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.