Abstract
In high-power microwave applications, the electromagnetic-thermal effect of frequency selective surface (FSS) cannot be ignored. In this paper, the electromagnetic-thermal coupling effects of cross-slot FSS were studied. We used an equivalent circuit method and CST software to analyze the electromagnetic characteristics of cross-slot FSS. Then, we used multi-field simulation software COMSOL Multiphysics to study the thermal effect of the FSSs. To verify the simulation results, we used a horn antenna with a power of 20 W to radiate the FSSs and obtain the stable temperature distribution of the FSSs. By using simulations and experiments, it is found that the maximum temperature of the cross-slot FSS appears in the middle of the cross slot. It is also found that the FSS with a narrow slot has severer thermal effect than that with a wide slot. In addition, the effects of different incident angles on the temperature variation of FSS under TE and TM polarization were also studied. It is found that in TE polarization, with the increase in incident angle, the maximum stable temperature of FSS increases gradually. In TM polarization, with the increase in incident angle, the maximum stable temperature of FSS decreases gradually.
Highlights
Multi-physical field coupling problem means that in practical engineering applications, there are many physical fields at the same time, such as electromagnetic (EM) field, thermal field, stress field, humidity field, etc., which are always superimposed and affected by each other
It is found that the maximum temperature of cross-slot frequency selective surface (FSS) is concentrated in the middle of the slot, and the narrower the slot is, the more obvious the temperature effect is
Radiation due to the limitation of experimental equipment, the conclusions obtained from the simulations and experiments are applicable in the high-power microwave (HPM) field
Summary
Multi-physical field coupling problem means that in practical engineering applications, there are many physical fields at the same time, such as electromagnetic (EM) field, thermal field, stress field, humidity field, etc., which are always superimposed and affected by each other. In some high-power microwave (HPM) applications, the EM-thermal effect of frequency selective surface (FSS) cannot be ignored either. When a high-power EM wave or strong EM pulse radiates on the surface of FSS, the EM energy loss often causes the temperature rise in the FSS structure, which will bring the mutual coupling of EM field and thermal field. In [21], the authors demonstrated that when the FSS is irradiated at high power, a breakdown at one location may cause a breakdown at another location, where the local electric field intensities are not high enough to cause breakdown under normal circumstances These studies only focus on the EM characteristics of the metamaterials and verify the thermal effect or power tolerance by experiments. We used the multi-field simulation software COMSOL Multiphysics to study the EM-thermal coupling effect of the cross-slot FSS structure.
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