Simulation of Low Frequency (< 2 GHz) EMI and Coupling in Shipboard Environments

This Phase I effort will develop accurate and numerically efficient Computational EM techniques for analyzing direct and indirect coupling problems in topside environment, and estimating co-site interference problems in this environment in the VHF toL-band range. We propose two new lines of attack in this effort. First, we will develop novel approaches that would substantially extend the range of applicability of the existing CEM tools, enabling them to be scaled to much larger problems than is currently possible.Second, we propose to develop new methods for hybridizing the MoM with the FDTD, that would take advantage of the salutary features, complement the ranges of applicability of the two (PEC vs. non-PEC structures), and dovetail them in a seamless manner. Ourfirst step would be to develop codes that can predict the performance of antennas of various types operating in the 30 MHz to 2 GHz range and in a complex topside environment, which may either be PEC or non-PEC materials, e.g., absorbers, composites, andcombinations thereof. Subsequently, we will extend these capabilities of these codes so that they can simulate the problem of coupling between two radiators that are designed to operate at two different frequencies, in general. Anticipated developments of the novel CEM tools would be of immediate use to several other projects of interest to various DoD agencies, especially the Navy, in connection with EMI analysis of proposed or existing designs, for which no accurate tools arecurrently available. Commercial organizations, such as government contractors, would also benefit from such tools that would certainly find a plethora of applications in EMI, EMC, RADHAZ, Non-lethal weapon and Security-type problems. RMA has beendeveloping and marketing special-purpose CEM codes for more than 25 years, with a customer base comprising of DoD agencies and their contractors, and commercial code developers in the areas of antennas, MMIC, RFIC and Wireless circuits. RMA is currentlyoffering several CEM codes to DoD contractors for RCS computation, EMI/EMC modeling and antenna design.