New Method for Transformation of Microstrip Lowpass Filter to Compact Bandpass Filter Using Defected Ground Structure(DGS) Coupled Resonators

Author

Boutejdar, A. ; Elsherbiny, A. ; Omar, A.S.

Author_Institution

Dept. of Microwave & Commun. Eng., Magdeburg Univ.

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

279

Lastpage

282

Abstract

In this letter, bandpass filter development with the assistance of the multi-layer transformation method, on the basis of the known Chebyschev-lowpass filter, is presented Boutejdar (2005). A new compact microstrip bandpass filter using three coupled arrowhead-slots in bottom-layer and a discontinuous 50Omega-microstrip transmission line in top-layer is proposed Boutejdar (2005). Both microstrip lines are coupled by means of a J-immitance inverter. If the width of the gap is changed, the center frequency would shift to the left or to right within a certain frequency range, and we can easily realize a tunable BPF. Three-pole-Chebyschev bandpass filter is fabricated, and tested at 7.25GHz

Keywords

Chebyshev filters; band-pass filters; low-pass filters; microstrip lines; microwave filters; resonator filters; 50 ohm; 7.25 GHz; Chebyschev-lowpass filter; J-immitance inverter; compact bandpass filter; coupled arrowhead-slots; coupled resonators; defected ground structure; microstrip lowpass filter; microstrip transmission line; multilayer transformation; Band pass filters; Couplings; Frequency; Inverters; Microstrip filters; Microstrip resonators; Resonator filters; Testing; Transmission line discontinuities; Transmission lines;

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.2006.281292

Filename

4057803