The present paper establishes characteristics of the relative magnetic permeability spectrum μ(f) of magnetic materials at microwave frequencies. The integral ∫ ∞ 0 . ). ( ' ' df f f μ of the imaginary part of μ(f) multiplied with the frequency f gives remarkable properties. A generalisation of Snoek’s law consists in this quantity being bounded by the square of the saturation magnetization mul...

This paper investigates the reduction of backscatter radar cross section (RCS) for a rectangular cavity embedded in the ground plane. The bottom of the cavity is coated by a thin, multilayered radar absorbing material (RAM) with possibly different permittivities. The objective is to minimize the backscatter RCS by the incidence of a plane wave over a single or a set of incident angles. By formu...

The reduction of backscatter radar cross section(RCS) in TE polarization for a rectangular cavity embedded in the ground plane is investigated in this paper. It is established by placing a thin, multilayered radar absorbing material(RAM) with possibly different permittivities at the bottom of the cavity. A minimization problem with respect to the backscatter RCS is formulated to determine the s...

The complex electrical permittivity and magnetic permeability of composite materials made a polymer binder filled with micron-scale carbonyl iron powder (CIP) are measured between 0.1 39 GHz. Permeability is in overlapping frequency subbands using two different techniques: free-space method from 3 to GHz coaxial impedance cell 5 dependence on filler concentration studied for composites based ph...