Optimizing folded dipole array with quick smith chart manipulations giving broadband absorption surface and optional two-way communication

Radar absorbing surfaces with excellent 100% bandwidth have been made possible lately with square loops of resistive strip. However, a setup with such absorbing surface may still need an extra antenna to maintain outside communication and this could be cumbersome. If such broadband absorbing surface is made of an array of actual antennas, and one or a few of them can be tapped for outside communication when needed, then the extra antenna is not needed. This paper shows that indeed an array of folded-dipoles, forming square loops, can be designed for such purpose and bandwidth through optimization. The optimization is actually quite simple, by manual manipulations of the impedance locus in Smith chart.