A Synthesis Method for Dual-Passband Microwave Filters

This paper describes a synthesis method for symmetric dual-passband microwave filters. The proposed method employs frequency transformation techniques for finding the locations of poles and zeros of a desired filter. This method can be used to design dual-passband filters with prescribed passbands a...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2007-06, Vol.55 (6), p.1163-1170
Main Authors: Juseop Lee, Sarabandi, K.
Format: Article
Language:English
Subjects:
Applied sciences
Asymmetry
Attenuation
Circuit properties
Circuit synthesis
Design optimization
dual-passband filters
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Flexibility
Frequency
Frequency filters
Low pass filters
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Microwave theory and techniques
Microwaves
Passband
Poles and zeros
Prototypes
Stripline
Striplines
Synthesis
Theoretical study. Circuits analysis and design
Transformations
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Summary:This paper describes a synthesis method for symmetric dual-passband microwave filters. The proposed method employs frequency transformation techniques for finding the locations of poles and zeros of a desired filter. This method can be used to design dual-passband filters with prescribed passbands and attenuation at stopbands directly without the need for any optimization processes. To validate the procedure a dual-passband stripline filter is designed and fabricated. The stripline dual-passband filter is designed with passbands at 3.90-3.95 and 4.05-4.10 GHz, and 30-dB attenuation at the stopband. This measured results show a good agreement with the theoretical ones. The frequency transformation for symmetric dual-passband filters is also extended to include asymmetric dual-passband responses. This flexible frequency transformation preserves the attenuation characteristics of the low-pass filter prototype. Examples are shown to discuss the flexibility of this transformation.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2007.897712