High power ultra wideband radar exotic material response

This paper is the first of two that present analytical and numerical analysis of high power and ultra wide band radars interacting with EMI and radar suppression materials. Magnetic materials are often used in isolators, thin film EMI materials and/or appliques. Such magnetic composites may be exposed to wide band and/or high power signals in operational radar systems. We describe exotic interactions where material responses derive from wideband and/or high power non linearity. The responses are similar to recent publications that find changes in the magnetization spectra (proportional to material permeability) that may occur when a device and/or material is exposed to high power pulsed or pulsed-CW RF (radio frequency) sources. Numerical simulations are used to study response of micro and nano scale magnetic particles within composites. Synthesis and testing of devices and materials containing nanoscale (10s of nanometer size) magnetic particulates is a major thrust in device improvements. Nonlinear response is studied as a function of material intrinsic magnetic properties, radar ERP, power spectrum of the incident RF field, particle geometry (shape and size) of the magnetic material and uniformity in shape and size.