Electronics360: "Attacking radar: The evolving science of electronic warfare"

Thanks for this article. Would like to point out that Tightly Coupled Array Antenna (TCAA) does not refer to coupling two sides of the antenna intentionally to achieve higher bandwidth. TCAA is typically a planar array of radiating elements that are spaced less than half-wavelength at the highest frequency, thereby resulting in strong mutual coupling between all elements over the entire frequency band of interest. And it is due to the strong mutual coupling that caused wide bandwidth to be achieved. I had the privilege to learn this technique from the late Professor Ben Munk (of Ohio State University), and had actually designed and built a small dual-polarized 2D array using very short Vivaldi elements about 25-27 years ago. It really works!