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Self-Orienting Micro-Antenna

IP.com Disclosure Number: IPCOM000047289D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+2]

Abstract

Metal-coated graphite whiskers with high strength-to-weight ratios appropriate for self-oriented antenna use (where the torque of the electric field moves the antenna to optimum position) may be produced economically on a continuous roller whisker growing system. Very robust plated graphite antennae of optical and infrared wavelengths can be grown with accurate control of length and with diameters as small as 15 nm. With a whisker in use as an antenna, the dipole moment induced in a whisker by the electric vector of polarized electromagnetic waves reacts with that electric field to produce a torque tending to align the whisker with the electric vector of the polarized electromagnetic wave.

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Self-Orienting Micro-Antenna

Metal-coated graphite whiskers with high strength-to-weight ratios appropriate for self-oriented antenna use (where the torque of the electric field moves the antenna to optimum position) may be produced economically on a continuous roller whisker growing system. Very robust plated graphite antennae of optical and infrared wavelengths can be grown with accurate control of length and with diameters as small as 15 nm. With a whisker in use as an antenna, the dipole moment induced in a whisker by the electric vector of polarized electromagnetic waves reacts with that electric field to produce a torque tending to align the whisker with the electric vector of the polarized electromagnetic wave. Most practical antennae rods have such large moments of inertia that this effect is not useful in aligning the rods to make them efficient antennae for electromagnetic waves of intensities that may be encountered. For the self-orientation effect to succeed, the antennae should be as low in mass as practical in view of requirements that they also be mechanically, thermally and chemically stable and affordable in large quantities. This process is a low cost method of producing large quantities of metal-coated graphite whiskers, on the order of 15 nm in diameter, with lengths accurately predetermined in the range required. Whiskers, in general, have mechanical properties approaching the theoretical limit for any given material. The strength-to-weight r...