CST - Shielding effectiveness of Low frequency

Hello all,
For low frequency shielding effectiveness (10Hz-10MHz). I want to create inside magnetic field source and outside magnetic field probe is kept as in the figure shown.
How can I create magnetic field source?
Created the circular loop antenna the field probe did not pick the field after placing the enclosure. The enclosure was copper of electrical conductivity 5.82e+07S/m. The thickness of the enclosure is 0.1mm. Length of the enclosure is 100mm and width of the enclosure is 50mm. 
Please provide the procedure to create magnetic field source.

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