Advances in modern radar systems include specialized active antennas, microwave circuits and devices, agile beam steering and shape, and digital space-time signal processing. While the pace of radar technology continues to march forward, two fundamentals remain constant. The first is that the electromagnetic properties of antennas, radomes, and the installation platform are governed by the underlying and unwavering physics.By Lawrence Williams, PhD., Director Product Management, Matthew Commens, PhD., Product Manager, HFSS, and Steve Rousselle, Technical Director, ANSYS, Inc.