the nomenclature these are two rectangular square D type configurations, exactly the same size, lying flat, side by side, in the unit cell. Also these are not concentric. One set of cited dimensions are 2 mm on the shorter side, and 3.12 mm on the longer side. The gaps in each ring face each other, in the unit cell. The Omega Structure, as the nomenclature describes, has an Ω-shaped ring structure. There are two of these, standing vertical, side by side, instead of lying flat, in the unit cell. In 2005 these were considered to be a new type of metamaterial. One set of cited dimensions are annular parameters of R=1.4 mm and r=1 mm, and the straight edge is 3.33 mm. Another new metamaterial in 2005 was a coupled “S” shaped structure. There are two vertical "S" shaped structures, side by side, in a unit cell. There is no gap as in the ring structure, however there is a space between the top and middle parts of the S and space between the middle part and bottom part of the S. Furthermore, it still has the properties of having an electric plasma frequency and a magnetic resonant frequency. Other types of split-ring resonators are the spiral resonator with 8 loops. broadside coupled split-ring resonator (BC-SRR). Two-layer multi spiral resonator (TL-MSR), the broad-side coupled spiral resonator with four turns, the complementary split ring resonator, the open split-ring resonator (OSRR), and the open complementary split-ring resonator (OCSRR). Transmission line configurations include SRR-based CRLH (composite right-left-handed) transmission line and its equivalent complement. Split ring resonator research On May 1, 2000 conducting wires were placed symmetrically within each cell of a periodic split-ring resonator array which achieved negative propagation of electromagnetic waves in the microwave region. The concept was and still is used to build interacting elements smaller than the applied electromagnetic radiation. In addition, the spacing between, referred to as the lattice constant, is also smaller than the applied radiation. Additionally, the splits in the ring allow the SRR unit to achieve resonance at wavelengths much larger than the diameter of the ring. The unit is designed to generate a large capacitance, lower the resonant frequency, and concentrate the electric field. Combining units creates a design as a periodic medium. Furthermore, the multiple unit structure has strong magnetic coupling with low radiative losses. Research has also covered variations in magnetic resonances for