Accession Number : ADD008710

Title :   EM Sensor for Determining Impedance of EM Field.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Cuneo,Andrew A , Jr ; Loftus,James J

Report Date : 19 Jun 1981

Pagination or Media Count : 9

Abstract : A method and device are given for determining the impedance of the electric and magnetic fields in the near and far fields associated with a radiating antenna. The electric and magnetic field components are sensed in a far field location and the system is calibrated using a known relationship between the electric and magnetic field components. The sensed signals are transmitted optically via a fiber optic link to an optical receiver. The received optical signals are modulated by an audio signal generator and input into a ratio detector via variable attenuators which are used to calibrate the system. Multiple subsequent ratios are measured and recorded as a function of location of the sensor.

Descriptors :   *Patent applications, *Electrical impedance, *Antenna radiation patterns, Near field, Far field, Calibration, Signal processing, Optical processing, Fiber optics transmission lines, Electric fields, Magnetic fields, Ratios, Ground effect

Subject Categories : Electricity and Magnetism
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE