Relationship among resonant frequencies of Sierpinski multiband fractal antennas Ivan R. Gonzalez-Rangel, Genaro Hernandez-Valdez, Edgar A. Andrade-Gonzalez, Mario Reyes-Ayala, J. R. Miranda-Tello and Jose Serrano-Chavez ITM Web Conf., 9 (2017) 03012 Published online: 09 January 2017 DOI: 10.1051/itmconf/20170903012