A Compact UWB Filter with Notched Band and Suppressed Stopband Using DGS

Abstract

A microstrip-based Ultra-Wideband Bandpass Alter with a controllable notch and suppressed stopband is proposed. Dumbbell-shaped defected ground structure (DGS) etched in the ground and the double equilateral-U (DEU) DGS units under the input and output feeding lines provide the controllable notch and suppressed stopband, respectively. For optimum design of both the DGS (Dumbbell and DEU), a notch at WLAN frequency of 5.8 GHz and simultaneous stopband till 18 GHz is reported. Experimental results are in favor of the simulated data.

Keywords:

• Bandpass filter
• Defected ground structure
• Microstrip
• Suppressed stopband
• Ultra-wideband

Additional information

Notes on contributors

Abu Nasar Ghazali

Abu Nasar Ghazali received his B.Tech degree in Electronics & Communication Engineering from SRM University, Chennai, India in 2008 and M.E degree in Microwave Engineering from Birla Institute of Technology (BIT) Mesra, India in 2010 where he was a GATE scholar. He worked as an Assistant Professor in the Dept. of ECE at the Manav Rachna College of Engineering, Haryana, in 2010 and is currently a Assistant Professor at the BIT Mesra, Patna campus, India, where he is working towards his Ph.D. His main research interests are UWB filters, Defected Ground Structures, Microstrip filters and Microwave circuit components. E-mail: [email protected]

Srikanta Pal

Srikanta Pal received his B.Tech degree in Electronics & Communication Engineering from NIT Warangal, India and M.Tech degree in Microwave Engineering from Jadavpur University, India in 1990 and 1992 respectively. From 1992–2000 he was with the R&D Antenna Lab of the Bharat Electronics Limited (BEL). In 2001 he joined the Oxford University as a Research Associate where he worked towards his Ph.D. on HTS Microwave Filters, which he completed in 2003. From 2003–2005 he was a visiting Faculty in the Centre for Advanced Research in Electronics (CARE) Dept. at the IIT Delhi, India. In 2005 he joined the Dept. of Electronics and Computer Engineering at the IIT Roorkee, India, as an Assistant Professor. He joined the Emerging Devices Technology centre at the Birmingham University as a Post Doctorate fellow in 2006 where he designed a HTS filter which is currently installed in the world’s largest Telescope, Green Bank Telescope (GBT), West Virginia, USA. In 2008 he joined the ECE Dept. at the Author: Mr. Abu nasar ghazali. E-mail: [email protected]