The temperature (Ta) that yields the available power spectral density from a source. It is obtained when the corresponding reflection coefficients for the generator and load are complex conjugates. The relationship to the available power Pa is
where k is Boltzmann’s constant
and B is the bandwidth of the power measurement.
The power spectral density across the measurement band is to be constant.
Source: Keysight Technologies. Fundamentals of RF and Microwave. Noise Figure Measurements. Application Note. www.keysight.com
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