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Asked Jan 25, 2020

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Establish the relation between dB and dBm while measuring the power of an antenna.

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Step 1

The dBm is a logarithmic unit of power and it stands for power in decibels when the reference power is one milliwatt. If *P _{T}* is the power transmitted by an antenna in watts (W), then the power transmitted by the antenna in dBm can be obtained using the following relation:

The dB is a logarithmic unit of power and it stands for decibels. If *P _{T}* is the power transmitted by an antenna in watts (W), then the power transmitted by the antenna in dB can be obtained using the following relation:

Step 2

Now, if *P* is the amount of power to be converted into dBm or dB, then using equation (1) and (2), the following relation can be written:

The meaning of equation (3) is that if the power in a certain experiment is given as 6 dBm, the value of the corresponding power in dB will be 6-30=-24 dB.

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