Lima, Adelson Menezes, João Victor de Freitas, and Otávio Paulino Lavor. “Analysis of the Resonator Element in Different Positions in the Circular Patch Microstrip Antenna”. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe) 20, no. 1 (December 11, 2020): AoP 16–29. Accessed January 19, 2021. http://www.jmoe.org/index.php/jmoe/article/view/954.