Table of Contents
International Journal of Microwave Science and Technology
Volume 2015, Article ID 101602, 7 pages
http://dx.doi.org/10.1155/2015/101602
Research Article

Design of a Novel Ultrawide Stopband Lowpass Filter Using a DMS-DGS Technique for Radar Applications

1Microwave Engineering Department, University of Magdeburg, 39106 Magdeburg, Germany
2Electronic and Communication Engineering Department, Minia University, Minia 61519, Egypt
3Micro and Sensor Department, University of Magdeburg, 39106 Magdeburg, Germany

Received 18 June 2015; Accepted 31 August 2015

Academic Editor: Giancarlo Bartolucci

Copyright © 2015 Ahmed Boutejdar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel wide stopband (WSB) low pass filter based on combination of defected ground structure (DGS), defected microstrip structure (DMS), and compensated microstrip capacitors is proposed. Their excellent defected characteristics are verified through simulation and measurements. Additionally to a sharp cutoff, the structure exhibits simple design and fabrication, very low insertion loss in the pass band of 0.3 dB and it achieves a wide rejection bandwidth with overall 20 dB attenuation from 1.5 GHz up to 8.3 GHz. The compact low pass structure occupies an area of (0.40  × 0.24) where = 148 mm is the waveguide length at the cut-off frequency 1.1 GHz. Comparison between measured and simulated results confirms the validity of the proposed method. Such filter topologies are utilized in many areas of communications systems and microwave technology because of their several benefits such as small losses, wide reject band, and high compactness.