Design of asymmetrical RF and microwave bandpass filters by computer optimization

Budimir, Djuradj and Goussetis, George (2003) Design of asymmetrical RF and microwave bandpass filters by computer optimization. IEEE Transactions on Microwave Theory and Techniques, 51 (4, par). pp. 1174-1178. ISSN 0018-9480


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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.

Item Type: Article
Uncontrolled Keywords: CAD, Chebyshev filters, UHF filters, band-pass filters, electrical engineering computing, microwave filters, optimisation, passive filters, ridge waveguides, waveguide filters, Chebyshev criterion, Chebyshev function prototypes, asymmetrical RF bandpass filters, circuit simulation, computer optimization, design procedure, discontinuities, fringing, junctions, microwave bandpass filters, minimax criterion, rectangular waveguide, ridged waveguide filters
Subjects: University of Westminster > Science and Technology > Electronics and Computer Science, School of (No longer in use)
Depositing User: Miss Nina Watts
Date Deposited: 13 Feb 2007
Last Modified: 11 Aug 2010 14:31

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