Design of asymmetrical RF and microwave bandpass filters by computer optimization

D. Budimir, George Goussetis

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


This paper presents an optimization-based approach to the design of asymmetrical filter structures having the maximum number of return- or insertion-loss ripples in the passband such as those based upon Chebyshev function prototypes. The proposed approach. has the following advantages over the general purpose optimization techniques adopted previously such as: less frequency sampling is required, optimization is carried out with respect to the Chebyshev (or minimax) criterion, the problem of local minima does not arise, and optimization is usually only required for the passband. When implemented around an accurate circuit simulation, the method can be used to include all the effects of discontinuities, junctions, fringing, etc. to reduce the amount of tuning required in the final filter. The design of asymmetrical ridged-waveguide bandpass filters is considered as an example. Measurements on a fabricated filter confirm the accuracy of the design procedure.
Original languageEnglish
Pages (from-to)1174-1178
Number of pages5
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number4 I
Publication statusPublished - Apr 2003

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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