Conclusions And References
In summary, a new quasi-Yagi DGS LPF was developed and offers excellent performance both within its passband and throughout its stopband. The use of a meander feedline helps improve passband and stopband performance compared to a filter without the meander feedline. The novel quasi-Yagi resonator made it easier to control resonant frequency without extra devices, contributing to the compact size of the filter structure. In validation of the design approach used for the quasi-Yagi LPF, the measured results agreed closely with computer simulations of the filter’s performance.
Ahmed Boutejdar, Engineer
Abbas Omar, Engineer
Edmund Burte, Engineer
Microwave and Communication Engineering Institute, University of Magdeburg, Magdeburg, 39106, Germany.
The authors wish to thank the German Research Society (DFG) for financial support. The authors are also grateful to Microwaves & RF Technical Contributor Jack Browne for his assistance and cooperation, and to Mr. Harald Dempewolf, Laboratory Manager of the Institute for Electronics, Signal Processing, and Communication (IESK) at the University of Magdeburg, Germany, for his help and support.
1. A. Dal, J.S. Park, C.S. Kim, J. Kim, Y. Qian, and T. Itoh, “A design of the low-pass filter using the novel microstrip defected ground structure,” IEEE Transactions on Microwave Theory & Techniques, Vol. 49, May 2001, pp. 86-93.
2. A. Boutejdar, A. Batmanov, A. Elsherbini, A.S. Omar, and E. Burte, “Design of Compact Tunable Band-Pass Filter Using J-Inverter and Quasi-Fractal Defected Ground Structure (DGS),” Proceedings of the EUROEM European Electromagnetic 2008, Lausanne, Switzerland, July 21-25, 2008.
3. J.S. Kuo and K.L. Wong, “A Compact Microstrip Antenna with Meandering Slots in the Ground Plane,” Microwave and Optical Technology Letters, Vol. 29, No. 2, April 20 2001, pp. 95-97.
4. H. Liu, Z. Li, and J. Mao, “Harmonic suppression with photonic bandgap and DGS for a microstrip patch antenna,” IEEE Microwave & Wireless Components Letters, Vol. 15, No. 2, February 2005, pp. 55-56.
5. J.-S. Lim, H.-S. Kim, J.S. Park, and S. Nam, “A power amplifier with efficiency improved using defected ground structure,” IEEE Microwave & Wireless Components Letters, Vol. 11, No. 4, April 2001, pp. 170-172.
6. A. Boutejdar, M. Makkey, A. Elsherbini, and A. Omar, “Design of compact stop-band extended microstrip low-pass filters by employing mutual coupled square shaped defected ground structures,” Microwave & Optical Technology Letters, Vol 50, No. 4, April 2008, pp. 1107-1111.
7. A. Boutejdar, A. Rahman, A. Batmanov, A. Omar, and E. Burte, “Miniaturized Band-Stop Filter Based on Multilayer- Technique and New Coupled Octagonal DGS With Interdigital Capacitor,” Microwave & Optical Technology Letters, Vol.52, No. 3, March 2010, pp. 510-514.
8. C. Kim, J.S. Park, A. Dal, and J. Kim, “A novel 1-D periodic defected ground structure for planar circuits,” IEEE Microwave Guided Wave Letters, Vol. 10, April 2000, pp. 131-133.
9. A. Boutejdar, A. Batmanov, and A.S. Omar, “A compact bandstop/bandpass filter using a narrow gap capacitive as j-inverter and new octagonal defected ground structure,” 3rd European Conference on Antennas and Propagation, EuCAP 2009, March 2009, Berlin, Germany.
10. Ahmed Boutejdar, Anatoly Batmanov, Abbas Omar, and Edmund P. Burte, “A miniature 3.1 GHz microstrip bandpass filter with suppression of spurious harmonics using multilayer technique and defected ground structure open-loop ring," (book chapter), in Ultrawideband, Short-Pulse Electromagnetics, Springer, New York, 2010, ISBN: 978-0-387-77844-0.
11. A. Abdel-Rahman, A.K. Verma, A. Boutejdar, and A.S. Omar, “Compact stub type microstrip bandpass filter using defected ground plane,” IEEE Microwave & Wireless Components Letters, Vol. 14, 2004, pp. 136-138.
12. Mohamed Al Sharkawy, Ahmed Boutejdar, Fatma Alhefnawi, and Omar Luxor, “Improvement of Compactness of Lowpass/Bandpass Filter Using A New Electromagnetic Coupled Crescent Defected Ground Structure (DGS) Resonators,” ACES Journal - The Applied Computational Electromagnetics, Issue: Vol. 25, No. 9, July 2010.
13. J.S. Hong and M.J. Lancaster, Microstrip Filters for RF/Microwave Applications, Wiley, New York, 2001.
14. Ahmed Boutejdar, Anatoliy Batmanov, Edmund Burte, and Abbas Omar, “Design of a New Bandpass Filter with Sharp Transition Band Using U-Defected Ground Structure (DGS) and Multilayer-Technique,” IET Microwave, Antennas and Propagation, Vol. 4, Issue 9, pp: 1415-1420, September 2010.
15. J.-S. Hong and M.J. Lancaster, “Theory and Experiment of Novel Microstrip Slow-Wave Open-Loop Resonator Filters,” IEEE Transactions on Microwave Theory & Techniques, Vol. 45, No. 12, December 1997, pp. 2358-2365.
16. Ahmed Boutejdar, Abbas Omar, and Edmund Burte, “Miniaturized Lowpass and Bandstop Filters Using Controlled Coupling of Open-Loop-Ring Defected Ground Structure (DGS),” Microwave and Optical Technology Letters, Vol. 52, No. 11, November 2010, p. 2575.
17. J.-S. Hong and M.J. Lancaster, “Cross-coupled microstrip hairpin-resonator filters,” IEEE Transactions on Microwave Theory & Techniques, Vol. 46, No. 1, January 1998, pp. 118-122.
| Download this article in .PDF format |
This file type includes high resolution graphics and schematics when applicable.