Active phase array antenna electrical property prediction method based on mechanical, electric and thermal three-field coupling

The invention discloses an electrical property pre-test method based on structure, electromagnet and heat, namely, three-field coupling and used for an active phased array antenna, mainly aiming at solving the problem about how to separate the mechanical part, electrical part and heating part in the structure and heat design for the active phased array antenna. The method includes the following steps: the structure and T/R component temperature are defined based on the structure and heat design parameters of the active phased array antenna; an antenna finite element analysis is carried out according to the result of a temperature difference load analysis to obtain a structure distortion under the antenna heat load and environment load and to analyze the phase difference of an antenna radiation unit; an amplitude phase error of T/R component exciting current is defined with the result of heat analysis; an antenna aperture field amplitude phase distribution can be obtained through the radiation unit phase difference and the exciting current amplitude phase error; an antenna far field direction graph is figured out in virtue of the aperture field distribution and array face irradiance function; then the antenna electrical property parameters can be obtained so as to realize the couple analysis on structure, electromagnet and heat of the active phased array antenna. The invention can be used for guiding the structure design and heat design and electrical property coupling analysis and evaluation of the active phased array antenna.