A Novel Method for the Design and Optimization of Microstrip Multi-section Bandpass Combline Filters

Author

Oraizi, Homayoon ; Azadi-Tinat, Nima

Author_Institution

Iran Univ. of Sci. & Technol., Tehran

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

1217

Lastpage

1220

Abstract

A novel least square based method is developed for the microstrip multi-section bandpass combline filter. First, the overall transmission matrix of the filter is obtained in terms of its various geometrical dimensions. The effects of couplings among adjacent and nonadjacent coupled conducting strips and also the dispersion relations of coupled lines on microstrips are considered. Then, the filter scattering parameters and its insertion loss is determined. Subsequently, an error function is constructed based on the optimization of specified insertion losses in the passband, transition bands and stopbands. The performance of the proposed least square method for the combline filter design and optimization is verified by the available electromagnetic software packages, which highlights its several advantages (such as simultaneous input and output impedance matching) compared with the available design procedures

Keywords

S-parameters; band-pass filters; comb filters; least squares approximations; microstrip filters; optimisation; error function; filter scattering parameters; impedance matching; insertion loss; least square based method; microstrip multisection bandpass combline filters; passband; stopbands; transition bands; transmission matrix; Band pass filters; Couplings; Design methodology; Design optimization; Dispersion; Insertion loss; Least squares methods; Microstrip filters; Strips; Transmission line matrix methods; CAD; Combline filters; filter design; impedance matching; optimization;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281196

Filename

4058047