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1 Introduction The word fractal , which derives from the Latin term frangere (that means “to break”), has led to a very important concept in mathematics since Mandelbrot first introduced it in early eighties [ 1 ]. In fact, both the study and analysis of fractal patterns have become more and more important in the last years due to the large number of applications to diverse scientific fields where fractals have been identified. They include economics, physics, and statistics (c.f. [ 2 , 3 ]). In addition, there has also been a special interest in the

.1109/TAP.2009.2028707 [10] Ukkonen L., Schaffrath M., Engels D.W., Sydänheimo L., et al., Operability of folded microstrip patch-type tag antenna in the UHF RFID bands within 865–928 MHz, IEEE Antennas Wireless Propagat. Lett., vol. 5, 2006, 414–417 http://dx.doi.org/10.1109/LAWP.2006.883085 [11] Chen H.D., Tsao Y.H., Low-profile PIFA array antennas for UHF band RFID tags mountable on metallic objects, IEEE Trans. Antennas Propagat., vol. 58, no. 4, Apr. 2010, 1087–1092 http://dx.doi.org/10.1109/TAP.2010.2041158 [12] Werner D.H., Ganguly S., An Overview of Fractal