MULTIPLE ORDER DUAL-BAND ACTIVE RING FILTERS WITH COMPOSITE RIGHT/LEFT-HANDED CELLS

Abstract

In this paper, a novel dual-band active filter topology is presented. The non-linear phase response of a composite right/lefthanded cell is used to achieve the desired dual-band performance. Additionally, the proposed structure based on coupled ring resonators yields a very compact solution in which high-order implementations can be easily obtained by cascading multiple rings. The theoretical principles of this type of filters are analyzed in detail. Finally, three prototypes based on first-, second-and third-order structures validate the feasibility of this type of filters. Good agreement between simulations and measurements has been achieved.