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Abstract
A class of band-pass filters using E-shape resonators is proposed in this paper. The transmission and reflection property of the E-shaped resonators are analyzed with the transmission line theory. In order to verify the E-shaped resonators circuit structure and its corresponding filter design theory, the single, two-, and three-cascaded band-pass filters using E-shaped resonators are designed and simulated. The resonant characteristics of the cascaded band-pass filters show their advantages of compact size, excellent pass-band performance, and high out-band suppression. Finally, the two- and three-cascaded band-pass filters are fabricated and measured. The measured results show excellent band-pass filtering property and low insertion loss. The measured results also prove to be generally consistent with the simulated results.
Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant 61171051. The authors would like to thank D.N. Cui, Beijing University of Posts and Telecommunications, for her technical assistance.