volume | PIER Journals

2009-04-14

Tunable Lowpass Filters Using Folded Slots Etched in the Ground Plane

Gharbi Ramzi,

Mr. Gharbi Ramzi

Dep. Of Physics

Faculty of Sciences of Tunis

Tunisia

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Hassen Zairi,

Professor Hassen Zairi

National Engineering School of Carthage

University of Carthage

Tunisia

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Hichem Trabelsi,

Dr. Hichem Trabelsi

Department de Physique

Laboratoire d'Electronique

Tunisie

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Henri Baudrand

Dr. Henri Baudrand

Department of Physics

Electronics Laboratory

Tunisia

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Progress In Electromagnetics Research C, Vol. 7, 65-78, 2009

doi:10.2528/PIERC09012706

Abstract

This paper presents a new concept to implement tunable lowpass filters by employing slot resonators etched in the ground plane. The tenability is achieved with the use of switches with varactor diodes attached across the slots on the ground. The concept is demonstrated by considering 10-slots lowpass and 4-slots low pass filters. The Microstrip lines with a folded slot etched in the ground plane structure are modelled in multilayered media. To analyze this type of structure an iterative method based on the concept of waves is developed and adapted to determine features of very high frequency's electronic circuits in a planar wave guide. The analysis takes into account eventual coupling parasites. Experimental measurements are performed to validate the computation. The approach involves the mixed magnetic and electric filed equation technique and the wave concept iterative process which involves S-parameters extraction technique. In this sense, a program in FORTRAN has been elaborated to determine different parameters S_ij characterizing the studied structure.

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Gharbi Ramzi, Hassen Zairi, Hichem Trabelsi, and Henri Baudrand, "Tunable Lowpass Filters Using Folded Slots Etched in the Ground Plane," Progress In Electromagnetics Research C, Vol. 7, 65-78, 2009.
doi:10.2528/PIERC09012706

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