| abstract |
An electromagnetic field measuring device is disclosed having a response which is essentially independent of the physical orientation of the device in the electromagnetic field. Further, the response of the device is essentially independent of the polarization of the field or of the presence of reactive field components or multipath interference. A set of three antennas disposed in a mutually-orthogonal relationship with an essentially common center is provided, the antennas being adapted to be placed in an electromagnetic field to be measured. Sensing means, in the form of diodes for example, are associated with each antenna for deriving a signal therefrom. In the preferred embodiment, such antennas may take the form of dipoles, and diodes are contemplated to be connected between the dipole legs. The derived signals so produced are removed from the antennas in a fashion wherein no substantial perturbation of the field to be measured occurs and without substantially affecting the electrical characteristics of the antenna set. In a preferred embodiment, a high-resistance transmission line is provided. Subsequently, the derived and removed signals are combined and processed so as to generate a measurement reading. |