Active Huygens' Cloaks for Arbitrary Metallic Polygonal Cylinders

Active interior electromagnetic cloaking utilizes an array of radiating sources, positioned along an object's surface, to create a field discontinuity which cancels out electromagnetic scattering. While this method has been successfully implemented on circular cylinders, which scatter uniformly, a practical cloak must be capable of hiding non-uniform objects where scattering is dependent on incident direction. This work seeks to demonstrate this through the design of a 20-element array capable of cloaking a five-sided polygonal target. The effectiveness of the cloak, when illuminated by a plane wave at 0° and 30° incidence, is then verified through fullwave simulations. By adjusting the weights of each element, the radar cross-section (RCS) of the object can be reduced by up to 20-25 dBsm regardless of the incidence angle. RCS reduction is less prevalent at corners due to edge effects but cloak effectiveness is not significantly affected.