Co-simulation method to predict multi-physical effects on patch antenna

This paper proposes an electromagnetic-thermal-stress co-simulation methodology to predict radiation characteristic and other working performance of patch antenna in the condition of multi-physical coupled field. It is proved that certain crucial working parameters of patch antenna were threatened significantly under thermal stress. Using this case, we developed an electromagnetic-thermal-stress co-simulation method to estimate radiation characteristics of patch antenna with consideration of the multi-physical effects coupled by temperature field, stress field and electromagnetic field. Bases upon the complicated and harsh environment when antennas are installed on aircraft or other modern hi-tech weapons, we establish an 80°C working environment model; build up the structure and electromagnetic model of patch antenna in this condition. Then, thermal effects and electromagnetic effects of patch antenna are both studied. With the application of co-simulation method mentioned above, numerical simulation of electromagnetic-thermal coupling effects of patch antenna is carried out, physical deformation caused by thermal-mechanical coupling were predicted and simulated in an accurate numerical calculation method, and deviation of S parameters and antenna pattern were calculated using FDTD (Finite Difference Time Domain) method. Co-simulation method presented in this paper could provide theoretical foundation and design method for the design of patch antenna working in harsh environment.