With voltage (field) values (equal phase) the calculation rule is:
Sum in dB = 20 × log10(10(dB1/20) + 10(dB2/20) + ... 10(dBn/20))
With a phase angle unequal 0° the vectors must be added (amount and phase)
and then the dBs of the normal vector have to be calculated:
With energy (power) values (random phase) the calculation rule is:
Sum in dB = 10 × log10(10(dB1/10) + 10(dB2/10) + ... 10(dBn/10))
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