Benchmark - EMI from Shielding Enclosures

Model

This benchmark problem defined in [1] is a typical application used to show how CEM tools can be effectively used to investigate EM emissions from shielded enclosures with very thin slots. The model is made up of a PEC box, which is fed from above by a 50 ohm coax line, which is grounded to the floor of the box with a resistor. There is a very thin slot in the front wall of the box.

Simulations

A broadband simulation covering the band from 400 MHz - 2.1 GHz. A fine grid resolution is required to resolve the high field gradients, which occur around the slot, the 0.2 mm slot is divided up into 4 grid cells of 0.05 mm. The total grid has about 4 MCells.

Results

The delivered power and peak E-field are recorded. Good agreement with measurement results presented in [1] is achieved.

[1] Min Li; EMI from Shielding Enclosures — FDTD Modeling and Measurements; EMC Laboratory; University of Missouri-Rolla