Novel tri-band antenna end-loaded with Koch fractal loops

A novel tri-band antenna end-loaded with Koch fractal loops and was designed for radio frequency identification (RFID) applications, based on FR4 substrate. Before and after introducing a mirror array and meander-line structure, the proposed antenna was simulated and investigated. The results show that great improvements have been reached, including the return loss decreased to about 56 dB and the bandwidth increased to 420 MHz at 2490 MHz, with the miniaturized size. With a prototype fabrication, we also verified good performance of the optimized antenna through the comparison analysis of measurement and simulation. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:620–623, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26657