The high current consumption of the amplifying cascades in the miniature case of the radiometric receiver with these microcircuits existing today leads to a significant increase in temperature inside the case and subsequent heating with distortion of the picture of the real field of internal temperatures and soil humidity. The existing problem can be solved by creating new active elements from specialized monolithic microwave chips - low-noise transistors, for which the requirements of high energy efficiency will be taken into account when designing heterostructures. The article presents the results of numerical simulation of a low-noise transistor with low power consumption for use in monolithic integrated circuits of an energy-efficient low-noise amplifier of a miniature radiometer.