Glide Symmetry Applied to the Design of Common-Mode Rejection Filters Based on Complementary Split-Ring Resonators

In this brief, glide symmetry is applied to design common-mode rejection filters based on defected ground structures with bandstop response. To this aim, complementary split-ring resonators are chosen as the basic components for common-mode rejection. To illustrate the advantages of using glide symmetry, three implementations are studied and compared. The results reveal that glide symmetry offers the best performance in terms of common-mode rejection level and fractional bandwidth. Furthermore, glide symmetry barely affects the integrity of the differential mode. A prototype of each of the considered symmetries has been designed, simulated, and tested for practical validation. Good agreement is observed between the simulated and measured results, experimentally demonstrating the advantages of glide symmetry.

Automated summary

In this article, glide symmetry is utilized for the design of common-mode rejection filters based on defected ground structures. Complementary split-ring resonators are chosen as the basic components to achieve common-mode rejection. Three implementations are studied and compared to demonstrate the advantages of glide symmetry. The results show that glide symmetry offers the highest common-mode rejection level and fractional bandwidth, while barely affecting the integrity of the differential mode. Prototype designs have been simulated and tested, confirming the advantages of glide symmetry.