| 摘要 |
Apparatus for communicating electromagnetic energy between a logging tool and a surrounding medium comprise a support member, a radiating/receiving element disposed on one surface of a nonconductive dielectric material having a shape compatible with the shape and dimensions of the support member, a ground plane disposed on the other face of the dielectric opposite the radiating/receiving element and a predetermined distance therefrom, and impedance means, a short circuit in one embodiment, electrically connecting an end of the first element to the second element. The dielectric, radiating/receiving element, and ground plane are carried by the support member, which may be a mandrel or a pad. Various embodiments particularly suitable for use in certain applications and with certain kinds of logging tools are described. Furthermore, related methods for communicating electromagnetic energy between a logging tool and a surrounding medium and related logging tools for investigating the electrical permittivity and/or electrical conductivity of a formation traversed by a borehole are described.
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