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As a rule of thumb, a good decoupling required a distance of 5 to 10 λ. 1) In practive, in most cases a distance of 3 λ is sufficient. <html> &lambda = υ </html>
For GSM-R Deutsche Bahn requires a decoupling of up to -60 dBm. According to a simulation of one of our antenna supplier a distanec of 350 cm is sufficant to fulfill this requirements
Source: entkopplung_gsm-r_-_v02.pdf