Total Isotropic Sensitivity

Total Isotropic Sensitivity (TIS) is a RF engineering term used to describe the total available receive performance of a device with a real antenna. TIS is expressed in terms of power: Watts (W), milliwatts (mW), or the logarithmic terms for W and mW (dBW and dBm; most commonly, dBm). Antenna efficiency is expressed either in percentage or dB. In Figure 1 below, antenna efficiency, ηantenna, is the ratio of output power to input power. 

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