Properties of Composite Magnetic Components for Use With HEMAC.

摘要

Hybrid electromagnetic antenna couplers (HEMAC) offer the advantage of using convenient parts of the environment as antennas. In this report the synthesis and evaluation of flexible, shock-resistant, magnetic composites for use at high frequency in HEMAC coils and their characterization are described. Ferrites and carbonyl iron were cast into desired form using silicone as a matrix material. The complex impedance of the samples in the form of a coaxial line was measured from 1-100 MHz. The characteristic impedance, resistance, reactance, complex permeability and complex permittivity, and losses were computed. The real part of the permeability for all materials was found to be equal to the reciprocal of the cube of the porosity up to 100 MHz, where p is the porosity. An experimental toroid mounted in a HEMAC on a simulated rifle exhibited improved characteristics. (Author)