Measurement and simulation of moisture effects on electromagnetic radiation of printed circuit boards

In this paper the effect of humidity aging on the electromagnetic radiation behavior of a printed circuit board is presented. Experimental study of the aging effect on the losses in electromagnetic radiation of the test structure was performed using a near field test bench. The samples were aged at various levels of temperature and aging times were used to measure the water absorption and the degradation of conductor's roughness surface. Numerical simulations were conducted to explore the root cause and try to validate the experimental measurements. A simulation method was established to simulate the impact of the water absorption and conductor's surface roughness.