System Level Emi Diagnostic by Terminated Loop Antenna Concept

In modern server system design, EMI (electromagnetic interference) diagnostics is not work straightforwardly due to the complexity of the system. Analysis of EM (electromagnetic) radiation and shielding design is usually based on the assumption of a simplified radiation source, that is, a dipole antenna. However, EMI issues still occur even based on rules or formulas driven by the assumption. This paper provides another approach based on the terminated loop antenna concept and starts from actual EMI issues of two server systems. With the assumption, radiation mechanism is more close to actual condition and loop area difference is consistent with the actual failure syndrome