Split rings resonators: key particles for microwave device design

In this paper, it is demonstrated that split rings resonators (SRRs) and complementary split rings resonators (CSRRs) are very suitable particles for the design and optimization of microwave devices. Properly coupled to planar transmission lines, they allow for the synthesis of planar microwave filters and other microwave devices. Several examples are provided to demonstrate the potentiality of such resonators. The design of compact devices, based on the small electrical size of SRRs and CSRRs, as well as the elimination of undesired frequencies (spurious) are the foremost applications of these resonators.