Broadband isotropic antenna with fiber-optic link to a conventio

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With waveguide or long line

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Details

324 725, 324 96, 343703, G01R 2104, G01R 3100

Patent

active

040913279

ABSTRACT:
A broadband active isotropic receiving antenna for use with a conventional lectromagnetic interference receiver to measure weak near-zone electric fields of unknown polarization. The antenna consists of three mutually orthogonal active dipoles, including RF amplifier circuitry and light emitting diode means, located therein coupled to fiber optic waveguide means. The frequency range of each of the three field components is amplified and used to modulate respective light emitting diodes whose modulated infrared or visible signals are guided through the fiber optic waveguide means to photo-detectors at the far end of the fiber optic guides. These photo-detectors recover the RF modulation from the IR carrier which is then time multiplexed for input to the electromagnetic interference receiver. The DC output from the receiver is processed to provide an output voltage proportional to the square root of the sum of the squares, i.e. the Hermitian magnitude of the three mutually orthogonal electric field components.

REFERENCES:
patent: 3461384 (1969-08-01), Bayati et al.
patent: 3750017 (1973-07-01), Bowman et al.

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