DocumentCode :
1177874
Title :
Design of asymmetrical RF and microwave bandpass filters by computer optimization
Author :
Budimir, Djuradj ; Goussetis, George
Author_Institution :
Wireless Commun. Res. Group, Univ. of Westminster, London, UK
Volume :
51
Issue :
4
fYear :
2003
fDate :
4/1/2003 12:00:00 AM
Firstpage :
1174
Lastpage :
1178
Abstract :
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.
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; Band pass filters; Chebyshev approximation; Circuit simulation; Design optimization; Microwave filters; Minimax techniques; Passband; Prototypes; Radio frequency; Sampling methods;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2003.809623
Filename :
1193127
Link To Document :
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