Gain Incorporated Split-Ring Resonator Structures for Active Metamaterials

Figure 6

Active SRR incorporating gain elements. (a) Conceptual design employing a circulator to incorporate a gain element with a single SRR ring. Top: a circuit board realization of the circulator and amplifier circuit. (b) Effective permeability of ideal active SRR with the incorporated gain modeled as negative resistance. Solid curve: the real part of the effective relative permeability. Dashed curve: the imaginary part.

(a)

(b)