Hans Ebert

Influence of nearby obstacles on the feasibility of a Huygens box as a field source

A method of substituting an electronic module with its Huygens box representation for the purpose of calculating the emitted field is discussed. It is pointed out that nearby obstacles may have harmful effect on the accuracy of such method. This is subsequently proven by performing finite-difference time-domain simulations on a simplified model of a printed circuit board (PCB) with a parallel open-ended cable in the vicinity. A solution to the problem is proposed: inclusion of the reduced model of the module inside the Huygens box, e.g. only the ground plane of the PCB. It is demonstrated that the described solution has the potential to decrease the errors to acceptable levels.

On the applicability of the surface equivalence theorem inside enclosures

A scenario of a generic printed circuit board (PCB) representing an electronic module inside a metallic enclosure is studied numerically. Following the surface equivalence theorem, the PCB is replaced with surface currents running on a Huygens box (HB) inside the enclosure and near-field errors with respect to the full model are observed. In concordance with previous work it is found that leaving the HB empty leads to significant errors. This time, however, countermeasures in the form of including the ground plane or substrate of the PCB inside the HB have the desired effect of reducing the errors at only some of the investigated frequencies.

Assessment of the usability of the workbench Faraday Cage Method

The workbench Faraday Cage method (WBFC) is a time efficient module pre-compliance test regarding radiated emission. This work investigates the methods usability and credibility and concludes that for this particular case the WBFC perform a tolerable compliance test for frequencies below 360 MHz while it is essentially useless for higher frequencies.