Study of effect on electromagnetic field caused by penetrating conductor and its load circuit in metal cavity

In order to study effect on electromagnetic field in cavity affected by penetrating conductor and its circuit, different models of penetrating conductor and its circuit were established. Electromagnetic simulation software CST was used to do simulation. Experimental system was set up with a GTEM chamber, a vector network analyzer, a power amplifier, ETS electric field probe to verify simulation results. Laws of influence on electromagnetic field in cavity by penetrating conductor coupling and its terminal load effect have been revealed. Results show that electromagnetic field in cavity is affected by the combination of penetrating conductor resonance and cavity resonance. Electric field strength got extremum at resonant frequencies. Shielding effectiveness curve of penetrating conductor open at two terminal was close to it of penetrating conductor loading but not grounding model. Electric field of penetrating conductor loading grounding directly was significantly lower while resonant frequency reduced. Changing laws of penetrating conductor loading floating grounding was similar to model of penetrating conductor loading but not grounding in low frequency and similar to model of penetrating conductor loading grounding directly in high frequency.