Water pipes, ventilation, windows, electrical supplies, data/telephone can all be incorporated into the shielded room.
The two most common anechoic standards are:
The MIL STD 461 is a less stringent requirement and can be fulfilled by the use of pyramidal absorber (RAM), the DEF STAN 59-411 demands measurement accuracy below 80MHz and thus requires the use of ferrite tiles.
In the future there will be a requirement for all equipment to be ‘CE marked’ and so commercial EMC requirements will apply, a correctly designed DEF STAN 59-411 chamber will meet both military and commercial applications.
Above picture - MRI shielded chamber – Hammersmith Hospital, London
Level 1 – This is basically a high performance steel modular room built into the structure of a building and can achieve -100dB of attenuation.
Level 2 – Conductive fabric or copper foil lined rooms.
