bureau of Standards. Washington D.C. USA: US National Bureau of Standards. 64-D: 1-12. [3] Milan Polivka, Milan Svanda, "Stepped Impedance Coupled-Patches Tag Antenna for Platform-Tolerant UHF RFID Applications," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 9, pp. 3791-3797, September 2015. [4] Shuai Shao, Robert J. Burkholder, and John L. Volakis, "Design Approach for Robust UHF RFID Tag Antennas Mounted on a Plurality of Dielectric Surfaces," IEEE Antennas and Propagation Magazine, Vol. 56, No. 5, October 2014, pp 158-166. [5] T. DeJeruyelle, P. Pannier, M. EgeJs, and E. Bergeret, "An RFID Tag Antenna Tolerant to Mounting on Materials," IEEE Antennas and Propagation Magazine, Vol. 52, No. 4, pp 14-19, August 2010. [6] Jun Zhang, Yunliang Long, "A Dual-Layer Broadband Compact UHF RFID Tag Antenna for Platform Tolerant Application." IEEE Transactions on Antennas and Propagation, Vol. 61, No. 9, pp. 4447-4455, September 2013. [7] Jason D. Lohn, Derek S. Linden, Bruce Blevins, Thomas Greenling, Mark R. Allard, "Automated Synthesis of a Lunar Satellite Antenna System," IEEE Trans. Antennas and Propagat., vol 63, no 4, pp.1436-1444, April 2015. [8] B.M. Kolundzija, J.S. Ognjanovic, T.K. Sarkar, R.F. Harrington, "WIPL-program for analysis of metallic antennas and scatterers," Ninth International Conference on Antennas and Propagation, 1995 (ICAP '95), Conf. Publ. No. 407, 4-7 Apr 1995. [9] WIPL-D Pro v11.0, Software and User's Manual, WIPL-D d.o.o., Belgrade, 2014. [10] http://hothardware.com/news/3d-systems-3d-printing-with-conductive-ink-for-project-ara-antennas 10 Antenna Systems & Technology Fall 2016 www.AntennasOnline.com http://www.awrcorp.com/antsyn http://www.hothardware.com/news/3d-systems-3d-printing-with-conductive-ink-for-project-ara-antennas http://www.AntennasOnline.com

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