An Improvement of Defected Ground Structure Lowpass/Bandpass Filters Using H-Slot Resonators and Coupling Matrix Method

Ahmed Boutejdar, Abbas Omar, Edmund P. Burte, Reinhar Mikuta


A novel compact wideband high-rejection lowpass filter (LPF) using H-DGS is presented. The proposed filter has neither open stub nor cascaded high-low impedance elements. It consists of two coupled H-slots in the ground plane along with a compensated line. The effect of the new slot on the filter performance is examined. The comparison with the conventional filters shows that the proposed one guarantees a large rejected-band of 20dB from 2.5 to 16 GHz. Experimental measurements by means of HP8719D network analyzer agree well with simulated results which are carried out by Microwave Office. Based on H-DGS LPF Structure, a novel bandpass filter (BPF) will be is designed and tested verified by using both J-inverter and coupling matrix methods.

Full Text:



D. Ahn,J. Park, C. Kim, J.Kim, J. Park, Y. Qian, and T. Itoh, "A design of the low-pass filter using the novel microstrip defected ground structure,`` IEEE Trans. Microw. Theory Tech., vol. 49, pp. 86 - 93, Jan. 2001.

N. C. Karmakar and M. N. Mollah, "Investigations into nonuniform photonic bandgap microstripline low-pass filters,`` IEEE Trans. Microw. Theory Tech., vol. 51, no. 2, pp. 564–572, Feb. 2003.

A. Abdel-Rahman, A. K. Verma, A. Boutejdar, and A. S. Omar, "Control of bandstop response of Hi-Lo microstrip lowpass filter using slot in ground plane,`` IEEE Trans. Microw. Theory Tech., vol.52, pp. 1008 – 1013, Mar. 2004.

J.-S. Lim, C.-S. Kim, Y.-T. Lee, D. Ahn and Nam, "Design of lowpass filters using defected ground structure and compensated microstrip line,`` Electron. Lett., vol. 38, no. 22, pp. 1357-1358, October 2002.

Q. Xue, K. M. Shum and C. H. Chan, "Novel 1-D microstrip PBG cells,`` IEEE Microw. Wireless Compon. Lett., vol. 10, no. 10, pp. 403-405, October 2000.

Ahmed Boutejdar, Adel Elsherbini and A. S. Omar, "A Compact Microstrip Multi-Layer Lowpass Filter Using Triangle Slots Etched in the Ground Plane,`` in Proc. 36th Eur. Microw. Conf., (EuMC), Manchester, UK, September 2006

A. Boutejdar, A.Ramadan, M. Makkey and A. S. Omar, ``Design of Compact Microstrip Lowpass filter Based on Novel U-Resonator Using Defected Ground Structure and Compensated Microstrip Line,`` in Proc. 36th Eur. Microw. Conf., (EuMC), Manchester, Manchester, UK, September 2006, pp. 267-270,

C. S. Kim, J. S. Park, A. Dal, and J. Kim, "A novel 1-D periodic defected ground structure for planar circuits,`` IEEE Microw. Guided Wave Lett., vol. 10, pp. 131–133, Apr. 2000.

L. Garde, M. J. Yabar, and C. D. Rio, "Simple modeling of DGS to design 1D-PBG low pass filter,`` Microw. Opt Technol. Lett., vol. 37, no. 3, pp. 228–232, May 2003.

J.-S. Hong, and M. J. Lancaster, "Microstrip Filters for RF/Microwave Applications,`` Wiley, New York, 2001.

Ahmed Boutejdar, Smain Amari and Abass Omar, "A novel compact J-admittance inverter-coupled microstrip bandpass filter using arrowhead-shape as defected ground structure,`` Microw. Opt Technol. Lett, vol 52, no. 1, pp. 34–38, Jan. 2010.

D.M. Pozar, "Microwave engineering,`` second edition, John-Wiley & Sons, 1998.

A. Boutejdar, M. Challal, A. Omar, E. Burte, R. Mikuta and A. Azrar; A Novel Band-Stop Filter Using Octagonal- Shaped Patterned Ground Structures along with Interdigital and Compensated Capacitors; ACES Journal - The Applied Computational Electromagnetics, Issue: Volume 26, number 10, July 2011.

A. Boutejdar, A. S. Omar, M. Senst, A. Batmanov and E. Burte and R. Mikuta; A NewDesign of a Tunable WLAN-Band Pass Filter Using a Combination of Varactor Device, RF-Choke and Hairpin-Slottet Ground Structure (SGS); Proc. 41th European Microwave Conference, EuMC 2011 (Manchester, UK), October 2011

Ahmed Boutejdar, Abbas Omar, E. P. Burte and R. Mikuta, Design of Compact Ultra-Wide Stopband Lowpass Filter Using a USlotted Ground Structure (SGS) and Multilayer-Technique, Recent Patents on Electrical Engineering journal, Bentham Science Publishers, Volume 4, Number 2, pp: 120-126, Mai 2011.

A. Boutejdar, A. Omar, E. P. Burte, R. Mikuta, A. Batmanov;

Ahmed Boutejdar, Omar Abbas and Burte P. Edmund, A New Technique to Transform a Fractal Low-Pass to Band-Pass Filter Using a Simple Combination of Defected Ground Structure (DGS) and Gap Capacitive (German), Radar, Communication and Measurement (RADCOM 2011), Helmut-Schmidt-Universität/Universität der Bundeswehr, Hamburg, April 6 - 7, 2011.



  • There are currently no refbacks.

© Copyright 2007-2016 JMOe Brazilian Microwave and Optoelectronics Society (SBMO) and Brazilian Society of Electromagnetism (SBMag)