Compact bandpass filters based on linked hexagonal‐omega resonators

Abstract

A novel compact bandpass filter based on linked hexagonal‐omega resonators (LHORs) is presented. The proposed filter is realized by loading the LHORs to the microstrip line on the top of the substrate. The LHORs provides the possibility of designing bandpass filters with small size and simple structure. Two prototypes of filters were designed based on this structure. To validate the proposed prototypes, two‐cascaded and three‐cascaded bandpass filters using LHORs are simulated and fabricated. The proposed filters show a good pass‐band performance and a high out‐band suppression. The good agreement between the measured and the simulated results proves the excellent performance of the proposed filters. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1049–1052, 2016