By Luigi Amaduzzi, Fondazione Ugo Bordoni – Pontecchio Marconi, and Maurizio Tinti, DEI – Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”, University of Bologna, Italy
The implementations of radiometers for the demonstration of human emission of microwave electromagnetic fields that use a low noise block (LNB) as reception front end generally follow the typical diagram of the Total Power receivers. They sense between 11GHz and 12GHz – the radio frequency band of an LNB. Literature has described very simple implementations with single receivers, and new architectures and calibration improvements have also been made. In one such previous system (Elettronica e Telecomunicazioni, Centro Ricerche e Innovazione Tecnologica RAI, year LV, no. 2, pp. 7-14, Aug. 2006), at environment temperature TEnv = 300K, the receiver’s noise temperature TR corresponds to the LNB’s noise figure (NF) of 0.3dB .