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In this paper, we consider very high concentration of electric field inbetween infinitely many circular perfect conductors arranged closely in tworows. In stiff fiber-reinforced composite, shear stress concentrations occur inbetween neighboring fibers, and the electric field means shear stress in thispaper. Due to material failure of composites, there have been intensive studiesso far to estimate the field in between only a finite number of inclusions.Indeed, fiber reinforced composites contain a large number of stiff fibers, andthe concentration can be strongly enhanced by some combination of inclusions.Thus, we establish some asymptotes and optimal blow-up rates for the field innarrow regions in between infinitely many conductors in two rows to describethe horizontally and vertically combined effects of a large number of ones.Especially, one of the blow-up rates is substantially different from theexisting result in the case of finite inclusions.

Two types of electric field enhancements by infinitely many circular conductors arranged closely in two parallel line