Sea Technology

NOV 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Simulating System Performance With Engineering Technology Boosting Communications Through Integrated Topside By Dr. Junho Lee • Dr. Mengqing Yuan • Dr. Bo Zhao R ecent, cutting-edge computer-aided engineering (CAE) and electronic design automation (EDA) technologies focus on system-level simulations of game-changing technologies. A reliable system-level simulation of the overall system performance can reduce cost and increase effciency when upgrading modern communications systems. It will also dramatically reduce the risk of integration failure by accurately predicting a malfunction or severe design error on the computer screen instead of expensive physical measurements. A U.S. Navy program called Integrated Topside aims to take all of the little bolt-ons and antennas used for communications, basic radar functions and electronic warfare and combine them as one unifed architecture. This could help improve ships' antiradar profles, increase communications bandwidth, and resolve electromagnetic interference and compatibility issues between different devices. Newgeneration active electronically scanned array (AESA) radars have already demonstrated communications and electronic jamming potential, and current research is focused on that technology as the way forward. Understanding the Challenge One of the critical challenges that must be conquered to meet the above objectives is to resolve the mutual coupling between transmitters and receivers. Mutual coupling between two antennas lowers isolation and damages the radio frequency (RF) system performance when one transmits (T) and the other receives (R). Modeling and simulation tools are needed to determine whether the mutual coupling between antenna elements, which complicates antenna matching in array architectures, can be weakened substantially when electric (E-transmitter) and magnetic (Breceiver) feld antenna elements are mixed together and are operating concurrently in near felds. The other key element is a novel technology called superconducting quantum inter- ference device (SQUID). An array of such SQUIDs forms a superconducting quantum interference flter (SQIF), which has been found in research labs to be extremely sensitive to magnetic fux and, hence, has great potential to be designed as a new class of B-feld sensors or receiving antennas. The modeling and design automation tools for such a novel device have been researched for quite a while. However, the technologies have not been organized as a complete solution deliverable to the front designer. Creating a Solution Wave Computation Technologies (WCT), based in Durham, North Carolina, was funded by the U.S. Navy's Small Business Technology Transfer STTR program to develop modeling and simulation technologies and integrate all components as a complete solution. The major research and development efforts focus on developing software that will enable antenna engineers to design SQUID/SQIF in a full-wave environment. Numerous Department of Defense applications A typical multiscale problem. www.sea-technology.com November 2013 / st 13

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