Design Techniques for Asymmetric Dual-Passband Filters

Abstract

This paper presents a novel synthesis method for asymmetric dual-passband microwave filters. The proposed method employs frequency transformation technique to determine the locations of poles and zeros of a desired filter. This method can be used to design dual-passband filters with prescribed passbands directly without any need of optimization process. Then an eight-pole asymmetric dual-passband filter is designed efficiently to validate the transformation technique. This universal method will be useful for the design of various high performance microwave dual-passband filters in the communication systems.