Microstrip extracted-pole lossy filters

Zhou Zhou, Jiasheng Hong

Research output: Chapter in Book/Report/Conference proceedingChapter


In the chapter, the design of microstrip lossy extracted-pole filters has been described. This type of filter can have both of high selectivity and flat passband. The high selectivity is contributed by using extracted-pole technique and the flat passband is achieved by introducing RCCs in the inline network. The independently controllable extracted-pole transmission zeros result in an inline asymmetrical filter topology with asynchronously tuned resonators. The direct circuit synthesis of this type of filter has been described with numerous examples providing a more direct insight into the theory. The proposed equivalent circuit and tabulated elements are ready to hand with most commercially available circuit modelling tools. Two six-pole microstrip filters of this type have been designed and demonstrated experimentally showing promising filtering characteristics. The improvement of passband flatness is more significant and obvious in the narrowband than that of the wideband.

Original languageEnglish
Title of host publicationAdvances in Planar Filters Design
PublisherInstitution of Engineering and Technology
Number of pages28
ISBN (Electronic)9781785615894
Publication statusPublished - 2019

ASJC Scopus subject areas

  • General Engineering


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