The EM-2108 is a standard test fixture for evaluation of the electromagnetic shielding effectiveness (SE) of planar materials. The fixture is a section of coaxial transmission line broken to allow the insertion of planar test materials. Although ASTM D4935-10 is currently limited to an upper frequency of 1.5 GHz, the EM-2108 meets and complies fully with both the impedance and SE requirements called out in ASTM test method D4935-10 up to 10 GHz. These results are shown in Figures 1 & 2. The measured data relates to the shielding effectiveness due to a plane wave (far field EM wave) from which near field values for magnetic and electric fields may be inferred.
The EM-2108 is provided with a reference standard test specimen, a load standard test specimen, and a dynamic range specimen. Dynamic range of greater than 80 dB is achievable, although the cables and other test system components usually establish the limiting factors.
Frequency Range: 1.5 GHz – 10 GHz
Fixture Impedance: 50 ± 0.5 Ω
Measured SE of a Gold Specimen: 32 ± 3 dB
Connector: Type N
Length: 14 cm (5.5”)
Height (Vertical): 16.9 cm (6.63’’)
Height (Horizontal): 11.9 cm (4.7’’)
Fixture Diameter: 3.2 cm (1.26″)
Base Diameter: 15.25 cm (6’’)