We are doing EMC test the Capacitance sensing Touch panel, pursues immunity issues versus 28MHz noise. We do it in 2 methods:
(1) The operator is holding an antenna(which generated 28MHz noise), and simultaneously touch the panel to test sensing behavior. (2) The operator is holding an antenna(which generated 28MHz noise), and another people go to touch the panel to test sensing behavior.
As a result, noise level monitored in method (1) is by far higher than in method (2) and it could not report relevant sensing behavior.
I want to know by what mechanism that noise transfer from antenna to the panel though human body when test operator is going to touch the panel? In general, should the operator hold the antenna during test sensing behavior?
Thank you in advanced.