Design of triple-passband microwave filters using frequency Transformations

Juseop Lee; Kamal Sarabandi

doi:10.1109/TMTT.2007.912206

Design of triple-passband microwave filters using frequency Transformations

Juseop Lee, Kamal Sarabandi

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

This paper introduces a synthesis method for triplepassband microwave filters. A frequency transformation is developed for finding the locations of poles and zeros of the triple-passband filter. The poles and zeros obtained as such are optimized to achieve a transfer function with a reduced number of transmission zeros in order to reduce the number of cross-couplings. Sixand 12-pole triple-passband filters are synthesized for validation of this proposed method. A 12-pole triple-passband filter is fabricated with a microstripline structure and shown to provide good agreement between synthesis and measurement results. Finally, the frequency transformation for asymmetric triple-passband filters is briefly discussed.

Original language	English
Pages (from-to)	187-193
Number of pages	7
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	56
Issue number	1
DOIs	https://doi.org/10.1109/TMTT.2007.912206
Publication status	Published - 2008 Jan
Externally published	Yes

Keywords

Circuit synthesis
Microwave filters
Triple-passband filters

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

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AB - This paper introduces a synthesis method for triplepassband microwave filters. A frequency transformation is developed for finding the locations of poles and zeros of the triple-passband filter. The poles and zeros obtained as such are optimized to achieve a transfer function with a reduced number of transmission zeros in order to reduce the number of cross-couplings. Sixand 12-pole triple-passband filters are synthesized for validation of this proposed method. A 12-pole triple-passband filter is fabricated with a microstripline structure and shown to provide good agreement between synthesis and measurement results. Finally, the frequency transformation for asymmetric triple-passband filters is briefly discussed.

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