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

Homepage

Hassen Zairi,

Professor Hassen Zairi

National Engineering School of Carthage

University of Carthage

Tunisia

Homepage

Hichem Trabelsi,

Dr. Hichem Trabelsi

Department de Physique

Laboratoire d'Electronique

Tunisie

Homepage

Henri Baudrand

Dr. Henri Baudrand

Department of Physics

Electronics Laboratory

Tunisia

Homepage

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

doi:10.2528/PIERC09012706 | Google Scholar

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.

Download Full Article (286) View Full Article volume

Citation

Copy Export

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

References

1. Gharsallah, A., R. Garcia, A. Gharbi, and H. Baudrand, "Wave concept iterative merges with model fast Fourier transformation to analyze micro-strip filters," Applied Computed Electromagnetic Society, Vol. 14, No. 1, 61-67, March 2001. Google Scholar

2. Hong, J. S. and M. J. Lancaster, "Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies ," IEEE Transactions on Microwave Theory and Techniques, Vol. 48, No. 7, 1098-1107, July 2000.
doi:10.1109/22.848492 Google Scholar

3. Gharsallah, A., A. Gharbi, L. Desclos, and H. Baudrand, "Analysis of interdigital capacitor and quasi-lumped miniaturized filters using iterative method," Int. Journal of Numerical Modeling: Electronic Networks, Devices and Fields, Vol. 15, 169-179, 2002.
doi:10.1002/jnm.448 Google Scholar

4. Gharsallah, A., A. Gharbi, and H. Baudrand, "Efficient analysis of multiport passive circuitsusing the iterative technique," Electromagnetics, Vol. 21, 73-84, 2001.
doi:10.1080/02726340151087996 Google Scholar

5. Trabelsi, H., A. Gharsallah, and H. Baudrand, "Analysis of microwave circuits including lumped elements based on iterative method," International Journal of RF and Microwave Computer-aided Engineering, Vol. 13, No. 4, 269-275, 2003.
doi:10.1002/mmce.10084 Google Scholar

6. Edwin, K., L. Young, J. C. Beal, and Y. M. M. Antar, "Multilayer microstrip structure analysis with matched load simulation," IEEE Transactions on Microwave Theory and Techniques, Vol. 43, No. 1, January 1995. Google Scholar

7. Kaddour, M., A. Mami, A. Gharsallah, A. Gharbi, and H. Baudrand, "Analysis of multilayer microstrip antennas by using iterative method," Journal of Microwaves and Optoelectronics, Vol. 3, No. 1, April 2003. Google Scholar

8. Zhang, R. and R. R. Mansour, "A novel lowpass microstrip filter using metal-loaded slots in the ground plane," IEEE MTT-S. Microwave Symp. Dig., 1311-1314, June 2004. Google Scholar

9. Li, M., L. Haiwen, A. Boutejdar, W. Shuxin, and F. Tong, "Novel microstrip bandpass filter with slotted hexagonal resonators and capacitive loading," Proc. 38th European Microwave Conference 2008 (EuMC), Amsterdam RAI, Amsterdam, The Netherlands, October 27-31, 2008. Google Scholar