Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers

On the Shielding Effectiveness Calculation of Enclosures Through Measurements in Reverberation Chambers

“…Measurements acquired in the RC at University of Nottingham for results in [39] are reused here for our current purpose. The RC has dimensions of (4.84 × 3.72 × 3.11) m 3 and the enclosure has dimensions of (0.36 × 0.45 × 0.54) m 3 .…”

“…The RC has dimensions of (4.84 × 3.72 × 3.11) m 3 and the enclosure has dimensions of (0.36 × 0.45 × 0.54) m 3 . Note that the inner chamber in [39] is the enclosure in this paper. It has an aperture, whose size is 0.05 m × 0.05 m, which is closed both with a 'copper mesh' and with a metallic plate for tests.…”

“…The transmission coefficient inside the outer chamber ([S21]o,o) and that between outer and inner chambers ([S21]o,i) were measured for the three abovementioned configurations. In this case, measurements of the reflection coefficient ([S22]i), which corresponds to the horn antenna within the enclosure, are not available as they were not acquired during measurements for the purposes of [39]. Therefore, measurements are not corrected for the possible appreciable impedance mismatch at the low frequencies of the horn antennas placed within the enclosure.…”

“…The latter two antennas are a double ridged horn antenna from AH Systems, model SAS-571 and a homemade discone antenna, which works well in the FR from 1 GHz to 10 GHz. It is specified that inside the enclosure are present two antennas because the same measurement set-up for SE of material is considered [39]. Actually, only measurements from the horn antenna are used; that is, the horn antenna has to be considered as the receiving antenna inside the enclosure.…”

“…Again, it is verified that the samples of have an exponential distribution to the significance of 0.05 from the smaller acquired frequency fmin = 800 MHz. Three configurations of the enclosure were considered: one where the aperture having dimension 10 cm x 10 cm is completely closed by an aluminum sheet, one where the same aperture is covered by an aluminum mesh, and the third where the aperture is completely open [39]. They are denoted by conf.…”