Patent No. 3555529 Apparatus for measuring electric field radiation from living bodies
Patent No. 3555529 Apparatus for measuring electric field radiation from living bodies (Brown, et, al., Jan 12, 1971) Abstract An antenna, electrically short in comparison to a wavelength to be received, is positioned in close proximity to a living body to receive the electric energy radiated therefrom in the frequency range of from 0 to 3 kHz. An impedance matching device is connected directly to the antenna to convert the received energy into electrical signals for processing. The ambient noise components are removed from these electrical signals, either by physically shielding the body undergoing test and the antenna, by employing a second similar antenna to receive the ambient noise but not the signal radiated from the body undergoing test and electrically combining the signals from both said antennas to eliminate the ambient noise components, or by employing a tuned filter, for those ambient noise components having a per