Importance

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Abstract

An electromagnetic probe for the detection of both E-field and H-field radiation includes a quasi-isotropic E-field antenna and a quasi-isotropic H-field antenna. The quasi-isotropic E-field antenna includes three mutually orthogonal surface area antenna elements which define three mutually perpendicular planes and an apex. Each surface area element is responsive to E-field radiation normal to the surface of that element and produces an output voltage signal proportional thereto. The quasi-isotropic H-field antenna includes three mutually orthogonal electrically small loop antenna elements. Each loop antenna element is responsive to H-field radiation which is incident normal to the plane of the element. Each loop antenna element produces an output voltage signal proportional to the field strength of the H-field radiation. The H-field antenna is affixed substantially proximate to the apex which is defined by the E-field antenna. Detection circuits receive the signals from each of the surface area antenna elements and loop antenna elements and produce output signals proportional to received field strength signals. Thus formed, the electromagnetic probe detects both E-field and H-field radiation over a frequency range of about 0.1 to about 300 MHZ with a substantially flat frequency response.

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First Claim