Resonance Properties of Metallic Ring Systems: More Complex Structures

Abstract

When we developed the mode-expansion theory in the last chapter, we have assumed that the metal wire forming the ring possesses a circular cross-section and the system contains only one metallic ring. However, in reality, the metallic wires often exhibit flat rectangular cross-sections, and the SRRs fabricated or proposed often have two (or more) metallic rings, which are either lying on the same plane coupled horizontally (denoted as coplanar double-ring SRR) or lying on different planes coupled vertically (denoted as broadside-coupled (BC) SRR) . Typically, the small gaps are opened at opposite positions on two rings in these double-ring systems, as shown in Fig. 3.1. Why did such double-ring systems draw intensive attention?