TY - JOUR A1 - Mulero Martínez, Juan Ignacio T1 - Imaginary-axis crossing points in root loci that depend polynomially on the gain Y1 - 2021 SN - 0005-1098 UR - http://hdl.handle.net/10317/11029 AB - This technical note discusses the crossing with the stability boundary for the root loci that polynomially depend on the gain. A simple calculation method based on reflected polynomials is provided. The trend of the roots is also determined, which allows studying the gain margin as well as the minimum gain so that all the roots are within the stable region. Finally, these concepts are illustrated with two case studies. KW - Ingeniería de Sistemas y Automática KW - Crossover frequencies KW - Gain margin KW - Polynomial root locus KW - Reflected polynomials KW - 3306 Ingeniería y Tecnología Eléctricas LA - eng PB - ELSEVIER ER -